Right hemispheric function in normals, affective disorder and schizophrenia.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Clinical Psychology

Background:

• The happy-sad chimeric faces test is a validated tool for assessing right hemispheric function.
• This test typically induces a left hemifacial bias (LHF bias) in right-handed individuals.

Purpose of the Study:

• To investigate right hemispheric function in patients with mania, depression, and schizophrenia using the happy-sad chimeric faces test.
• To determine if LHF bias differs between healthy controls and patient groups.

Main Methods:

• 41 healthy controls and 19 patients (manic, depressive, schizophrenic) were tested.
• All participants were strictly right-handed.
• The happy-sad chimeric faces test was administered to assess LHF bias.

Main Results:

• Healthy controls and patients with depression exhibited a significant LHF bias.
• Patients with mania and schizophrenia did not display a significant LHF bias.
• A notable difference in LHF bias was observed between the healthy/depressive groups and the manic/schizophrenic groups.

Conclusions:

• The findings suggest intact right hemispheric function in healthy individuals and those with depression, as indicated by significant LHF bias.
• The absence of significant LHF bias in manic and schizophrenic patients points towards potential right hemispheric dysfunction in these conditions.
• The happy-sad chimeric faces test may serve as a valuable indicator for identifying right hemispheric dysfunction in psychiatric disorders.