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1.
J Cogn Neurosci ; 35(1): 44-48, 2022 12 01.
Artículo en Inglés | MEDLINE | ID: mdl-36306261

RESUMEN

The transition to principal investigator (PI), or lab leader, can be challenging, partially due to the need to fulfil new managerial and leadership responsibilities. One key aspect of this role, which is often not explicitly discussed, is creating a supportive lab environment. Here, we present ten simple rules to guide the new PI in the development of their own positive and thriving lab atmosphere. These rules were written and voted on collaboratively, by the students and mentees of Professor Mark Stokes, who inspired this piece.

2.
Medicine (Baltimore) ; 98(27): e16274, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31277153

RESUMEN

This study aimed to investigate the recognition rate of psychological distress in general hospitals in China and to examine the main associated factors.Using a cross-sectional study design, the questionnaires were administered to a total of 1329 inpatients from a tertiary hospital. The Patient Health Questionnaire-9 (PHQ-9), the Generalized Anxiety Disorder 7-item scale (GAD-7), the Patient Health Questionnaire (PHQ-15) and the Whiteley-7 (WI-7) were used to assess patients' mental health status. Two subjective questions were used to identify the awareness of psychological distress in patients and doctors.The frequency of psychological distress measured by the questionnaires was high in our sample (53.4%). However, the recognition rates of both patients (34.9%) and by doctors (39.1%) was low. The concordance rate between patients and doctors of whether the patient had psychological distress or not was extremely poor (Kappa = 0.089, P = .001). Factors associated with the poor concordance rate included patients' annual household income and clinically significant self-reported symptoms of anxiety and hypochondriasis.The recognition rate of psychological distress was underestimated and this may be related to a lack of awareness of mental disturbances and patients' low annual household income.


Asunto(s)
Ansiedad/epidemiología , Hospitales Generales/estadística & datos numéricos , Médicos/psicología , Calidad de Vida , Estrés Psicológico/epidemiología , Carga de Trabajo/psicología , Adulto , Anciano , Ansiedad/etiología , Ansiedad/psicología , China/epidemiología , Estudios Transversales , Femenino , Humanos , Incidencia , Masculino , Persona de Mediana Edad , Escalas de Valoración Psiquiátrica , Índice de Severidad de la Enfermedad , Factores Socioeconómicos , Estrés Psicológico/complicaciones , Encuestas y Cuestionarios
4.
Psychiatry Res ; 270: 822-830, 2018 12.
Artículo en Inglés | MEDLINE | ID: mdl-30551331

RESUMEN

Mental health-related stigma is common and inhibits help-seeking. It triggers fears of devaluation and can add to the burden of a mental disorder. To counter the consequences of mental health-related stigma, its sound assessment is crucial. Therefore, we developed a new measure, the Stigma-9 Questionnaire (STIG-9), and evaluated its psychometric properties and applicability in patients with mental disorders. Item development was based on the modified labelling theory, psychometric reasoning, and discussion with focus groups including patients and clinicians. Data from 919 consecutive patients from an outpatient clinic for mental disorders (69% female, mean age 41 (SD = 14) years) was used to psychometrically evaluate the measure. The STIG-9 consists of nine items assessing cognitive, behavioural and affective aspects of perceived mental health-related stigma. Higher scores indicate stronger expectations of negative societal beliefs, feelings, and behaviours towards 'mentally ill' people. Confirmatory factor analysis revealed a single factor structure. The scale showed high internal consistency. Male gender, social impairment and higher levels of psychopathology corresponded with higher STIG-9 scores. The STIG-9 is a new, theory-grounded, patient-oriented and psychometrically promising self-report measure of perceived mental health-related stigma. It is brief, comprehensive, and appears to be well accepted by patients with mental disorders.


