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Pupillometry: A Window to the Preconscious?

Bruno Laeng1, Sylvain Sirois2, Gustaf Gredebäck3

  • 1Department of Psychology, University of Oslo bruno.laeng@psykologi.uio.no.

Perspectives on Psychological Science : a Journal of the Association for Psychological Science
|July 14, 2015
PubMed
Summary
This summary is machine-generated.

Pupillometry, the measurement of pupil diameter, has been a valuable tool in psychology for 50 years. Recent neuroscience findings link pupillary responses to the locus coeruleus, offering new insights into mental activity and attention.

Keywords:
attentionconsciousnessdevelopmentinfantmethodologyneuroscienceunconscious/automatic processing

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Area of Science:

  • Psychology
  • Neuroscience
  • Psychophysiology

Background:

  • Pupillometry, the measurement of pupil diameter, has been established in psychology for 50 years.
  • Seminal studies by Hess & Polt and Kahneman & Beatty pioneered its use.
  • Pupillary responses have been used to estimate mental activity intensity and changes in attention and perception.

Purpose of the Study:

  • To review the role of pupillometry in psychology.
  • To discuss recent neurophysiological findings on pupillary responses.
  • To highlight the potential of pupillometry for studying nonverbal participants.

Main Methods:

  • Review of seminal studies in pupillometry.
  • Discussion of recent neuroscience research correlating pupillary dilation with locus coeruleus activity.
  • Analysis of the noninvasive and continuous nature of pupillary measurements.

Main Results:

  • Pupillary responses provide a continuous, awareness-independent measure of mental activity.
  • A strong correlation exists between locus coeruleus activity and pupillary dilation.
  • Pupillometry offers insights into the noradrenergic system's role in cognition.

Conclusions:

  • Pupillometry is a versatile tool for assessing mental states.
  • Neurophysiological insights enhance the interpretation of pupillary responses.
  • Its noninvasive nature makes it ideal for studying infants, animals, and neurological patients.