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J Vis. 2014 Oct 7;14(6). pii: 4. doi: 10.1167/14.6.4.

Foveal target repetitions reduce crowding.

Author information

1
Laboratory of Experimental Psychology, University of Leuven, Leuven, Belgium Université Paris Descartes, Sorbonne Paris Cité, Paris, France CNRS UMR 8158, Paris, France.
2
Université Paris Descartes, Sorbonne Paris Cité, Paris, France CNRS UMR 8158, Paris, France Experimental Psychology, University College London, London, UK.
3
Université Paris Descartes, Sorbonne Paris Cité, Paris, France CNRS UMR 8158, Paris, France.

Abstract

Crowding is the limitation of peripheral vision by clutter. Objects that are easily identified when presented in isolation are hard to identify when presented flanked by similar close-by objects. It is often assumed that the signal of a crowded target is irretrievably lost because it is combined with the signals of the flankers. Here, we asked whether a target signal can be enhanced (or retrieved) by items presented far outside the crowding region. We investigated whether remote items matching a peripheral, crowded target enhanced discrimination compared to remote items not matching the target. In Experiment 1, we presented the remote item at different locations in the visual field and found that, when presented in the fovea, a matching remote item improved target discrimination compared to a nonmatching remote item. In Experiment 2, we varied stimulus onset asynchronies between target and remote items and found a strong effect when the remote item was presented simultaneously with the target. The effect diminished (or was absent) with increasing temporal separation. In Experiment 3, we asked whether semantic knowledge of a target was sufficient to improve target discrimination and found that this was not the case. We conclude that crowded target signals are not irretrievably lost. Rather, their accurate recognition is facilitated in the presence of remote items that match the target. We suggest that long-range grouping mechanisms underlie this "uncrowding" effect.

KEYWORDS:

crowding; cueing; grouping; long-range interaction; masking; peripheral vision; similarity; uncrowding; unmasking

PMID:
25294741
DOI:
10.1167/14.6.4
[Indexed for MEDLINE]

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