Facets of externalizing psychopathology in relation to inhibitory control and error processing

Area of Science:

• Neuroscience
• Psychopathology
• Cognitive Psychology

Background:

• Externalizing psychopathology is often characterized by difficulties in behavioral and impulse control.
• Cognitive indicators like P3, error-related negativity (ERN), and error positivity (Pe) are linked to inhibitory control and error processing.
• The relationship between specific externalizing symptom facets and these neurocognitive markers is not fully understood.

Purpose of the Study:

• To investigate the associations between distinct externalizing symptom facets and behavioral/electrophysiological indices of inhibitory control and error processing.
• To differentiate the neurocognitive profiles of general externalizing tendencies, callous-aggression, and substance dependence.
• To clarify whether substance use symptoms represent general disinhibition or specific substance-related issues.

Main Methods:

• Confirmatory Factor Analyses were used to model a general externalizing factor (EXT), a callous-aggression factor (CAL), and an alcohol and drug dependence factor (AD/DD) in a sample of 497 offenders.
• Behavioral phenotypes including substance use, aggression, personality, and internalizing symptoms were assessed.
• Electrophysiological and behavioral measures of inhibitory control (e.g., flanker task, P3, commission errors) and error processing (ERN, Pe, post-error slowing) were examined in a subset of 89 participants.

Main Results:

• Factor analyses supported a general EXT factor and a CAL factor. Unique AD/DD variance significantly overlapped with the general EXT factor.
• The general EXT factor was associated with impulsivity, negative affect, and deficits in error monitoring, but showed enhanced processing of inhibitory cues.
• The CAL factor was linked to affective shallowness and, notably, enhanced processing of inhibitory cues and error adjustment.

Conclusions:

• Substance use symptoms in this context may reflect broader disinhibition rather than substance-specific variance.
• Distinct externalizing facets, like callous-aggression, exhibit unique neurocognitive signatures related to inhibitory control and error processing.
• Understanding these neurocognitive processes is crucial for differentiating and potentially treating various manifestations of disordered behavioral inhibition.