The relationship between psychology practice and complementary medicine in Australia: Psychologists' demographics and practice characteristics regarding type of engagement across a range of complementary medicine modalities.

INTRODUCTION: Many people with mental health problems utilise a range of complementary medicine (CM) practitioners, products, and practices. Psychologists are likely to consult with clients who are seeking and using CM, in some form, as part of their wider mental health treatment. The aim of this research is to determine how much, and in what ways, Australian psychologists recommend CM products and/or practices, and/or initiate referrals to CM practitioners as part of their clinical practice and to explore if these behaviours have any association with the characteristics of the psychologist or their wider practice. METHODS: Survey data was collected from psychologists in clinical practice who self-selected to participate between February and April 2021. Participation in the study was via an online 79-item questionnaire exploring core aspects of CM engagement in psychology clinical practice. RESULTS: Amongst the 202 psychologists who completed the survey, mind/body approaches (90.5%) were the most recommended CM and cultural/spiritual approaches the least recommended CM (7.5%). Participants also reported referring to CM practitioners with naturopaths the most common focus of their referrals (57.9%) and cultural and spiritual practitioners the least common focus of their referrals (6.69%). Our analysis shows the demographic and practice characteristics of a psychologist are generally not predictors of a psychologist's engagement with CM in their clinical practice. CONCLUSIONS: Substantial numbers of psychologists recommend CM products and practices and/or refer clients to CM practitioners. Alongside subjecting CM interventions for mental health to an evidence-base assessment, the broader discipline of psychology needs to also consider psychologist engagement with CM in clinical practice in order to help ensure cultural-sensitivity, client safety and client choice.

Notas para decolonizar os estudos transpessoais no brasil: contribuições do pluriperspectivismo participativo / Notes for decolonizing transpersonal studies in brazil: contributions of participatory pluriperspectivism / Apuntes para la decolonización de los estudios transpersonales en brasil: aportes del pluriperspectivismo participativo

O campo dos estudos transpessoais tem avançado em diversas áreas no Brasil. Comemorou seus 40 anos com uma inserção ativa nas Instituições de Ensino Superior (IES) e uma ampliação de núcleos formativos e apoiadores de ensino, pesquisa e ações sociais, além de diálogos com o Sistema de Conselhos de Psicologia. Desafios são apresentados a partir do levantamento de uma série de questões importantes e ignoradas dentro da Psicologia Transpessoal no Brasil. Apresentamos o pluriperspectivismo participativo como possibilidade de decolonizar as matrizes eurocêntricas e estadunidenses, que dão suporte ao pensamento transpessoal brasileiro, buscando honrar nossas raízes históricas e incluir outras epistemologias e ontologias, que dão continuidade à crítica à lógica cartesiana moderna. Indicamos uma breve agenda de notas temáticas que carecem de um processo decolonizador no campo transpessoal: a) crítica às perspectivas de um pensamento hegemônico, em termos globais por meio da dominação Norte-Sul ou no campo das relações sociais; b) revisão das formas de "centrocentrismo"; c) questionamento da noção de universalismo das ciências e da ética; d) aprofundamento da análise crítica da supremacia restritiva da racionalidade formal técnico-científica em relação às formas de subjetividade, de vivências holísticas e integradoras e de valorização do corpo; e) revisão da noção de sujeito moderno desprovida da cocriação do humano com a comunidade, a história, a natureza e o cosmos.(AU)

The field of transpersonal studies has advanced in several areas in Brazil. It celebrated its 40th anniversary with an active insertion in Higher Education Institutions (HEI) and an expansion of training centers and supporters of teaching, research, and social actions, in addition to dialogues with the System of Councils of Psychology. Challenges are presented based on a survey of a series of important and ignored issues within Transpersonal Psychology in Brazil. We present participatory pluriperspectivism as a possibility to decolonize the Eurocentric and North American matrices that support Brazilian transpersonal thought, seeking to honor our historical roots and include other epistemologies and ontologies, which continue the critique of modern Cartesian logic. We indicate a brief agenda of thematic notes that lack a decolonizing process in the transpersonal field: a) criticism of the perspectives of a hegemonic thought, whether in global terms via North-South domination or in the field of social relations; b) review of the forms of "centrocentrism"; c) questioning of the notion of universalism of science and ethics; d) deepening of the critical analysis of the restrictive supremacy of the technical-scientific formal rationality in relation to the forms of subjectivity, of holistic and integrative experiences, and of valuing the body; e) review of the notion of the modern subject devoid of the co-creation of the human with the community, the history, the nature, and the cosmos.(AU)

