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Science. 1966 Dec 23;154(3756):1583-5.

Pupil diameter and load on memory.

Abstract

During a short-term memory task, pupil diameter is a measure of the amount of material which is under active processing at any time. The pupil dilates as the material is presented and constricts during report. The rate of change of these functions is related to task difficulty.

PMID:
5924930
[PubMed - indexed for MEDLINE]
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