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Hemispheric asymmetries in memory processes as measured in a false recognition paradigm
Carmen E Westerberg1, Chad J Marsolek
1Department of Psychology, University of Minnesota, Minneapolis 55455, USA. west0461@tc.umn.edu
Summary
The left hemisphere better rejects false memories than the right, suggesting semantic processing is more restricted there. This challenges theories of hemispheric memory trace interpretation versus veridicality.
Area of Science:
- Cognitive Neuroscience
- Neuropsychology
- Psycholinguistics
Background:
- Cerebral hemisphere differences in memory processing are established but debated.
- Existing theories propose distinct roles for left and right hemispheres in memory encoding and retrieval.
Purpose of the Study:
- To investigate hemispheric asymmetries in false memory using a novel, common paradigm.
- To test competing theories of semantic processing and memory trace characteristics in each hemisphere.
Main Methods:
- Auditory presentation of semantically related word lists to induce false memories.
- Recognition testing using divided-visual-field presentation to assess left and right hemisphere function.
- Measurement of correct rejection rates and confidence levels for critical lure words.
Main Results:
- Participants exhibited superior ability to reject unpresented critical words in the right visual field/left hemisphere (RVF/LH) compared to the left visual field/right hemisphere (LVF/RH).
- Confidence in rejecting these false memories was also significantly higher for RVF/LH presentations.
- Findings support a restricted semantic activation model in the left hemisphere but contradict a veridical memory trace model.
Conclusions:
- The left hemisphere demonstrates enhanced precision in inhibiting semantically related false memories.
- Results suggest hemispheric specialization in semantic processing, with implications for understanding memory biases.
- A reconciliation of conflicting theories on hemispheric memory function is proposed.