PET Scans

Episodic

Task

Semantic

Task

Difference

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Episodic Task: remembering an experience that happened 40 years ago

Semantic task: thinking about the history of astronomy that was learned 40 years ago

Red:above-average blood flow, yellow: average blood flow, green: below-average blood flow.

Difference: Red: greater activation during episodic task, Green: greadter activation during semantic task