The attentional blink in schizophrenia: isolating the perception/attention interface

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychiatry

Background:

• Schizophrenia is associated with visual processing deficits affecting both early perception and higher-order cognition.
• The impact of schizophrenia on the interaction between early perceptual and higher-order processes remains unclear.

Purpose of the Study:

• To investigate visual processing deficits at the interface of perception and attention in schizophrenia.
• To examine the attentional blink (AB) effect in patients with schizophrenia using rapid serial visual processing (RSVP) tasks.

Main Methods:

• Administered two RSVP tasks: a single target detection task for basic visual perception and a dual target detection task to measure the AB effect.
• 143 patients with schizophrenia/schizoaffective disorder and 80 healthy controls participated.
• Participants identified targets (T1 and T2) presented at varying lags in a rapid visual stream.

Main Results:

• Both groups exhibited the typical AB effect, with reduced T2 accuracy 200-500 ms after T1.
• Patients with schizophrenia showed an exaggerated AB effect compared to controls.
• This exaggeration persisted even after correcting for single-task performance, with deficits extending beyond typical AB lags.

Conclusions:

• Schizophrenia is associated with deficits in visual processing at the perception-attention interface.
• Patients with schizophrenia demonstrate a general attentional deficit, as evidenced by the exaggerated AB effect.
• Findings suggest disruptions in integrating early perceptual information with attentional control mechanisms in schizophrenia.