Few studies examined the influence of antipsychotic medications, and most, studies could not find a significant influence of medications in EMG recordings. However, a recent, study33 reported less zygomatic activity in unmedicated patients than in NCSs, and a decrease in smiling activity when IWSs were treated with risperidone, but, not with olanzapine. Autonomic nervous system Some physiological Inhibitors,research,lifescience,medical manifestations

of emotions, such as increased heart, rate, Fluorouracil cost perspiration, hot face, faster respiration, dry mouth, and increased urination are expressed through the ANS. Although some authors reported emotion-specific ANS response patterns, replications did not follow, and emotion-specific ANS response patterns have been considered as unreliable. Skin conductance. Skin conductance Inhibitors,research,lifescience,medical has been the most frequently physiological measure used to evaluate ANS response to emotions. Skin conductance is under sympathetic control, is correlated with the number of eccrine sweat glands, and is sensitive to a large range of stimuli, Inhibitors,research,lifescience,medical including emotional arousal.3-1 Compared with NCSs, IWSs showed similar (four studies) or higher (one study) skin conductance reactivity in positive conditions,

and similar (five studies) or higher (two studies) skin conductance reactivity in negative conditions. It should be noted that IWSs have shown more skin conductance reactivity even with neutral stimuli in two studies.31,35 A thorny issue concerns medication status. Acetylcholine, norepinephrine, and dopamine are Inhibitors,research,lifescience,medical neuromediators involved in the ANS,36 and it has been shown that antipsychotic medications have an impact on skin conductance. Therefore, it, has been thus recommended to conduct psychophysiological studies with unmedicated patients only. Among the studies just reviewed above, only two used unmedicated Inhibitors,research,lifescience,medical patients, and one of them37 reported a higher skin conductance for positive and negative conditions. Cardiovascular system. Other studies32,38-40 looked at cardiovascular reactivity (heart rate and blood volume)

to emotional stimuli. The results have been mixed. Some studies found no differences between groups, a decreased finger pulse volume reactivity, or different time-response curves for heart rate variability in schizophrenia. Conclusions: emotion expression It thus appears that expression studies in schizophrenia research can be divided into two broad categories: emotion expressiveness and emotion reactivity. Fossariinae Emotion expressiveness includes controlled expressions with an intentional component and their social, communicative value is evident. Expressiveness encompasses verbal output, and overt facial expressions. Emotion reactivity contains an idea of automaticity or covert, expressions. Covert facial muscle activity and ANS reactions can be placed in this category. IWSs show deficits in emotion expression in verbal, facial, and acoustic channels.