Asunto(s)
Cultura , Trastornos Mentales/psicología , Psicometría/estadística & datos numéricos , Estigma Social , Encuestas y Cuestionarios , Adulto , Anciano , Instituciones de Atención Ambulatoria , Femenino , Alemania , Humanos , Masculino , Persona de Mediana Edad , Aceptación de la Atención de Salud/psicología , Autoinforme
5.
Clin Psychol Psychother ; 25(6): 754-764, 2018 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-29971880

RESUMEN

BACKGROUND: A high proportion of cardiac patients suffers from depression, which is an antecedent for suicidal ideation. This study identifies clinical vulnerabilities for suicidal ideation in cardiac patients. METHODS: The primary outcome of the study was severity of suicidal ideation as measured with the Patient Health Questionnaire (PHQ-9) item No. 9. Covariates were demographics, cardiac characteristics (i.e., Canadian Cardiovascular Society angina rating of chest pain and New York Heart Association rating of shortness of breath), depression (PHQ-8,i.e., PHQ-9 minus item No. 9), anxiety (Generalized Anxiety Disorder-7, GAD-7), somatic symptoms (PHQ-15), illness perception (Brief-Illness Perception Questionnaire), and health-related quality of life (EuroQol-5D, EQ 5D). RESULTS: Data from 1,976 patients were analysed. At least 14% (95% CI [12%, 16%]) of patients indicated suicidal ideations within the last 2 weeks. Bivariate analyses yielded associations between suicidal ideation and higher levels of depression severity, anxiety severity, somatic symptom burden, chest pain, shortness of breath, negative illness perceptions, reduced health-related quality of life, and a higher probability of living alone (all p < 0.001). A multivariable ordinal regression revealed depression severity and anxiety severity to show the highest associations with suicidal ideation (ORPHQ-8  = 1.22, p < 0.001; ORGAD-7  = 1.09, p < 0.001). Having a defibrillator implant was associated with a lower probability of suicidal ideation (OR = 0.27, p = 0.017). CONCLUSIONS: This study identified several clinical vulnerabilities of suicidal ideation. The results stress the importance of screening for suicidal ideation in clinical practice.


Asunto(s)
Enfermedad Coronaria/epidemiología , Trastorno Depresivo/diagnóstico , Trastorno Depresivo/epidemiología , Hipertensión/epidemiología , Ideación Suicida , Encuestas y Cuestionarios , Anciano , Comorbilidad , Enfermedad Coronaria/psicología , Estudios Transversales , Trastorno Depresivo/psicología , Femenino , Alemania/epidemiología , Humanos , Hipertensión/psicología , Masculino , Prevalencia , Factores de Riesgo , Índice de Severidad de la Enfermedad
6.
Trials ; 18(1): 506, 2017 Oct 30.
Artículo en Inglés | MEDLINE | ID: mdl-29084595

RESUMEN

BACKGROUND: Colorectal cancer (CRC) is the most common cancer affecting both men and women. Survivors of CRC often experience various physical and psychological effects arising from CRC and its treatment. These effects may last for many years and adversely affect QoL, and they may not be adequately addressed by standard specialist-based follow-up. Optimal management of these effects should harness the expertise of both primary care and specialist care. Shared models of care (involving both the patient's primary care physician [PCP] and specialist) have the potential to better support survivors and enhance health system efficiency. METHODS/DESIGN: SCORE (Shared care of Colorectal cancer survivors) is a multisite randomised controlled trial designed to optimise and operationalise a shared care model for survivors of CRC, to evaluate the acceptability of the intervention and study processes, and to collect preliminary data regarding the effects of shared care compared with usual care on a range of patient-reported outcomes. The primary outcome is QoL measured using the European Organisation for Research and Treatment of Cancer QLQ-C30 questionnaire. Secondary outcomes are satisfaction with care, unmet needs, continuity of care and health resource use. The shared care model involves replacement of two routine specialist follow-up visits with PCP visits, as well as the provision of a tailored survivorship care plan and a survivorship booklet and DVD for CRC survivors. All consenting patients will be randomised 1:1 to either shared care or usual care and will complete questionnaires at three time points over a 12-month period (baseline and at 6 and 12 months). Health care resource use data will also be collected and used to evaluate costs. DISCUSSION: The evaluation and implementation of models of care that are responsive to the holistic needs of cancer survivors while reducing the burden on acute care settings is an international priority. Shared care between specialists and PCPs has the potential to enhance patient care and outcomes for CRC survivors while offering improvements in health care resource efficiency. If the findings of the present study show that the shared care intervention is acceptable and feasible for CRC survivors, the intervention may be readily expanded to other groups of cancer survivors. TRIAL REGISTRATION: Australian New Zealand Clinical Trials Registry, ACTRN12617000004369p . Registered on 3 January 2017; protocol version 4 approved 24 February 2017.


