دانلود مقاله ISI انگلیسی شماره 60725
ترجمه فارسی عنوان مقاله

سرکوب P50 در پارادایم شرطی سازی ترس تبعیض انسان با استفاده از سیگنال های خطر و ایمنی

عنوان انگلیسی
P50 suppression in human discrimination fear conditioning paradigm using danger and safety signals
کد مقاله سال انتشار تعداد صفحات مقاله انگلیسی
60725 2012 7 صفحه PDF
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : International Journal of Psychophysiology, Volume 84, Issue 1, April 2012, Pages 26–32

ترجمه کلمات کلیدی
اضطراب؛ راهگاهی حسی؛ سرکوب P50؛ شرطی سازی ترس کلاسیک؛ انقراض ترس
کلمات کلیدی انگلیسی
Anxiety; Sensory gating; P50 suppression; Classical fear conditioning; Fear extinction
پیش نمایش مقاله
پیش نمایش مقاله  سرکوب P50 در پارادایم شرطی سازی ترس تبعیض انسان با استفاده از سیگنال های خطر و ایمنی

چکیده انگلیسی

Auditory P50 suppression, which is assessed using a paired auditory stimuli (S1 and S2) paradigm to record the P50 mid-latency evoked potential, is assumed to reflect sensory gating. Recently, P50 suppression deficits were observed in patients with anxiety disorders, including panic disorder, post-traumatic stress disorder and obsessive–compulsive disorder, as we previously reported. The processes of fear conditioning are thought to play a role in the pathophysiology of anxiety disorders. In addition, we found that the P50 sensory gating mechanism might be physiologically associated with fear conditioning and extinction in a simple human fear-conditioning paradigm that involved a light signal as a conditioned stimulus (CS +). Our objective was to investigate the different patterns of P50 suppression in a discrimination fear-conditioning paradigm with both a CS + (danger signal) and a CS − (safety signal). Twenty healthy volunteers were recruited. We measured the auditory P50 suppression in the control (baseline) phase, in the fear-acquisition phase, and in the fear-extinction phase using a discrimination fear-conditioning paradigm. Two-way (CSs vs. phase) Analysis of variance with repeated measures demonstrated a significant interaction between the two factors. Post-hoc LSD analysis indicated that the P50 S2/S1 ratio in the CS + acquisition phase was significantly higher than that in the CS − acquisition phase. These results suggest that the auditory P50 sensory gating might differ according to the cognition of the properties (potentially dangerous or safe) of the perceived signal.