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Am I safe? The ventrolateral prefrontal cortex 'detects' when an unpleasant event does not occur
Stephan Bender1, Stefanie Hellwig, Franz Resch
1Department for Child and Adolescent Psychiatry, University of Heidelberg, and Section for Experimental Psychopathology, Psychiatric Hospital, Germany. Stephan.Bender@med.uni-heidelberg.de
Neuroimage
|September 18, 2007
Summary
The human ventrolateral prefrontal cortex (VLPFC) activates when anticipating unpleasantness, signaling safety when the expected negative stimulus is absent. This brain response aids in detecting avoidance opportunities.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Electrophysiology
Background:
- The ventrolateral prefrontal cortex (VLPFC) is involved in detecting contingencies and evaluating emotional stimuli.
- Mechanisms for avoiding unpleasant events are not fully understood.
- The VLPFC's role in detecting the absence of expected negative stimuli requires further investigation.
Purpose of the Study:
- To investigate if the absence of an unpleasant somatosensory stimulus can activate the human VLPFC.
- To explore VLPFC activation as a correlate of contingency detection, specifically the feeling of safety.
- To understand brain mechanisms for detecting conditions under which harmful events can be avoided.
Main Methods:
- Differential trace-conditioning paradigm with unpleasant somatosensory stimuli.
- High-resolution DC electroencephalography (EEG).
- Current source density mapping and spatio-temporal source analysis.
Main Results:
- A significant negativity over the VLPFC occurred after the nonreinforced stimulus, approximately 1 second after the expected unpleasant stimulus time.
- This VLPFC activation occurred without any directly preceding stimulus, indicating detection of an expected absence.
- A lateralized negativity (N700) was observed in reinforced trials, linked to prolonged somatosensory system activation preceding VLPFC engagement.
Conclusions:
- The VLPFC can be activated by stimulus sequences that create an expectation of an unpleasant event, even in its absence.
- This VLPFC response may facilitate the detection of safety and avoidance of potential harm.
- The N700 component provides insights into the temporal dynamics of somatosensory memory traces.
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