Asunto(s)
Neoplasias Colorrectales/terapia , Prestación Integrada de Atención de Salud , Grupo de Atención al Paciente , Calidad de Vida , Supervivientes de Cáncer/psicología , Neoplasias Colorrectales/fisiopatología , Neoplasias Colorrectales/psicología , Continuidad de la Atención al Paciente , Humanos , Oncólogos , Satisfacción del Paciente , Médicos de Atención Primaria , Proyectos de Investigación , Encuestas y Cuestionarios , Factores de Tiempo , Resultado del Tratamiento , Victoria
7.
PLoS One ; 12(8): e0182949, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-28837582

RESUMEN

OBJECTIVE: Knowing which specific verbal techniques "good" therapists use in their daily work is important for training and evaluation purposes. In order to systematize what is being practiced in the field, our aim was to empirically identify verbal techniques applied in psychodynamic sessions and to differentiate them according to their basic semantic features using a bottom-up, qualitative approach. METHOD: Mixed-Method-Design: In a comprehensive qualitative study, types of techniques were identified at the level of utterances based on transcribed psychodynamic therapy sessions using Qualitative Content Analysis (4211 utterances). The definitions of the identified categories were successively refined and modified until saturation was achieved. In a subsequent quantitative study, inter-rater reliability was assessed both at the level of utterances (n = 8717) and at the session level (n = 38). The convergent validity of the categories was investigated by analyzing associations with the Interpretive and Supportive Technique Scale (ISTS). RESULTS: The inductive approach resulted in a classification system with 37 categories (Psychodynamic Interventions List, PIL). According to their semantic content, the categories can be allocated to three dimensions: form (24 categories), thematic content (9) and temporal focus (4). Most categories showed good or excellent inter-rater reliability and expected associations with the ISTS were predominantly confirmed. The rare use of the residual category "Other" suggests that the identified categories might comprehensively describe the breadth of applied techniques. CONCLUSIONS: The atheoretical orientation and the clear focus on overt linguistic features should enable the PIL to be used without intensive training or prior theoretical knowledge. The PIL can be used to investigate the links between verbal techniques derived from practice and micro-outcomes (at the session level) as well as the overall therapeutic outcomes. This approach might enable us to determine to what extent the outcome of therapy is due to unintended or non-theoretically relevant techniques.


Asunto(s)
Personal de Salud , Psicoterapia Psicodinámica/métodos , Adulto , Femenino , Humanos , Masculino , Persona de Mediana Edad , Recursos Humanos
8.
Br J Psychiatry ; 210(2): 132-139, 2017 02.
Artículo en Inglés | MEDLINE | ID: mdl-27908896

RESUMEN

BACKGROUND: International guidelines advocate depression screening in patients with coronary heart disease (CHD) and other chronic illnesses, but evidence is lacking. AIMS: To test the differential efficacy of written patient-targeted feedback v. no written patient feedback after depression screening. METHOD: Patients with CHD or hypertension from three cardiology settings were randomised and screened for depression (ClinicalTrials.gov Identifier: NCT01879111). Compared with the control group, where only cardiologists received written feedback, in the intervention group both cardiologists and patients received written feedback regarding depression status. Depression severity was measured 1 month (primary outcome) and 6 months after screening. RESULTS: The control group (n = 220) and the patient-feedback group (n = 155) did not differ in depression severity 1 month after screening. Six months after screening, the patient-feedback group showed significantly greater improvements in depression severity and was twice as likely to seek information about depression compared with the control group. CONCLUSIONS: Patient-targeted feedback in addition to screening has a significant but small effect on depression severity after 6 months and may encourage patients to take an active role in the self-management of depression.


