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The simon effect in schizophrenic patients with negative symptoms
Silvia Gastaldo1, Carlo Umiltà, Gianluigi Bianchin
1Dipartimento di Psicologia Generale, Università di Padova, Italia.
Summary
Schizophrenic patients struggle with automatic attention shifts, showing slower reaction times in the left hemifield during the Simon task. This suggests a difficulty inhibiting automatic responses and external stimuli dependence.
Area of Science:
- Cognitive psychology
- Neuroscience
- Psychiatry
Background:
- Schizophrenia is often characterized by cognitive deficits.
- Negative symptomatology in schizophrenia can impact attentional processes.
- The Simon task is a standard paradigm for studying response inhibition and attention.
Purpose of the Study:
- To investigate automatic shifting of visual attention in schizophrenic patients.
- To examine reaction time differences in conditions of spatial correspondence and non-correspondence.
- To explore hemispheric asymmetries in attentional control in schizophrenia.
Main Methods:
- Utilized the Simon task to assess visual attention.
- Recorded reaction times under conditions of spatial correspondence and non-correspondence.
- Compared performance between schizophrenic patients and control groups (implied).
Main Results:
- Schizophrenic patients exhibited significant reaction time asymmetries between visual hemifields.
- A notable slowing of reaction times was observed for non-corresponding trials in the left hemifield.
- These findings indicate impaired inhibition of automatic responses.
Conclusions:
- Schizophrenic patients demonstrate a deficit in inhibiting automatic, stimulus-driven responses.
- Difficulties in disengaging from external stimuli were identified, particularly in the left hemifield/right hemisphere.
- Results suggest specific attentional control impairments in schizophrenia, especially concerning response inhibition.