Search strategies improve with practice, but not with time pressure or financial incentives

Anna Nowakowska* (Corresponding Author), Alasdair D.F. Clarke, Jacqueline von Seth, Amelia R Hunt

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

When searching for an object, do we minimize the number of eye movements we need to make? Under most circumstances, the cost of saccadic parsimony likely outweighs the benefit, given the cost is extensive computation and the benefit is a few hundred milliseconds of time saved. Previous research has measured the proportion of eye movements directed to locations where the target would have been visible in the periphery, as away of quantifying the proportion of superfluous fixations. A surprisingly large range of individual differences has emerged from these studies,suggesting some people are highly efficient and others much less so. Our question in the current study is whether these individual differences can be explained by differences in motivation. In two experiments, we demonstrate that neither time pressure,nor financial incentive,led to improvements of visual search strategies; the majority of participants continued to make many superfluous fixations in both experiments. The wide range of individual differences inefficiency observed previously was replicated here. We observed small but consistent improvements in strategy over the course of the experiment (regardless of reward or time pressure)suggesting practice,not motivation, makes participants more efficient.
Original languageEnglish
Pages (from-to)1009-1021
Number of pages13
JournalJournal of Experimental Psychology: Human Perception and Performance
Volume47
Issue number7
DOIs
Publication statusPublished - Jul 2021

Keywords

  • visual search
  • optimality
  • reward
  • deadline
  • individual differences

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