A Systematic Review of the Effect of Neurofeedback in Cancer Patients.

INTRODUCTION: Neurofeedback (NF) or electroencephalogram (EEG)-Biofeedback is a drug-free form of brain training to directly alter the underlying neural mechanisms of cognition and behavior. It is a technique that measures a subject's EEG signal, processes it in real time, with the goal to enable a behavioral modification by modulating brain activity. The most common application of the NF technology is in epilepsies, migraine, attention-deficit/hyperactivity disorder, autism spectrum disorder, affective disorders, and psychotic disorders. Few studies have investigated the use of NF in context of psychosomatic illnesses. Little is known about the use in cancer patients or postcancer survivors despite the high number of this patient group. OBJECTIVES: We here provide a systematic review of the use and effect of NF on symptoms and burden in cancer patients and long-term cancer survivors. METHODS: In conducting this systematic review, we followed the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) Statement. RESULTS: Our search resulted in only 3 experimental studies, 1 observational study, and 2 case reports. Given the heterogeneity of the intervention systems and protocols, no meta-analysis was conducted. CONCLUSION: Altogether, there is initial evidence that NF is a complementary, drug-free, and noninvasive therapy that has the potential to ameliorate symptoms in this patient group, such as pain, fatigue, depression, and sleep. Further studies are highly needed.

[Questionnaire on the Experience of the Art Therapy Group in Psychosomatics from Patient View (FEKTP) - Construction and Validation of a Measuring Instrument]. / Fragebogen zum Erleben der Kunsttherapiegruppe in der Psychosomatik aus Patientensicht (FEKTP).

Art therapy is a clinically accepted method of therapy, but there are still very few studies that deal with the efficacy, change factors or mode of action of art therapy. In particular, there is a dearth of research instruments and psychometrically verified research tools specially fitted for art therapy which measures the experience dimensions of the art therapy group from the patient's point of view. Hence, it provides evidence of its effectiveness, better understands the art therapy group processes and serves quality assurance. The aim of the present study was to develop and validate the questionnaire on the experience of the art therapy group from patient view (FEKTP). This questionnaire is based on Grawe's and Yalom's conceptions of change factors in group therapy. 133 patients participated in the study and completed the FEKTP directly after the 6th art therapy session. Patients additionally received established questionnaires concerning clinical symptoms and experience processes at the beginning and end of treatment. Factor analysis demonstrated a clear factor structure of the FEKTP, which corresponded to the theoretically predicted subscales to the greatest extent. The test psychometric main quality criteria of the FEKTP (reliability, validity and objectivity) can be classified as acceptable to good range. The criterion validity appear to be given, but should be examined more exactly in future studies. Thus, a valid instrument for the systemic detection of general change factors for art therapy is now available. The questionnaire can be recommended for research as well as clinical contexts.

Ghrelin, leptin and adiponectin as possible predictors of the hedonic value of odors.

Several lines of evidence point to a close relationship between the hormones of energy homeostasis and the olfactory system. Examples are the localization of leptin and adiponectin receptors in the olfactory system or increased activation of brain regions related to the palatability and the hedonic value of food in response to food pictures after application of ghrelin. In this preliminary study, we tested in 31 subjects (17 male and 14 female) if and to what extent the peripheral blood concentrations of "satiety" hormones, such as leptin, adiponectin, and ghrelin (acyl and total), are correlated with the self-ratings of odor pleasantness and with the objective olfactory and gustatory ability. The hedonic values of some odors were found to be differently rated between donors depending on gender and body weight. The concentrations of leptin, adiponectin and total ghrelin were significantly associated with the hedonic value of pepper black oil, but failed to show significant correlations for 5 other odors tested. Except for a significant association between leptin and odor identification, hormone concentrations were not linked to the abilities of smell and taste. Peripheral adipokines and gut hormones may alter the perception and pleasantness of specific odors, presumably either directly through their receptors in the olfactory system or indirectly through central interfaces between the regulation systems of olfaction, appetite control, memory and motivation.