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Serial dependence in numerosity perception.

Michele Fornaciai1, Joonkoo Park1,2

  • 1Department of Psychological & Brain Sciences, University of Massachusetts, Amherst, MA, USA.

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|September 23, 2018
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Summary
This summary is machine-generated.

Serial dependence in visual perception creates attractive biases, making current stimuli seem more like previous ones. This study shows these biases in numerosity perception originate in the visual cortex, not the subcortex.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Conscious experience relies on stable perception despite noisy sensory input.
  • Serial dependencies, attractive biases in visual perception, may contribute to perceptual continuity.
  • Previous research observed serial dependence across visual features and neural levels, but its generalization is unclear.

Purpose of the Study:

  • To investigate the behavioral characteristics of serial dependence in numerosity perception.
  • To determine the neural origin of serial dependence in numerosity perception.
  • To explore the spatial localization and attentional modulation of this effect.

Main Methods:

  • Assessed the bias in perceived numerosity of dot-array stimuli using a task-irrelevant inducer stimulus.
  • Compared serial dependence with and without subcortical processing involvement.
  • Examined spatial localization by varying inducer stimulus position.
  • Investigated attentional modulation using different stimulus presentation procedures.

Main Results:

  • Ruled out subcortical processing involvement, indicating serial dependence in numerosity perception originates in the visual cortex.
  • Demonstrated that the serial dependence effect is spatially localized to the inducer stimulus position.
  • Confirmed the effect persists with minimized post-perceptual processing when attention is directed to the inducer.

Conclusions:

  • Serial dependence in numerosity perception exhibits attractive biases.
  • These biases are mediated by spatially localized attentional modulations of early sensory activity in the visual cortex.