Asunto(s)
Enfermedad Coronaria , Depresión/diagnóstico , Retroalimentación , Hipertensión , Evaluación de Resultado en la Atención de Salud , Comorbilidad , Enfermedad Coronaria/epidemiología , Depresión/epidemiología , Depresión/fisiopatología , Femenino , Estudios de Seguimiento , Humanos , Hipertensión/epidemiología , Masculino , Persona de Mediana Edad , Autocuidado , Índice de Severidad de la Enfermedad
9.
PLoS One ; 11(5): e0156167, 2016.
Artículo en Inglés | MEDLINE | ID: mdl-27228158

RESUMEN

BACKGROUND: Major depression is common in coronary heart disease (CHD) but challenging to diagnose. Instead of focusing on the overall diagnosis of depression, base rates of depressive symptoms could facilitate screening and management of psychopathology in CHD. The present study investigates the frequency of individual depressive symptoms in CHD and their impact on cardiac and subjective health. METHODS: In total, 1337 in- and outpatients with CHD were screened for depressive symptoms with the Patient Health Questionnaire-9 (PHQ-9) at three different cardiac treatment sites. Tables stratified by age and gender were designed to illustrate base rates of depressive symptoms. Multiple regression analyses adjusted for sociodemographic and clinical data were conducted to test associations between individual depressive symptoms and quality of life as well impairment caused angina pectoris and dyspnea. RESULTS: During the last 14 days, more than half of patients reported a loss of energy (74.9%, 95% Confidence Interval (CI): 70.6-79.2), sleeping problems (69.4%, 95% CI: 64.9-74.0), loss of interest (55.7%, 95% CI: 50.8-60.7). In contrast, psychomotor change (25.6%, 95%CI: 21.3-30.0), feelings of failure (21.9%, 95%CI: 17.7-26.0), suicidal ideations (14.1%, 95%CI: 10.7-17.6) were less frequently reported. Depending on the outcome, only particular depressive symptoms were highly associated with low quality of life and impairment caused by angina pectoris and dyspnea. Loss of energy was the only depressive symptom that reliably predicted all three outcomes. CONCLUSIONS: Depressive symptoms in CHD are frequent but vary widely in terms of frequency. Findings underline the differential effects of individual depressive symptoms on cardiac health. Presented base rates of depressive symptoms offer clinicians a new way to judge the severity of individual depressive symptoms and to communicate individual PHQ-9 profiles with patients with respect to gender, age, cardiac symptoms and quality of life.


Asunto(s)
Enfermedad Coronaria/complicaciones , Trastorno Depresivo/etiología , Calidad de Vida , Anciano , Enfermedad Coronaria/psicología , Estudios Transversales , Trastorno Depresivo/psicología , Femenino , Estado de Salud , Humanos , Masculino , Persona de Mediana Edad , Perfil de Impacto de Enfermedad , Encuestas y Cuestionarios
10.
J Psychosom Res ; 80: 1-10, 2016 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-26721541

RESUMEN

OBJECTIVE: Despite their prevalence and impact on patients and the health care system, non-specific, functional, and somatoform disorders are underdiagnosed. This problem is especially problematic in primary care if we are moving towards an integrated care model. The objective of the current study was to identify and aggregate potential barriers to the diagnosis in primary care settings. METHODS: Our systematic review methodology followed a pre-published protocol and was registered in PROSPERO (CRD42013002540). We combined qualitative and quantitative data from studies identified in online databases and by hand searching of reference lists. Data were synthesized in a data-driven way using a grounded-theory approach. The level of evidence and assessment of bias for the final included studies was independently conducted. RESULTS: Data from n=177 full text publications were independently extracted and combined in a custom database. The final list of included studies was n=42. From these, a total of n=379 barriers were identified comprising 77 barrier-level codes, 16 thematic categories and five over-arching themes, i.e., patient-related, primary-care-practitioner related, doctor-patient interactional, situational, and conceptual and operational barriers. CONCLUSION: Given the thematic range of the identified barriers, the diagnostic process of non-specific, functional, and somatoform disorders in primary care is highly complex. Individual or practice-level interventions, as well as public awareness initiatives are needed to help address the diagnostic challenges. A multi-factorial understanding of symptoms with a biopsychosocial parallel diagnostic approach should be encouraged. More direct empirical investigations are also needed.