El campo de los estudios transpersonales ha avanzado en varias áreas de Brasil. Se celebró su 40.º aniversario con una inserción activa en Instituciones de Educación Superior (IES) y una ampliación de los centros de formación y promotores de la docencia, la investigación y la acción social, además de diálogos con el Sistema de Consejos de Psicología. Los desafíos se presentan a partir de una encuesta de una serie de temas importantes e ignorados dentro de la Psicología Transpersonal en Brasil. Presentamos el pluriperspectivismo participativo como una posibilidad para decolonizar las matrices eurocéntrica y americana, que sustentan el pensamiento transpersonal brasileño, buscando honrar nuestras raíces históricas e incluir otras epistemologías y ontologías que continúan la crítica de la lógica cartesiana moderna. Indicamos una breve agenda de apuntes temáticos que carecen de un proceso decolonizador en el campo transpersonal: a) crítica de las perspectivas de un pensamiento hegemónico, ya sea en términos globales a través del dominio Norte-Sur o en el campo de las relaciones sociales; b) revisión de las formas de "centrocentrismo"; c) cuestionamiento de la noción de universalismo de la ciencia y la ética; d) profundización del análisis crítico de la supremacía restrictiva de la racionalidad formal técnico-científica en relación a las formas de subjetividad, de experiencias holísticas e integradoras y de valoración del cuerpo; e) revisión de la noción de sujeto moderno desprovisto de la cocreación de lo humano con la comunidad, la historia, la naturaleza y el cosmos.(AU)

Complementary medicine in psychology practice: an analysis of Australian psychology guidelines and a comparison with other psychology associations from English speaking countries.

BACKGROUND: Psychologists, and their clients, are engaging with complementary medicine (CM). Increasing evidence for CM approaches, such as improved nutrition and St John's wort, has led to their inclusion in the Royal Australian New Zealand College of Psychiatrists clinical practice guidelines for mood disorders. This research aims to determine in what ways, and to what extent, Australian psychology regulatory bodies and associations consider CM relevant to psychology practice. Specifically, how these regulatory bodies and professional association's ethical and practice guidelines engage with CM. METHODS: Documents from Australian regulatory bodies and professional associations, that relate to the governance or guidance of psychologists' clinical practice, were systematically searched for key terms relating to CM. RESULTS: There were no direct references to CM in the 58 ethical and practice guidelines reviewed. There was also no reference to the relevance of CM to ethnocultural groups, such as Aboriginal and Torres Strait Islander traditional healing practices. CONCLUSION: While other mental health care disciplines are working toward integrating CM, the discipline of psychology in Australia is not currently engaged in such developments. Given the exponential rise of CM use amongst those with mental health problems, psychology associations should consider developing resources and guidelines to assist psychologists in navigating CM in relation to clinical practice to help minimise risks, such as patient safety associated with concurrent CM use.

Temporal accuracy of gait after metronome practice.

Humans readily entrain their movements to a beat, including matching their gait to a prescribed tempo. Rhythmic auditory cueing tasks have been used to enhance stepping behavior in a variety of clinical populations. However, there is limited understanding of how temporal accuracy of gait changes over practice in healthy young adults. In this study, we examined how inter-step interval and cadence deviated from slow, medium, and fast tempos across steps within trials, across trials within blocks, and across two blocks that bookended a period of practice of walking to each tempo. Participants were accurate in matching the tempo at the slow and medium tempos, while they tended to lag behind the beat at the fast tempo. We also found that participants showed no substantial improvement across steps and trials, nor across blocks, suggesting that participants had a robust ability to entrain their gait to the specified metronome tempo. However, we did find that participants habituated to the prescribed tempo, showing self-paced gait that was faster than self-paced baseline gait after the fast tempo, and slower than self-paced baseline gait after the slow tempo. These findings might represent an "after-effect" in the temporal domain, akin to after-effects consistently shown in other sensorimotor tasks. This knowledge of how healthy participants entrain their gait to temporal cues may have important implications in understanding how clinical populations acquire and modify their gait in rhythmic auditory cueing tasks.

