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Attention drives human numerosity-selective responses.

Yuxuan Cai1, Shir Hofstetter2, Ben M Harvey3

  • 1Spinoza Centre for Neuroimaging, Meibergdreef 75, 1105BK Amsterdam, the Netherlands; Computational Cognitive Neuroscience and Neuroimaging, Netherlands Institute for Neuroscience, Amsterdam, the Netherlands; Experimental and Applied Psychology, Vrije University Amsterdam, Amsterdam, the Netherlands.

Cell Reports
|June 29, 2022
PubMed
Summary
This summary is machine-generated.

Attention is crucial for the brain to process the number of items (numerosity). Focusing attention on specific visual elements, like colored dots, drives numerosity-selective neural responses, otherwise these responses are suppressed.

Keywords:
CP: NeuroscienceattentionfMRInumerosity-selective responsesuppressionultra-high field

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Neuroimaging

Background:

  • Numerosity, the perception of item quantity, guides behavior and decisions.
  • Neural populations exhibit selective responses to different numerosities.
  • The mechanism of visual numerosity extraction remains debated, involving low-level vision and high-level cognition.

Purpose of the Study:

  • To investigate the influence of attention on numerosity-selective neural responses.
  • To determine if attention is necessary for the brain to process quantity.

Main Methods:

  • Utilized 7 Tesla functional magnetic resonance imaging (7T fMRI).
  • Presented stimuli with varying numerosities of black and white dots.
  • Manipulated participants' attention to focus on either black or white dots.

Main Results:

  • Numerosity-tuned neural populations responded selectively only when attention was directed to their preferred numerosity.
  • Responses to preferred numerosity were suppressed when attention was not focused.
  • Attention was required to drive numerosity-selective responses, not merely enhance them.

Conclusions:

  • Attention plays a critical role in enabling numerosity-selective neural processing.
  • Unlike traditional attention effects, attention is necessary to initiate, not just modulate, numerosity responses.
  • This finding offers new insights into the cognitive mechanisms underlying quantity perception.