Asunto(s)
Atención Primaria de Salud , Trastornos Somatomorfos/diagnóstico , Humanos , Prevalencia , Trastornos Somatomorfos/terapia
11.
Psychosom Med ; 78(1): 5-12, 2016 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-26461855

RESUMEN

OBJECTIVE: To develop and validate a new self-report questionnaire for the assessment of the psychological features of Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition somatic symptom disorder. METHODS: The Somatic Symptom Disorder-B Criteria Scale (SSD-12) was developed in several steps from an initial pool of 98 items. The SSD-12 is composed of 12 items; each of the three psychological subcriteria is measured by four items. In a cross-sectional study, the SSD-12 was administered to 698 patients (65.8% female, mean [standard deviation] age = 38.79 [14.15] years) from a psychosomatic outpatient clinic. Item and scale characteristics as well as measures of reliability and validity were determined. RESULTS: The SSD-12 has good item characteristics and excellent reliability (Cronbach α = .95). Confirmatory factor analyses suggested that a three-factorial structure that reflects the three psychological criteria interpreted as cognitive, affective, and behavioral aspects (n = 663, Comparative Fit Index > 0.99, Tucker-Lewis Index > 0.99, Root Mean Square Error of Approximation = 0.06, 90% confidence interval = 0.01-0.08). SSD-12 total sum score was significantly associated with somatic symptom burden (r = 0.47, p < .001) and health anxiety (r = 0.71, p < .001), and moderately associated with general anxiety (r = 0.35, p < .001) and depressive symptoms (r = 0.22, p < .001). Patients with a higher SSD-12 psychological symptom burden reported higher general physical and mental health impairment and significantly higher health care use. CONCLUSIONS: The SSD-12 is the first self-report questionnaire that operationalizes the new psychological characteristics of Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition somatic symptom disorder. Initial assessment indicates that the SSD-12 has sufficient reliability and validity to warrant further testing in both research and clinical settings.


Asunto(s)
Trastornos Somatomorfos/diagnóstico , Encuestas y Cuestionarios , Evaluación de Síntomas , Adolescente , Adulto , Anciano , Anciano de 80 o más Años , Trastornos del Conocimiento/diagnóstico , Manual Diagnóstico y Estadístico de los Trastornos Mentales , Femenino , Humanos , Masculino , Trastornos Mentales/diagnóstico , Persona de Mediana Edad , Trastornos del Humor/diagnóstico , Reproducibilidad de los Resultados , Autoinforme , Trastornos Somatomorfos/psicología , Adulto Joven
12.
J Psychosom Res ; 78(4): 352-5, 2015 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-25498316

RESUMEN

OBJECTIVE: The Patient Health Questionnaire-15 (PHQ-15) is a frequently used questionnaire to assess somatic symptom burden. Recently, the Somatic Symptom Scale-8 (SSS-8) has been published as a short version of the PHQ-15. This study examines whether the instruments' psychometric properties and estimates of symptom burden are comparable. METHODS: Psychosomatic outpatients (N=131) completed the PHQ-15, the SSS-8 and other questionnaires (PHQ-9, GAD-7, WI-7, SF-12). Item characteristics and measures of reliability, validity, and symptom severity were determined and compared. RESULTS: The reliabilities of the PHQ-15 and SSS-8 were α=0.80 and α=0.76, respectively and both scales were highly correlated (r=0.83). The item characteristics were comparable. Both instruments showed the same pattern of correlations with measures of depression, anxiety, health anxiety and health-related quality of life (r=0.32 to 0.61). On both scales a 1-point increase was associated with a 3% increase in health care use. The percentile distributions of the PHQ-15 and the SSS-8 were similar. Using the same thresholds for somatic symptom severity (5, 10, and 15 points), both instruments identified nearly identical subgroups of patients with respect to health related quality of life. CONCLUSION: The PHQ-15 and the SSS-8 showed similar reliability and validity but the comparability of severity classifications needs further evaluation in other populations. Until then we recommend the use of the previously established thresholds. Overall, the SSS-8 performed well as a short version of the PHQ-15 which makes it preferable for assessment in time restricted settings.


Asunto(s)
Ansiedad/etiología , Costo de Enfermedad , Depresión/etiología , Pacientes Ambulatorios , Trastornos Psicofisiológicos/diagnóstico , Calidad de Vida , Encuestas y Cuestionarios/normas , Adulto , Anciano , Ansiedad/epidemiología , Depresión/epidemiología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Psicometría , Reproducibilidad de los Resultados
13.
J Cogn Neurosci ; 26(7): 1377-89, 2014 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-24456394

RESUMEN

In the current study, we tested whether representations in visual STM (VSTM) can be biased via top-down attentional modulation of visual activity in retinotopically specific locations. We manipulated attention using retrospective cues presented during the retention interval of a VSTM task. Retrospective cues triggered activity in a large-scale network implicated in attentional control and led to retinotopically specific modulation of activity in early visual areas V1-V4. Importantly, shifts of attention during VSTM maintenance were associated with changes in functional connectivity between pFC and retinotopic regions within V4. Our findings provide new insights into top-down control mechanisms that modulate VSTM representations for flexible and goal-directed maintenance of the most relevant memoranda.