Modifications in fMRI Representation of Mental Rotation Following a 6 Week Graded Motor Imagery Training in Chronic CRPS Patients.

Complex regional pain syndrome (CRPS) is a neuropathic pain condition that is difficult to treat. For behavioral interventions, graded motor imagery (GMI) showed relevant effects, but underlying neural substrates in patient groups have not been investigated yet. A previous study investigating differences in the representation of a left/right hand judgment task demonstrated less recruitment of subcortical structures, such as the putamen, in CRPS patients than in healthy controls. In healthy volunteers, the putamen activity increased after a hand judgment task training. In order to test for longitudinal effects of GMI training, we investigated 20 CRPS patients in a wait-list crossover design with 3 evaluation time points. Patients underwent a 6 week GMI treatment and a 6 week waiting period in a randomized group assignment and treatment groups were evaluated by a blinded rater. When compared to healthy matched controls at baseline, CRPS patients showed less functional activation in areas processing visual input, left sensorimotor cortex, and right putamen. Only GMI treatment, but not the waiting period showed an effect on movement pain and hand judgment task performance. Regression analyses revealed positive associations of movement pain with left anterior insula activation at baseline. Right intraparietal sulcus activation change during GMI was associated with a gain in performance of the hand judgment task. The design used here is reliable for investigating the functional representation of the hand judgment task in an intervention study. PERSPECTIVE: Twenty chronic CRPS patients underwent a 6 week GMI intervention in a randomized wait-list crossover design. functional MRI was tested pre and post for the hand lateralization task which improved over GMI but not over WAITING. Performance gain was positively related to right parietal functional MRI activation.

Practice modality of motor sequences impacts the neural signature of motor imagery.

Motor imagery is conceptualized as an internal simulation that uses motor-related parts of the brain as its substrate. Many studies have investigated this sharing of common neural resources between the two modalities of motor imagery and motor execution. They have shown overlapping but not identical activation patterns that thereby result in a modality-specific neural signature. However, it is not clear how far this neural signature depends on whether the imagined action has previously been practiced physically or only imagined. The present study aims to disentangle whether the neural imprint of an imagined manual pointing sequence within cortical and subcortical motor areas is determined by the nature of this prior practice modality. Each participant practiced two sequences physically, practiced two other sequences mentally, and did a behavioural pre-test without any further practice on a third pair of sequences. After a two-week practice intervention, participants underwent fMRI scans while imagining all six sequences. Behavioural data demonstrated practice-related effects as well as very good compliance with instructions. Functional MRI data confirmed the previously known motor imagery network. Crucially, we found that mental and physical practice left a modality-specific footprint during mental motor imagery. In particular, activation within the right posterior cerebellum was stronger when the imagined sequence had previously been practiced physically. We conclude that cerebellar activity is shaped specifically by the nature of the prior practice modality.

Integrating complementary and alternative therapies into professional psychological practice: An exploration of practitioners' perceptions of benefits and barriers.

BACKGROUND AND PURPOSE: Although Complementary and Alternative Therapies (CATs) are currently incorporated into psychotherapy, scepticism remains among professional and practicing psychologists about integration of CATs into professional practice. This research explored perceived benefits and barriers to integrating CATs into psychology practice with individual clients. MATERIALS AND METHODS: We used a qualitative framework informed by Transpersonal Psychology to explore benefits and barriers to integrative psychology practice. We conducted semi-structured interviews with six practitioners trained or training in psychology and CATs and analysed verbatim transcripts using thematic analysis. RESULTS: Participants reported personal, career-based, and epistemological benefits and barriers to integrative psychology practice. Benefits were improved therapeutic relationships, specialisation options, and a time reflective psychology. Barriers included stigma and bias, regulations, and dominance of the scientist-practitioner model. Superordinate themes were holism, connectedness, and governance. CONCLUSION: Results activate conversation about the importance of a transpersonally oriented integrative psychological practice for the 21st century.

