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Functional anatomical study of psychogenic amnesia
F Yasuno1, T Nishikawa, Y Nakagawa
1Department of Neuropsychiatry, Biomedical Research Center, Osaka University Medical School, 2-2 Yamadaoka, Suita, 565-0871, Osaka, Japan. yasuno@nirs.go.jp
Psychiatry Research
|July 13, 2000
Summary
Psychogenic amnesia involves memory loss from trauma, not brain damage. PET scans show altered brain activity in the amygdala and hippocampus during amnesia and recovery.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Medical Imaging
Background:
- Psychogenic amnesia is a dissociative disorder characterized by memory loss unrelated to structural brain injury.
- It is often triggered by significant psychological stress or trauma.
- Understanding the neural correlates of psychogenic amnesia is crucial for diagnosis and treatment.
Observation:
- Positron emission tomography (PET) was used to study brain activity in one psychogenic amnesic patient and 12 controls during a face memory task.
- The patient exhibited increased activation in the right anterior medial temporal region (including the amygdala) compared to controls.
- Control subjects showed increased activation in bilateral hippocampal regions, which was not observed in the patient.
Findings:
- During recovery (12 months post-onset), the patient's right anterior medial temporal region showed decreased activation, while the right hippocampus showed increased activation.
- Differences in activation were also noted in the anterior cingulate cortex and prefrontal cortex between the patient and controls.
- These limbic and limbic-cortical functional changes correlate with psychogenic amnesia symptoms.
Implications:
- PET imaging reveals distinct patterns of brain activity associated with psychogenic amnesia.
- Functional changes in the amygdala, hippocampus, and prefrontal cortex may underlie the memory deficits.
- These findings contribute to understanding the neurobiology of trauma-related memory disorders.