Asunto(s)
Atención/fisiología , Sesgo , Memoria a Corto Plazo/fisiología , Vías Visuales/fisiología , Percepción Visual/fisiología , Adulto , Análisis de Varianza , Señales (Psicología) , Femenino , Humanos , Procesamiento de Imagen Asistido por Computador , Imagen por Resonancia Magnética , Masculino , Oxígeno/sangre , Reproducibilidad de los Resultados , Factores de Tiempo , Vías Visuales/irrigación sanguínea , Adulto Joven
14.
Syst Rev ; 2: 99, 2013 Nov 08.
Artículo en Inglés | MEDLINE | ID: mdl-24206625

RESUMEN

BACKGROUND: Somatoform-type disorders and functional medically unexplained symptoms are extremely common in primary care settings. These disorders, however, are consistently underdiagnosed and under-recognised which precludes effective treatment. Given that somatoform symptoms are associated with high impairment, healthcare costs and both physician and patient frustration, it is critical to improve early detection. The first step in improving patient care is to identify the current barriers which obstruct successful diagnosis to enable the design of targeted interventions. We aim to conduct a systematic review to identify the possible physician-, patient- and society-related factors and other practical constraints which may impede successful diagnosis. In the process, we will also be able to recognise the differences in methodological techniques, recommend potential avenues for future research and comment on the literature in this field as a whole. METHODS/DESIGN: We aim to conduct a systematic review of the relevant peer-reviewed literature published in English or German in the past 10 years in MEDLINE, EMBASE, PsycINFO and the Cochrane Database of Systematic Reviews. Additional studies may be identified from the reference lists of included studies. Title and abstract screening and data extraction from full text manuscripts will be conducted by two independent reviewers. Because we are including a combination of qualitative and quantitative studies, the review will provide a broad understanding of the current situation. Wherever possible, the method and reporting of the review will adhere to the guidelines outlined in the PRISMA statement and bias will be assessed using the Cochrane collaboration's recommendations. We envisage that data will be synthesised using a multilevel (qualitative and quantitative) approach which combines textual narrative and thematic analysis. Barriers will be categorised as modifiable or non-modifiable according to a conceptual framework. The review has been registered in an international registry of systematic reviews PROSPERO (CRD42013002540). DISCUSSION: We hope that this study will provide an insight into the barriers to diagnosis of somatoform-type disorders and the results can be used to target appropriate interventions to improve care for these patients.


Asunto(s)
Atención Primaria de Salud , Proyectos de Investigación , Trastornos Somatomorfos/diagnóstico , Revisiones Sistemáticas como Asunto , Humanos
15.
Psychol Sci ; 24(4): 550-6, 2013 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-23436786

RESUMEN

When a memory is forgotten, is it lost forever? Our study shows that selective attention can restore forgotten items to visual short-term memory (VSTM). In our two experiments, all stimuli presented in a memory array were designed to be equally task relevant during encoding. During the retention interval, however, participants were sometimes given a cue predicting which of the memory items would be probed at the end of the delay. This shift in task relevance improved recall for that item. We found that this type of cuing improved recall for items that otherwise would have been irretrievable, providing critical evidence that attention can restore forgotten information to VSTM. Psychophysical modeling of memory performance has confirmed that restoration of information in VSTM increases the probability that the cued item is available for recall but does not improve the representational quality of the memory. We further suggest that attention can restore discrete items to VSTM.


