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Mental rotation in unipolar major depression
M A Rogers1, J L Bradshaw, J G Phillips
1Neuropsychology Research Unit, Department of Psychology, Monash University, Clayton, Vic., Australia. marl.rogers@sci.monash.edu.au
Journal of Clinical and Experimental Neuropsychology
|April 6, 2002
Summary
Mental rotation performance may indicate slowed motor preparation in depression. Melancholic depression specifically impacts motor planning, suggesting a key role in psychomotor retardation.
Area of Science:
- Cognitive Neuroscience
- Psychiatry
Background:
- Mental rotation (MR) performance can serve as an indicator of mental slowing (bradyphrenia).
- This slowing may particularly reflect the speed of motor preparation, a key component of psychomotor function.
- Depression, especially melancholic depression, is often associated with psychomotor retardation.
Purpose of the Study:
- To investigate whether slowed motor preparation, assessed via the mental rotation task, contributes to psychomotor retardation in unipolar depression.
- To differentiate between general motor slowing and specific deficits in motor planning in depressed patients.
- To compare these effects in melancholic and non-melancholic unipolar depression subtypes.
Main Methods:
- A mental rotation task was administered to participants.
- The study included three groups: melancholic unipolar depressed patients (n=8), non-melancholic unipolar depressed patients (n=9), and healthy controls (n=10).
- Performance was analyzed for overall response time (general slowing) and the slope of the MR function (motor preparation speed).
Main Results:
- Both melancholic and non-melancholic depressed patients exhibited generalized slowing compared to controls, indicating bradykinesia or akinesia.
- This generalized slowing was significantly more pronounced in the melancholic group.
- Melancholic patients demonstrated a specific slowing of mental rotation with increasing orientation angles, suggesting impaired motor planning, unlike non-melancholic patients and controls.
Conclusions:
- Generalized motor slowing is present in both melancholic and non-melancholic depression.
- Melancholic depression is characterized by a specific deficit in motor planning, evidenced by slowed mental rotation.
- These findings highlight the significant role of slowed motor planning in the psychomotor retardation observed in melancholic depression.