Related Experiment Videos
Olfactory dysfunction in schizophrenia and temporal lobe epilepsy
C G Kohler1, P J Moberg, R E Gur
1Department of Psychiatry, University of Pennsylvania School of Medicine, Philadelphia, USA. kohler@bblmail.psycha.upenn.edu
Summary
Patients with schizophrenia and right temporal lobe epilepsy (TLE) show similar olfactory identification deficits, suggesting right-hemisphere involvement in olfactory processing for both conditions.
Area of Science:
- Neuroscience
- Clinical Psychology
- Neurology
Background:
- Schizophrenia and mesial temporal lobe epilepsy (TLE) are common neurological disorders.
- Both conditions involve dysfunction in temporo-limbic neural pathways.
- Shared neural substrates may lead to overlapping cognitive deficits.
Purpose of the Study:
- To investigate olfactory performance similarities between schizophrenia patients and those with right or left TLE.
- To determine if olfactory processing deficits in schizophrenia align more closely with right or left TLE.
Main Methods:
- Odor identification (University of Pennsylvania Smell Identification Test - UPSIT) and odor detection threshold (phenyl ethyl alcohol - PEA) were assessed.
- Participants included 40 schizophrenia patients, 14 right TLE, 18 left TLE patients, and 25 healthy controls.
Main Results:
- Schizophrenia and right TLE groups showed significant UPSIT impairment compared to controls.
- Left TLE patients performed similarly to controls on odor identification.
- No significant differences in odor detection threshold sensitivity were found among the groups.
Conclusions:
- Olfactory processing appears to rely more heavily on right hemisphere structures.
- Findings support neuroimaging studies implicating right hemispheric dysfunction in schizophrenia's olfactory processing deficits.