Related Experiment Video
Updated: Mar 24, 2026

Habituation and Prepulse Inhibition of Acoustic Startle in Rodents
Published on: September 1, 2011
Modulation of Prepulse Inhibition and Startle Reflex by Emotions: A Comparison between Young and Older Adults
Jolyanne Le Duc1, Philippe Fournier1, Sylvie Hébert1
1School of Speech Pathology and Audiology, Faculty of Medicine, Université de MontréalMontréal, QC, Canada; BRAMS, International Laboratory for Research on Brain, Music, and Sound, Université de MontréalMontréal, QC, Canada; CRIUGM, Centre de Recherche de l'Institut Universitaire de Gériatrie de MontréalMontréal, QC, Canada.
Abstract:
This study examined whether or not the acoustic startle response and sensorimotor gating may be modulated by emotions differentially between young and older adults. Two groups of participants (mean age Young: 24 years old; Elderly: 63.6 years old) were presented with three types of auditory stimuli (Startle alone, High or Low frequency Prepulse) while viewing pleasant, neutral, or unpleasant images. Electromyographic activity of the eyeblink response was measured. Results show that older adults displayed diminished eyeblink responses whereas younger adults displayed enhanced eyeblink responses when viewing negative images. Sensorimotor gating also differed between young and older adults, with enhanced sensorimotor gating abilities while viewing positive pictures in older adults and diminished abilities while viewing negative pictures among younger adults. These results argue in favor of a differential emotional influence on the sensorimotor abilities of young and older adults, with a positivity bias among the latter.
Related Concept Videos
Facial Feedback Hypothesis
Physiology of Emotion
Autonomic Nervous System
The autonomic nervous system (ANS) plays a critical role in emotional responses by regulating involuntary physiological functions. It consists of two main components: the sympathetic and parasympathetic systems. The sympathetic system...
The Influence of Cognition on Affect
Socioemotional Development during Infancy
Primary Temperament Types

