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Keywords:

  • Pupil diameter;
  • Information processing;
  • Information overload;
  • Mental activity;
  • Performance differences

ABSTRACT

As a test of the hypothesis that pupil dilation during performance is partially due to a task related anxiety component, pupillary patterns were measured while subjects (Ss) processed digit strings of various lengths for immediate recall. Information overload resulted in a leveling of the dilation pattern which suggested a momentary suspension of processing effort. In addition, significant correlations were observed between individual differences in pupil size and recall performance.