Acquisition and consolidation of sequential footstep movements with physical and motor imagery practice.

Sleep-dependent performance enhancement has been consistently reported after explicit sequential finger learning, even using motor imagery practice (MIP), but whether similar sleep benefits occur after explicit sequential gross motor learning with the lower limbs has been addressed less often. Here, we investigated both acquisition and consolidation processes in an innovative sequential footstep task performed either physically or mentally. Forty-eight healthy young participants were tested before and after physical practice (PP) or MIP on the footstep task, following either a night of sleep (PPsleep and MIPsleep groups) or an equivalent daytime period (PPday and MIPday groups). Results showed that all groups improved motor performance following the acquisition session, albeit the magnitude of enhancement in the MIP groups remained lower relative to the PP groups. Importantly, only the MIPsleep group further improved performance after a night of sleep, while the other groups stabilized their performance after consolidation. Together, these findings demonstrate a sleep-dependent gain in performance after MIP in a sequential motor task with the lower limbs but not after PP. Overall, the present study is of particular importance in the context of motor learning and functional rehabilitation.

Can we predict real-time fMRI neurofeedback learning success from pretraining brain activity?

Neurofeedback training has been shown to influence behavior in healthy participants as well as to alleviate clinical symptoms in neurological, psychosomatic, and psychiatric patient populations. However, many real-time fMRI neurofeedback studies report large inter-individual differences in learning success. The factors that cause this vast variability between participants remain unknown and their identification could enhance treatment success. Thus, here we employed a meta-analytic approach including data from 24 different neurofeedback studies with a total of 401 participants, including 140 patients, to determine whether levels of activity in target brain regions during pretraining functional localizer or no-feedback runs (i.e., self-regulation in the absence of neurofeedback) could predict neurofeedback learning success. We observed a slightly positive correlation between pretraining activity levels during a functional localizer run and neurofeedback learning success, but we were not able to identify common brain-based success predictors across our diverse cohort of studies. Therefore, advances need to be made in finding robust models and measures of general neurofeedback learning, and in increasing the current study database to allow for investigating further factors that might influence neurofeedback learning.

Network-based fMRI-neurofeedback training of sustained attention.

The brain regions supporting sustained attention (sustained attention network; SAN) and mind-wandering (default-mode network; DMN) have been extensively studied. Nevertheless, this knowledge has not yet been translated into advanced brain-based attention training protocols. Here, we used network-based real-time functional magnetic resonance imaging (fMRI) to provide healthy individuals with information about current activity levels in SAN and DMN. Specifically, 15 participants trained to control the difference between SAN and DMN hemodynamic activity and completed behavioral attention tests before and after neurofeedback training. Through training, participants improved controlling the differential SAN-DMN feedback signal, which was accomplished mainly through deactivating DMN. After training, participants were able to apply learned self-regulation of the differential feedback signal even when feedback was no longer available (i.e., during transfer runs). The neurofeedback group improved in sustained attention after training, although this improvement was temporally limited and rarely exceeded mere practice effects that were controlled by a test-retest behavioral control group. The learned self-regulation and the behavioral outcomes suggest that neurofeedback training of differential SAN and DMN activity has the potential to become a non-invasive and non-pharmacological tool to enhance attention and mitigate specific attention deficits.

Motor system activation during motor imagery is positively related to the magnitude of cortical plastic changes following motor imagery training.

