کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5042254 1474381 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Heritability of startle reactivity and affect modified startle
ترجمه فارسی عنوان
وراثت پذیری واکنش های هیجان انگیز و تاثیر گذار بر ضربان اصلاحی
کلمات کلیدی
شروع رعد و برق بلخی، وراثت، ژنتیک، محیط زیست، اصلاح تاثیر می گذارد،
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی علوم اعصاب رفتاری
چکیده انگلیسی


- Mean startle blink amplitudes were higher in females compared to males , indicating greater baseline defensive reactivity.
- Variance in startle blink reflex was explained primarily by genetic factors in males and by environmental factors in females.

Startle reflex and affect-modified startle reflex are used as indicators of defensive reactivity and emotional processing, respectively. The present study investigated the heritability of both the startle blink reflex and affect modification of this reflex in a community sample of 772 twins ages 14-15 years old. Subjects were shown affective picture slides falling in three valence categories: negative, positive and neutral; crossed with two arousal categories: high arousal and low arousal. Some of these slides were accompanied with a loud startling noise. Results suggested sex differences in mean levels of startle reflex as well as in proportions of variance explained by genetic and environmental factors. Females had higher mean startle blink amplitudes for each valence-arousal slide category, indicating greater baseline defensive reactivity compared to males. Startle blink reflex in males was significantly heritable (49%), whereas in females, variance was explained primarily by shared environmental factors (53%) and non-shared environmental factors (41%). Heritability of affect modified startle (AMS) was found to be negligible in both males and females. These results suggest sex differences in the etiology of startle reactivity, while questioning the utility of the startle paradigm for understanding the genetic basis of emotional processing.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Psychophysiology - Volume 115, May 2017, Pages 57-64
نویسندگان
, , , , ,