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Antonella Pomè1, Camilla Caponi1, David C Burr1,2

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Frontiers in Human Neuroscience
|October 25, 2021
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Visual attention and perceptual grouping interact to influence how we perceive numbers. Engaging attention in a task reduces grouping effects on perceived numerosity, independent of autistic traits.

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Area of Science:

  • Cognitive psychology
  • Visual perception
  • Neuroscience

Background:

  • Perceptual grouping and visual attention are key for object segregation.
  • Perceptual grouping influences perceived numerosity, often leading to underestimation.
  • Individual differences, such as autistic traits, may affect these perceptual processes.

Purpose of the Study:

  • To investigate how engaging visual attention affects perceptual grouping biases in numerosity estimation.
  • To examine the relationship between autistic traits and numerosity perception under varying attentional demands.

Main Methods:

  • Participants judged the numerosity of connected dot pairs under free viewing and divided attention conditions.
  • A concurrent color conjunction task was used to divide visual attention.
  • Autistic traits were assessed using the Autism Spectrum Quotient (AQ).

Main Results:

  • Divided attention significantly reduced the underestimation bias caused by perceptual grouping.
  • The correlation between AQ scores and numerosity bias was strong under free viewing but reduced with divided attention.
  • The effect of divided attention on grouping-induced biases was independent of participants' perceptual style.

Conclusions:

  • Divided attention modulates the influence of connectedness on perceptual grouping.
  • The impact of attentional load on perceptual grouping is not solely dependent on individual perceptual styles or autistic traits.