Motor imagery (MI) is a cognitive motor process wherein a person consciously imagines themselves performing a movement. Previous transcranial magnetic stimulation (TMS) studies have demonstrated that physical and observational training can elicit neuroplastic adaptations in the cortical representation of movement. It has been shown that these cortical adaptations can also occur following MI training. These changes are thought to occur because of a training-dependent potentiation (i.e. increased excitability) of the trained movement representation. To test this hypothesis, the current experiment assessed the relationship between motor cortex excitability during MI and the magnitude of motor cortical adaptations following MI training. Prior to training, single-pulse TMS was used to determine the dominant direction of TMS-evoked thumb movements. The pre/post-training change in the direction of TMS-evoked thumb movements as well as the change in the first peak velocity of these thumb movements was used as an indication of the magnitude of adaptation following MI training. During the training session, participants imagined themselves moving their thumb in the opposite direction of the pre-determined dominant direction. Single-pulse TMS was also used to determine the amplitude of motor evoked potentials (MEPs) during imagined thumb movements. A strong positive relationship was found between MEP amplitude during MI of thumb movements and both measures of motor cortical adaptation following MI training. These results support the hypothesis that activation of the corticospinal motor system during MI of movements is related to the magnitude of motor cortical adaptations following MI training.

Temporal Deployment of Attention by Mental Training: an fMRI Study.

In this study, we employed a visuo-motor imagery task of alertness as a mental training to examine temporal processing of motor responses within healthy young adults. Participants were divided into two groups (group 1; n = 20 who performed the mental training before the real physical task and a control group who performed the physical task without mental training). We vary the time interval between the imperative stimulus and the preceding one (fore-period) in which temporal preparation and arousal increase briefly. Our behavioural results provide clear evidence that mental training reinforces both temporal preparation and arousal, by shortening reaction time (RT), especially for the shortest fore-periods (FP) within exogenous "FP 250 ms" (p = 0.008) and endogenous alertness "FP 650 ms" (p = 0.001). We investigated how the brain controls such small temporal changes. We focus our neural hypothesis on three brain regions: anterior insula, dorsolateral prefrontal cortex, and anterior cingulate cortex and three putative circuits: one top-down (from dorsolateral prefrontal cortex to anterior cingulate cortex) and two bottom-up (from anterior insula to dorsolateral prefrontal cortex and anterior cingulate cortex). In fMRI, effective connectivity is strengthened during exogenous alertness between anterior insula and dorsolateral prefrontal cortex (p = 0.001), between anterior insula and cingulate cortex (p = 0.01), and during endogenous alertness between dorsolateral prefrontal cortex and anterior cingulate cortex (p = 0.05). We suggest that attentional reinforcement induced by an intensive and short session of mental training induces a temporal deployment of attention and allow optimizing the time pressure by maintaining a high state of arousal and ameliorating temporal preparation.

Acute stress affects implicit but not explicit motor imagery: A pilot study.

Motor imagery (MI) is the capacity to mentally perform one or a set of movements without concomitant overt action. MI training has been show to enhance the subsequent motor performance. While the benefits of MI to manage stress have been extensively documented, the reverse impact of stress on MI received far less attention. The present study thus aimed to evaluate whether acute stress might influence MI abilities. Thirty participants were assigned either to a stress or a control group. The Socially Evaluated Cold Pressor Test (SECPT) was used to induce stress, with heart rate, electrodermal activity, salivary cortisol, and self-report perceived levels of stress being monitored during the experiment. Stress induction was followed by both implicit (laterality judgment) and explicit (sequential pointing) MI tasks. Main results showed a deleterious impact of stress on implicit MI, while explicit MI was not altered. These exploratory findings provide a deeper understanding of stress effects on cognition, and practically support that under stressful conditions, as during a sport competition or rehabilitation contexts, explicit MI should be prioritized.

Real-time biofeedback integrated into neuromuscular training reduces high-risk knee biomechanics and increases functional brain connectivity: A preliminary longitudinal investigation.

