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Updated: Jun 24, 2026
11:01
Examining the Characteristics of Episodic Memory using Event-related Potentials in Patients with Alzheimer's Disease
Published on: August 30, 2011
Left posterior parietal cortex participates in both task preparation and episodic retrieval
Jeffrey S Phillips1, Katerina Velanova, David A Wolk
1Department of Psychology, University of Pittsburgh, Pittsburgh, PA 15260, USA.
Neuroimage
|March 17, 2009
Summary
Brain activity during memory retrieval preparation and execution was studied using fMRI. The left intraparietal sulcus (IPS) is crucial for both preparing for and executing memory retrieval tasks.
Area of Science:
- Cognitive Neuroscience
- Neuroimaging
Background:
- Optimal memory retrieval relies on stored information fidelity and attentional state.
- Mental preparedness influences memory retrieval efficiency.
Purpose of the Study:
- To differentiate preparatory brain activity from retrieval activity using fMRI.
- To investigate neural correlates of episodic and semantic memory retrieval preparation and execution.
Main Methods:
- Functional magnetic resonance imaging (fMRI) with a catch-trial paradigm.
- Separation of neural responses to task cues and memory probes.
- Analysis of brain activity during episodic and semantic retrieval tasks.
Main Results:
- Common brain regions, including bilateral intraparietal sulcus (IPS), were engaged during task preparation.
- Left IPS showed differential responses to old and new stimuli during retrieval.
- Right IPS responded to preparatory cues but showed less modulation during retrieval.
Conclusions:
- Left parietal cortex is strongly lateralized for retrieval success.
- Left IPS plays a role in both task preparation and memory retrieval, potentially involving attentional control or stimulus relevance monitoring.
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