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Early- and late-onset startle modulation in unipolar depression
Gabriel S Dichter1, Andrew J Tomarken, Richard C Shelton
1Department of Psychology, College of Arts & Science, Vanderbilt University, Nashville, Tennessee 37203, USA.
Psychophysiology
|April 23, 2004
Summary
Depression is linked to altered emotional responses, with startle modulation showing deficits not detected by self-report. This study highlights acoustic startle reflex as a sensitive measure for affective response anomalies in depression.
Area of Science:
- Neuroscience
- Psychology
- Psychiatry
Background:
- Depression is associated with altered emotional processing.
- Self-report measures may not fully capture these emotional deficits.
- Acoustic startle reflex is a psychophysiological measure sensitive to emotional states.
Purpose of the Study:
- To investigate acoustic startle eyeblink modulation in unipolar depression.
- To compare emotional responses between depressed and nondepressed individuals.
- To assess the impact of Bupropion SR treatment on these responses.
Main Methods:
- Two experimental sessions assessed acoustic startle eyeblink modulation and subjective ratings.
- Participants included unipolar depressed (before and after treatment) and nondepressed individuals.
- Emotional pictures were presented with early (300 ms) and late (3,500–4,500 ms) startle probes.
Main Results:
- Both groups showed arousal-dependent startle modulation to early probes.
- Nondepressed participants exhibited valence-dependent modulation to late probes.
- Depressed participants' late-probe responses were not valence-dependent, irrespective of treatment.
- No group differences were found in subjective emotional ratings.
Conclusions:
- Depression may involve anomalous responses to affective stimuli.
- Acoustic startle modulation is a more sensitive index of affective response deficits in depression than self-report.
- Bupropion SR treatment did not alter the observed pattern of startle modulation differences.