Asunto(s)
Atención/fisiología , Señales (Psicología) , Memoria a Corto Plazo/fisiología , Adulto , Humanos , Recuerdo Mental , Adulto Joven
16.
PLoS One ; 7(8): e41223, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-22905099

RESUMEN

Visual short-term memory (VSTM) is limited in the quantity and quality of items that can be retained over time. Importantly, these two mnemonic parameters interact: increasing the number of items in VSTM reduces the quality with which they are represented. Here, we ask whether this trade-off is under top-down control. Specifically, we test whether participants can strategically optimise the trade-off between quality and quantity for VSTM according to task demands. We manipulated strategic trade-off by varying expectations about the number of to-be-remembered items (Experiments 1-2) or the precision required for the memory-based judgement (Experiment 3). In a final experiment, we manipulated both variables in a complementary way to maximise the motivation to strategically control the balance between number and the quality of items encoded into VSTM. In different blocks, performance would benefit most either by encoding a large number of items with low precision or by encoding a small number of items with high precision (Experiment 4). In all experiments, we compared VSTM performance on trials matched for mnemonic demand, but within contexts emphasising the quality or quantity of VSTM representations. Across all four experiments, we found no evidence to suggest that participants use this contextual information to bias the balance between the number and precision of items in VSTM. Rather, our data suggest that the trade-off may be determined primarily by stimulus-driven factors at encoding.


Asunto(s)
Memoria a Corto Plazo , Percepción Visual , Adolescente , Adulto , Atención/fisiología , Femenino , Humanos , Masculino , Memoria , Modelos Estadísticos , Distribución Normal , Estimulación Luminosa , Tiempo de Reacción , Reproducibilidad de los Resultados , Percepción Espacial/fisiología , Visión Ocular , Percepción Visual/fisiología
17.
J Exp Psychol Hum Percept Perform ; 38(5): 1228-41, 2012 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-22708745

RESUMEN

We used repetition blindness to investigate the nature of the representations underlying identification of manipulable objects. Observers named objects presented in rapid serial visual presentation streams containing either manipulable or nonmanipulable objects. In half the streams, 1 object was repeated. Overall accuracy was lower when streams contained 2 different manipulable objects than when they contained only nonmanipulable objects or a single manipulable object. In addition, nonmanipulable objects induced repetition blindness, whereas manipulable objects were associated with a repetition advantage. These findings suggest that motor information plays a direct role in object identification. Manipulable objects are vulnerable to interference from other objects associated with conflicting motor programs, but they show better individuation of repeated objects associated with the same action.


Asunto(s)
Reconocimiento Visual de Modelos/fisiología , Desempeño Psicomotor/fisiología , Memoria Implícita/fisiología , Percepción Espacial/fisiología , Adulto , Femenino , Humanos , Masculino , Pruebas Neuropsicológicas , Factores de Tiempo , Adulto Joven
18.
Neuropsychologia ; 49(6): 1458-65, 2011 May.
Artículo en Inglés | MEDLINE | ID: mdl-21335015

RESUMEN

Visual short-term memory (VSTM) is limited in capacity. Therefore, it is important to encode only visual information that is most likely to be relevant to behaviour. Here we asked which aspects of selective biasing of VSTM encoding predict subsequent memory-based performance. We measured EEG during a selective VSTM encoding task, in which we varied parametrically the memory load and the precision of recall required to compare a remembered item to a subsequent probe item. On half the trials, a spatial cue indicated that participants only needed to encode items from one hemifield. We observed a typical sequence of markers of anticipatory spatial attention: early attention directing negativity (EDAN), anterior attention directing negativity (ADAN), late directing attention positivity (LDAP); as well as of VSTM maintenance: contralateral delay activity (CDA). We found that individual differences in preparatory brain activity (EDAN/ADAN) predicted cue-related changes in recall accuracy, indexed by memory-probe discrimination sensitivity (d'). Importantly, our parametric manipulation of memory-probe similarity also allowed us to model the behavioural data for each participant, providing estimates for the quality of the memory representation and the probability that an item could be retrieved. We found that selective encoding primarily increased the probability of accurate memory recall; that ERP markers of preparatory attention predicted the cue-related changes in recall probability.


Asunto(s)
Nivel de Alerta/fisiología , Atención/fisiología , Memoria a Corto Plazo/fisiología , Recuerdo Mental/fisiología , Percepción Visual/fisiología , Adulto , Algoritmos , Variación Contingente Negativa/fisiología , Discriminación en Psicología/fisiología , Potenciales Evocados/fisiología , Femenino , Humanos , Masculino , Modelos Neurológicos , Valores de Referencia , Adulto Joven
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