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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
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Does attention move or spread during mental curve tracing?

David Crundall1, Richard Dewhurst, Geoffrey Underwood

  • 1School of Psychology, University of Nottingham, Nottingham, England. david.crundall@nottingham.ac.uk

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Attention does not spread continuously along a traced line. Instead, resources for detecting changes decrease on already traced portions, refuting the spreading attention theory.

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Area of Science:

  • Cognitive Psychology
  • Visual Attention
  • Perceptual Processes

Background:

  • Two theories explain attention during line tracing: a moving zoom lens or spreading attention.
  • Recent evidence suggests attention spreads, possibly linked to object parsing.

Purpose of the Study:

  • To experimentally test the spreading versus moving accounts of attention during line tracing.
  • To determine if attention encompasses the entire line or is more localized.

Main Methods:

  • Three experiments involved participants tracing one of two intertwined lines.
  • A masked change, often reversing the response, was introduced during tracing.
  • Participants' ability to detect changes at different points in the tracing process was measured.

Main Results:

  • Participants were less able to detect changes occurring later in the tracing process.
  • Difficulty in detecting late changes suggests resources diminish on previously traced segments.
  • This finding contradicts the notion of attention spreading across the entire line.

Conclusions:

  • The results challenge the theory of a spreading trace of attention that encompasses the whole line.
  • Attention deployment during line tracing may be more resource-limited than previously thought.
  • Findings support a model where attention is not uniformly available along the entire traced path.