Event-related potentials to rare visual targets and negative symptom severity in a transdiagnostic psychiatric sample.
OBJECTIVES
Negative psychiatric symptoms are often resistant to treatments, regardless of the disorder in which they appear. One model for a cause of negative symptoms is impairment in higher-order cognition. The current study examined how particular bottom-up and top-down mechanisms of selective attention relate to severity of negative symptoms across a transdiagnostic psychiatric sample.


METHODS
The sample consisted of 130 participants: 25 schizophrenia-spectrum disorders, 26 bipolar disorders, 18 unipolar depression, and 61 nonpsychiatric controls. The relationships between attentional event-related potentials following rare visual targets (i.e., N1, N2b, P2a, and P3b) and severity of the negative symptom domains of anhedonia, avolition, and blunted affect were evaluated using frequentist and Bayesian analyses.


RESULTS
P3b and N2b mean amplitudes were inversely related to the Positive and Negative Syndrome Scale-Negative Symptom Factor severity score across the entire sample. Subsequent regression analyses showed a significant negative transdiagnostic relationship between P3b amplitude and blunted affect severity.


CONCLUSIONS
Results indicate that negative symptoms, and particularly blunted affect, may have a stronger association with deficits in top-down mechanisms of selective attention.


SIGNIFICANCE
This suggests that people with greater severity of blunted affect, independent of diagnosis, do not allocate sufficient cognitive resources when engaging in activities requiring selective attention.
['Salgari|Giulia C|GC|', 'Potts|Geoffrey F|GF|', 'Schmidt|Joseph|J|', 'Chan|Chi C|CC|', 'Spencer|Christopher C|CC|', 'Bedwell|Jeffrey S|JS|']
D000328:Adult D005074:Evoked Potentials, Visual D005260:Female D006801:Humans D008297:Male D001523:Mental Disorders D008875:Middle Aged D010775:Photic Stimulation D012720:Severity of Illness Index D055815:Young Adult
Event-related potentials Negative symptoms Transdiagnostic Selective attention Schizophrenia-spectrum disorders Mood disorders