Prospective evidence indicates that functional biomechanics and brain connectivity may predispose an athlete to an anterior cruciate ligament injury, revealing novel neural linkages for targeted neuromuscular training interventions. The purpose of this study was to determine the efficacy of a real-time biofeedback system for altering knee biomechanics and brain functional connectivity. Seventeen healthy, young, physically active female athletes completed 6 weeks of augmented neuromuscular training (aNMT) utilizing real-time, interactive visual biofeedback and 13 served as untrained controls. A drop vertical jump and resting state functional magnetic resonance imaging were separately completed at pre- and posttest time points to assess sensorimotor adaptation. The aNMT group had a significant reduction in peak knee abduction moment (pKAM) compared to controls (p = .03, d = 0.71). The aNMT group also exhibited a significant increase in functional connectivity between the right supplementary motor area and the left thalamus (p = .0473 after false discovery rate correction). Greater percent change in pKAM was also related to increased connectivity between the right cerebellum and right thalamus for the aNMT group (p = .0292 after false discovery rate correction, r2  = .62). No significant changes were observed for the controls (ps > .05). Our data provide preliminary evidence of potential neural mechanisms for aNMT-induced motor adaptations that reduce injury risk. Future research is warranted to understand the role of neuromuscular training alone and how each component of aNMT influences biomechanics and functional connectivity.

Protective effects of testing across misinformation formats in the household scene paradigm.

Many studies have demonstrated retrieval-enhanced suggestibility (RES), in which taking an initial recall test after witnessing an event increases suggestibility to subsequent misinformation introduced via a narrative. Recently, however, initial testing has been found to have a protective effect against misinformation introduced via cued-recall questions. We examined whether misinformation format (narrative vs. cued-recall questions) yields a similar dissociation in a paradigm that, to date, has consistently yielded a protective effect of testing (PET). After studying photos of household scenes (e.g., kitchen), some participants took an initial recall test. After a 48-hr delay, items not presented in the scenes (e.g., knives/plates) were suggested either via narrative or questions. Regardless of the misinformation format, we found a PET on both initial-test-conditionalised free recall and source-monitoring tests. However, initial testing also yielded memory costs, such that suggested items reported on the initial test were likely to persist on a final recall test. Thus, initial testing can protect against suggestibility, but can also precipitate memory errors when intrusions emerge on an initial test.

Effect of fine and gross motor training or motor imagery, delivered via novel or routine modes, on cognitive function.

There is extensive literature linking motor activity to cognitive effects at various stages in life, promoting both development and the reduction of aging associated pathologies. It is unclear whether the benefits of this activity on the cognitive level are associated with brain functions that are necessary for their performance or recurrence of activity or type of activity itself. The aim of this study was to evaluate whether the type of motor activity (fine, gross, and motor imagery) in two modes (novel and routine) can affect cognitive functions such as attention, executive functions, and praxis in college students. A 2 × 3 factorial design with repeated measures was used without a control group and pre- and post-training evaluation. Fifty-three young people (14 men and 39 women) participated, with mean age of 18.94 years (SD = 1.61 years) and were divided into six groups. Each of the groups performed relevant training 20 minutes per day for five days depending on the group. Measures were taken pre and post-training for attention tests, attention span, working memory, visual constructive skills, procedural memory, and motor skills. The results show a "learning effect" from the exposure to the tests in measurements after training. It was also found that between groups, there is a difference in some of the variables of procedural memory (number of errors) and working memory. More extensive training could better reflect the effects of the training, and longitudinal evaluation could show the rate of change of functions. The main clinical implication could be the evaluation of training programs for recovery and motor training in cerebral plasticity having effect on the cognitive aspects.

Cerebral haemodynamics during motor imagery of self-feeding with chopsticks: differences between dominant and non-dominant hand.

Purpose: Motor imagery is defined as a dynamic state during which a subject mentally simulates a given action without overt movements. Our aim was to use near-infrared spectroscopy to investigate differences in cerebral haemodynamics during motor imagery of self-feeding with chopsticks using the dominant or non-dominant hand.Materials and methods: Twenty healthy right-handed people participated in this study. The motor imagery task involved eating sliced cucumber pickles using chopsticks with the dominant (right) or non-dominant (left) hand. Activation of regions of interest (pre-supplementary motor area, supplementary motor area, pre-motor area, pre-frontal cortex, and sensorimotor cortex was assessed.Results: Motor imagery vividness of the dominant hand tended to be significantly higher than that of the non-dominant hand. The time of peak oxygenated haemoglobin was significantly earlier in the right pre-frontal cortex than in the supplementary motor area and left pre-motor area. Haemodynamic correlations were detected in more regions of interest during dominant-hand motor imagery than during non-dominant-hand motor imagery.Conclusions: Haemodynamics might be affected by differences in motor imagery vividness caused by variations in motor manipulation.

