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Related Experiment Videos

An escape from crowding.

Jeremy Freeman1, Denis G Pelli

  • 1Swarthmore College, Swarthmore, PA, USA.

Journal of Vision
|January 26, 2008
PubMed
Summary
This summary is machine-generated.

Crowding impairs visual identification by integrating features over large regions. Cued change detection, however, remains unaffected by crowding, suggesting attention can overcome feature integration limits.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception

Background:

  • Visual crowding hinders object identification by integrating features across an expanded region.
  • The size of this integration region is debated, with bottom-up (anatomical) and top-down (attentional) accounts proposed.
  • Previous research suggested attention's spotlight determines crowding extent, but this relied on questionable assumptions.

Purpose of the Study:

  • To investigate the role of attention in visual crowding using a change blindness paradigm.
  • To determine if attentional cues can mitigate the effects of crowding on visual processing and memory.
  • To differentiate between bottom-up and top-down explanations of crowding.

Main Methods:

  • Participants performed a change detection task with letters presented at varying spacings and with/without flankers.

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  • An interstimulus cue indicated the target letter for some trials.
  • Performance was measured by capacity for widely and narrowly spaced letters under cued and uncued conditions.

    • Main Results:

    • Standard crowding manipulations (reduced spacing, added flankers) significantly impaired uncued change detection.
    • These crowding manipulations had no significant effect on cued change detection.
    • Cued performance was immune to crowding, regardless of spacing or flankers.

    Conclusions:

    • Cued performance escaping crowding supports a top-down attentional account.
    • Alternatively, the ease of the cued task may allow tolerance for feature degradation, rendering observers immune to crowding (a bottom-up explanation).
    • The change detection task's sensitivity reveals degraded memory traces affected by crowding.