Ies [FIGS]; Maxwell, 1992). Testing Session Procedures Before testing, participants abstained for >3 hr from caffeine and/or smoking/nicotine, as well as from alcohol/drugs (apart from contraceptives and medication essential to get a stabilized physical condition) beginning at midnight. Upon arrival for the laboratory, subjective mood evaluations had been carried out. Concurrently, electrodes were applied, immediately after which the experiment commenced. This study was authorized by the Royal Ottawa Health Care Group and the University of Ottawa Social Sciences and Humanities Research Ethics Boards and informed consent was obtained from all participants. Participants wereJ Have an effect on Disord. Author manuscript; offered in PMC 2013 February 1.Jaworska et al.Pagecompensated 30.00 CDN/session (sufferers participated in multiple sessions as part of a bigger study).NIH-PA Author Manuscript NIH-PA Author Manuscript NIH-PA Author ManuscriptSubjective Mood Questionnaires Mood was assessed using the Profile of Mood States (POMS; McNair et al., 1992) on which participants rated their subjective state applying a Likert scale on 65 mood adjectives, from which values were aggregated to kind seven mood dimensions (tension-anxiety, depressiondejection, anger-hostility, vigor-activity, fatigue-inertia, confusion-bewilderment and total mood disturbance). Emotional Faces Recognition Process The faces recognition job was adapted from Krolak-Salmon et al. (2001). Thirty-six photographic faces displaying certainly one of four expressions (sadness [sad], joy, surprise [sur], neutral) have been presented individually on a screen in front with the seated participant ( 1 m) within a dim, electrically-shielded and sound-attenuated area. Every single emotion was expressed at 3 intensities (20 , 50 , 100 ) by a single actor. Two males and two females displayed one emotion at all intensities (i.e., 16 actors). Expressions at 20 intensity had been deemed “neutral” as they’re not reliably distinguished (Orgeta Phillips, 2008) and 0 expressions are additional probably to become confused with negative than with other facial expressions (Palermo Coltheart, 2004). Photographs had been digitized and converted to grey-scale images, matched for luminance and contrast, together with the neck and hair cropped out (Figure 1). Every single expression (neutral, sad50, sad100, joy50, LY300046 chemical information joy100, sur50, sur100) was pseudorandomly presented 80 occasions (no identical faces presented back-to-back) for 400 ms (ISI: 1500 ms; Presentation Software, Neurobehavioral Systems, Albany, CA, USA). Participants pressed a button to shocked faces (sur50, sur100) to make sure that they paid consideration to expressions. Hits ( correct responses to sur50 sur100), false alarms (FA; responses to non-surprised faces) and reaction instances (RT) have been recorded. Facial Expression Rating Questionnaire Soon after the job, participants rated ten faces (one male and 1 female expressing every single of joy50, joy100, sad50, sad100 and neutral) presented in the course of the activity. Faces had been rated employing a Likert scale from 0 (not at all) to 10 (incredibly substantially) on two valence queries: how 1) “sad” and 2) “happy” does the face appear. Participants rated the faces according to their gut reaction, taking two? min to rate all faces. Two questionnaire versions, containing distinct faces but bearing exactly the same expressions, had been administered. No variations existed involving the versions, therefore, ratings were averaged across the questionnaires. Electrophysiological Recordings PubMed ID:http://www.ncbi.nlm.nih.gov/pubmed/21228935/ Information Reduction EEG activity was recorded (500 Hz) working with a cap embedded.
