Grasping the world: object-affordance effect in schizophrenia.

Area of Science:

• Cognitive Neuroscience
• Psychiatry

Background:

• Schizophrenia often leads to a diminished sense of practical meaning derived from sensory-motor experiences.
• Previous research has not explored the integration of perception and action in individuals with schizophrenia.

Purpose of the Study:

• To investigate deficits in sensory-motor simulation in schizophrenic patients, even when visuospatial integration is intact.
• To compare sensory-motor compatibility between schizophrenic patients and control subjects.

Main Methods:

• Two stimulus-response compatibility (SRC) tasks were employed: the Simon Effect task to assess visuospatial integration and the Object Affordance task to assess sensory-motor compatibility.
• Schizophrenic patients and control subjects participated in both experiments.

Main Results:

• Control subjects exhibited SRC effects in both tasks.
• Schizophrenic patients showed SRC effects only when stimuli and responses shared the same spatial location, indicating a loss of automatic sensory-motor simulation.

Conclusions:

• Schizophrenic patients may experience a breakdown in the automatic link between perceiving an object and preparing to act upon it.
• This deficit in sensory-motor simulation could stem from a disconnect between the object and the patient's environmental context.