Effects of Different Ratios of Physical and Mental Practice on Postural Control Improvement.

Mental practice (MP) is a reliable alternative or complement to physical practice (PP) for the training of postural control. We address how MP should ideally be combined with PP. Participants were assigned to four experimental groups where MP/PP ratios during training varied from 0 to 100%. Performance improved only for demanding postural adjustments, regardless of MP/PP ratio, and learning was partially consolidated after a night of sleep. Findings reinforce the relevance of MP for the training of weight shifting and further suggest that MP alone can be as efficient as PP for the learning of certain complex postural adjustments.

Acquisition and consolidation of implicit motor learning with physical and mental practice across multiple days of anodal tDCS.

BACKGROUND: Acquisition and consolidation of a new motor skill occurs gradually over long time span. Motor imagery (MI) and brain stimulation have been showed as beneficial approaches that boost motor learning, but little is known about the extent of their combined effects. OBJECTIVE: Here, we aimed to investigate, for the first time, whether delivering multiple sessions of transcranial direct current stimulation (tDCS) over primary motor cortex during physical and MI practice might improve implicit motor sequence learning in a young population. METHODS: Participants practiced a serial reaction time task (SRTT) either physically or through MI, and concomitantly received either an anodal (excitatory) or sham stimulation over the primary motor cortex during three successive days. The effect of anodal tDCS on the general motor skill and sequence specific learning were assessed on both acquisition (within-day) and consolidation (between-day) processes. We further compared the magnitude of motor learning reached after a single and three daily sessions of tDCS. RESULTS: The main finding showed that anodal tDCS boosted MI practice, but not physical practice, during the first acquisition session. A second major result showed that compared to sham stimulation, multiple daily session of anodal tDCS, for both types of practice, resulted in greater implicit motor sequence learning rather than a single session of stimulation. CONCLUSIONS: The present study is of particular importance in the context of rehabilitation, where we postulate that scheduling mental training when patients are not able to perform physical movement might beneficiate from concomitant and consecutive brain stimulation sessions over M1 to promote functional recovery.

Modulation of Event-related Potentials of Visual Discrimination by Meditation Training and Sustained Attention.

The ability to discriminate among goal-relevant stimuli tends to diminish when detections must be made continuously over time. Previously, we reported that intensive training in shamatha (focused-attention) meditation can improve perceptual discrimination of difficult-to-detect visual stimuli [MacLean, K. A., Ferrer, E., Aichele, S. R., Bridwell, D. A., Zanesco, A. P., Jacobs, T. L., et al. Intensive meditation training improves perceptual discrimination and sustained attention. Psychological Science, 21, 829-839, 2010]. Here we extend these findings to examine how discrimination difficulty and meditation training interact to modulate event-related potentials of attention and perceptual processing during vigilance. Training and wait-list participants completed a continuous performance task at the beginning, middle, and end of two 3-month meditation interventions. In the first intervention (Retreat 1), the continuous performance task target was adjusted across assessments to match training-related changes in participants' perceptual capacity. In the second intervention (Retreat 2), the target was held constant across training, irrespective of changes in discrimination capacity. No training effects were observed in Retreat 1, whereas Retreat 2 was associated with changes in the onset of early sensory signals and an attenuation of within-task decrements at early latencies. In addition, changes at later stimulus processing stages were directly correlated with improvements in perceptual threshold across the second intervention. Overall, these findings demonstrate that improvements in perceptual discrimination can modulate electrophysiological markers of perceptual processing and attentional control during sustained attention, but likely only under conditions where an individual's discrimination capacity is allowed to exceed the demand imposed by the difficulty of a visual target. These results contribute to basic understanding of the dependence of perceptual processing and attentional control to contextual demands and their susceptibility to directed mental training.