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Cholinergic stimulation alters performance and task-specific regional cerebral blood flow during working memory
M L Furey1, P Pietrini, J V Haxby
1Laboratory of Neurosciences, National Institute on Aging, National Institutes of Health, Bethesda, MD 20892, USA. kurkjian@alw.nih.gov
Summary
Physostigmine, an acetylcholinesterase inhibitor, improved working memory (WM) efficiency and reduced brain activity in healthy adults. This suggests enhanced cholinergic function boosts processing efficiency and lowers task effort.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Pharmacology
Background:
- Cholinergic system modulation impacts memory, notably working memory (WM), in various conditions.
- Alzheimer's disease and animal models show links between cholinergic function and memory deficits.
Purpose of the Study:
- To investigate functional brain response changes associated with cholinergic system modulation during a WM task.
- To correlate performance improvements with regional cerebral blood flow (rCBF) changes.
Main Methods:
- Healthy subjects underwent positron emission tomography (PET) scans measuring rCBF using H215O.
- Physostigmine, an acetylcholinesterase inhibitor, was administered to experimental group to modulate cholinergic activity.
- Subjects performed a face-based WM task during PET scans, alternating between rest and task conditions.
Main Results:
- Physostigmine enhanced WM efficiency, evidenced by faster reaction times.
- Physostigmine reduced WM task-related activity in the right midfrontal gyrus.
- A correlation was observed between physostigmine-induced improvements in reaction time and changes in right midfrontal rCBF.
Conclusions:
- Enhancing cholinergic function can improve cognitive processing efficiency, reducing the effort needed for WM tasks.
- Activation of the right prefrontal cortex is associated with the effort involved in performing WM tasks.