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Related Experiment Videos

Object substitution masking and its relationship with visual crowding.

Sarah Jayne Camp1, Michael Pilling2, Angus Gellatly2

  • 1Psychology, Oxford Brookes University, Oxford, OX3 0BP, UK. s.camp@brookes.ac.uk.

Attention, Perception & Psychophysics
|April 8, 2017
PubMed
Summary

Object substitution masking (OSM) amplifies visual crowding, especially at intermediate target-flanker distances. This interaction suggests shared underlying neural mechanisms between masking and crowding effects.

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Area of Science:

  • Cognitive Psychology
  • Visual Perception
  • Neuroscience

Background:

  • Object substitution masking (OSM) reduces target visibility via a trailing mask.
  • Previous research indicated OSM and visual crowding interact synergistically.
  • The precise nature of this interaction and its underlying mechanisms remain unclear.

Purpose of the Study:

  • To investigate the interaction between object substitution masking (OSM) and visual crowding.
  • To determine whether OSM influences crowding or vice versa.
  • To explore the role of target-flanker distance and mask duration in this interaction.

Main Methods:

  • Three experiments were conducted using a digit identification task.
  • Target-flanker distance was systematically manipulated.
Keywords:
CrowdingFlankersObject substitution masking

Related Experiment Videos

  • Mask duration was varied, and the OSM effect was measured by comparing performance in masked versus unmasked conditions.

    • Main Results:

    • The OSM effect exhibited a quadratic relationship with target-flanker distance.
    • OSM appeared to amplify crowding, particularly at intermediate target-distractor distances.
    • This amplification occurred at the boundary of the crowding interference zone.

    Conclusions:

    • Object substitution masking (OSM) significantly influences visual crowding, rather than the reverse.
    • The findings suggest that OSM and crowding share common underlying neural mechanisms.
    • OSM may alter feature detector pooling during target identification when competing with both a mask and flankers.