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Prefrontal hemodynamic activity predicts false memory--a near-infrared spectroscopy study.
Yasutaka Kubota1, Motomi Toichi, Mitsue Shimizu
1Mood Disorders Program, Department of Psychiatry, Case Western Reserve University/University Hospitals of Cleveland, Cleveland, OH 44106, USA. yka@sue.shiga-u.ac.jp
Neuroimage
|March 21, 2006
Summary
The prefrontal cortex (PFC) plays a key role in memory distortion. Real-time monitoring revealed increased PFC activity during false recognition, suggesting its involvement in recalling non-experienced events.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Memory Research
Background:
- Lesion studies implicate the prefrontal cortex (PFC) in episodic memory reconstruction and distortion.
- Functional imaging suggests PFC involvement in the illusory recollection of non-experienced events.
Purpose of the Study:
- To investigate the role of PFC hemodynamics during false recognition using near-infrared spectroscopy (NIRS).
- To examine the relationship between PFC activity during encoding and subsequent false recognition.
Main Methods:
- Real-time monitoring of prefrontal cortex (PFC) hemodynamics using a two-channel near-infrared spectroscopy (NIRS) system.
- Subjects studied word lists and were later tested on recognition, including unstudied items (false recognition).
Main Results:
- Bilateral increases in oxygenated hemoglobin ([oxy-Hb]) were observed during false recognition compared to true recognition.
- A left PFC dominant increase in [oxy-Hb] during encoding predicted subsequent false recognition.
- Left PFC activity, reflecting semantic processing, correlated with the tendency for false recognition.
Conclusions:
- Prefrontal cortex (PFC) activity, particularly in the left hemisphere, is associated with false recognition.
- Semantic processing within the left PFC may contribute to the misattribution of non-experienced events as remembered.