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Pupillometry reveals increased pupil size during indirect request comprehension.

Johanne Tromp1,2, Peter Hagoort1,3, Antje S Meyer1,3

  • 1a Max Planck Institute for Psycholinguistics , Nijmegen , The Netherlands.

Quarterly Journal of Experimental Psychology (2006)
|June 26, 2015
PubMed
Summary

Pupil size increases when comprehending indirect requests, indicating greater cognitive effort. This study shows pupillometry can measure pragmatic processing demands in language comprehension.

Keywords:
Experimental pragmaticsIndirect requestsLanguage comprehensionPupillometrySpeech act

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Area of Science:

  • Cognitive Psychology
  • Psycholinguistics
  • Neuroscience

Background:

  • Pupil size fluctuations correlate with cognitive load during language processing.
  • The impact of pragmatic manipulations on pupil size remains under-explored.

Purpose of the Study:

  • To investigate if pupil diameter is sensitive to processing demands in pragmatic language comprehension.
  • To determine if understanding indirect requests increases cognitive load compared to direct statements.

Main Methods:

  • Two pupillometry experiments were conducted.
  • Participants viewed 120 picture-sentence combinations.
  • Stimuli were designed as either indirect requests or direct statements.

Main Results:

  • Pupil diameter was significantly larger when comprehending indirect requests compared to direct statements.
  • Results were consistent across both experiments.
  • Increased pupil size reflects heightened processing demands for indirect utterances.

Conclusions:

  • Pupil size is a valid indicator of cognitive effort in pragmatic language comprehension.
  • Pupillometry offers a valuable tool for studying the neural basis of pragmatics.
  • Understanding indirect speech requires additional inferential processing.