The effect of motor task precision on pupil diameter

Kingsley Fletcher, Andrew Neal, Gillian Yeo

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


It is well established that an increase in cognitive task demands is associated with increased pupil diameter. However, the effect of increased motor task demands on pupil diameter is less clear. Previous research indicates that higher motor task complexity increases pupil diameter but suggests that higher motor task precision demands may decrease pupil diameter during task movement. The current study investigated the effect of increased motor task precision on pupil diameter using a Fitts' Law movement task to manipulate motor response precision. Increased precision demands were associated with reduced pupil diameter during the response preparation and response execution phases of the movement trials. This result has implications for the interpretation of pupil diameter as an index of workload during tasks which involve precise motor movements.

Original languageEnglish
Pages (from-to)309-315
Number of pages7
JournalApplied Ergonomics
Early online date28 Jul 2017
Publication statusPublished - 1 Nov 2017


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