Visual search irregularities in schizophrenia depend on display size switching

Area of Science:

• Cognitive psychology
• Neuroscience
• Psychiatry

Background:

• Schizophrenia patients exhibit slower response times (RTs) in visual search tasks, particularly in the "one-absent" condition.
• Previous research indicates slowed RTs when participants search through displays with one or multiple stimuli.

Purpose of the Study:

• To replicate the observed "one-absent" slowing effect in schizophrenia patients.
• To investigate the cognitive operations underlying this effect by comparing display-size switch and repeat trials.

Main Methods:

• Two experiments were conducted involving patients with schizophrenia and control participants.
• Participants performed a visual search task with one or four stimuli, with trials involving either switching or repeating display sizes.

Main Results:

• The "one-absent" slowing effect observed in schizophrenia patients was eliminated on repeat trials.
• This finding held true whether switch and repeat trials were mixed or presented in separate blocks.

Conclusions:

• The "one-absent" slowing effect in schizophrenia may be linked to difficulties with cognitive switching and insufficient cueing.
• The visual search paradigm used shows promise for developing a neurocognitive profile for schizophrenia.