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A Dual Task Procedure Combined with Rapid Serial Visual Presentation to Test Attentional Blink for Nontargets
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Individual differences in perceptual abilities predict target visibility during masking.

Silvia Pagano1, Veronica Mazza1,2,3

  • 1Center for Mind/Brain Sciences (CIMeC), University of Trento, Corso Bettini 31, Rovereto, 38068, Italy.

The European Journal of Neuroscience
|May 14, 2015
PubMed
Summary

The visual system can individuate multiple objects even in low visibility. However, this ability is stronger in individuals with efficient early perceptual functions, suggesting that segmentation mechanisms reduce masking effects.

Keywords:
event-related potentialshumanindividual differencesoscillationsperceptual maskingvisual selective attention

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception

Background:

  • The visual system can implicitly process single stimuli under low visibility.
  • It is unclear if this extends to more difficult viewing conditions or if early perceptual abilities influence masking sensitivity.

Purpose of the Study:

  • To investigate if multiple object individuation is possible under difficult viewing conditions.
  • To determine if individual differences in early perceptual abilities modulate masking sensitivity.

Main Methods:

  • Two electroencephalography (EEG) experiments involving participants enumerating target elements among distracters.
  • Targets were masked using object-substitution in either single-target (Experiment 1) or all-target (Experiment 2) conditions.
  • Analysis of event-related potentials (N2pc component) and oscillatory activity (lateralized gamma synchronization).

Main Results:

  • The N2pc component, a measure of selective individuation, was modulated by target numerosity in both masked and unmasked trials.
  • This modulation was more pronounced in participants with lower masking effects.
  • Early segmentation mechanisms (lateralized gamma synchronization) were more active in participants with low masking sensitivity.

Conclusions:

  • Multiple object individuation can occur under limited visibility conditions.
  • Individual variations in early perceptual functions, specifically segmentation and individuation, are linked to masking susceptibility.
  • Efficient early perceptual mechanisms reduce the impact of masking, challenging claims about the individuation of effectively masked stimuli.