Perception & Psychophysics

, Volume 2, Issue 3, pp 101–105

Pupillary responses in a pitch-discrimination task

Authors

  • Daniel Hahnemann
    • Center for cognitive studiesHarvard University
  • Jackson Beatty
    • Human Performance CenterUniversity of Michigan
Article

DOI: 10.3758/BF03210302

Cite this article as:
Hahnemann, D. & Beatty, J. Perception & Psychophysics (1967) 2: 101. doi:10.3758/BF03210302
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Abstract

Pupils were measured while observers made pitch judgments under the method of constant stimuli. A substantial dilation occurs immediately after the presentation of the comparison tone, and the size of this response is closely correlated to the difficulty of the discrimination. Baseline changes occur within each block of trials, but have little effect on the magnitude of dilations. Responses to redundant stimuli, including the standard itself, decrease during the experimental session. The results support the validity of pupillary measurements as an index of processing load.

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© Psychonomic Press 1967