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Distinct serial dependence between small and large numerosity processing.

Yue Huang1,2,3, Haokun Li1,2,3,4, Shiming Qiu1,2,3

  • 1School of Psychology, Central China Normal University (CCNU), Wuhan, 430079, China.

Psychological Research
|December 31, 2024
PubMed
Summary
This summary is machine-generated.

Serial dependence effect (SDE) in numerosity processing differs between subitizing and estimation. Subitizing shows asymmetric SDE, while estimation shows symmetric SDE, suggesting distinct underlying mechanisms for number perception.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • The serial dependence effect (SDE) biases current perception towards recent stimuli, potentially aiding visual stability.
  • It is unclear if a single SDE mechanism supports numerosity processing across both subitizing (small numbers) and estimation (large numbers).

Purpose of the Study:

  • To investigate whether subitizing and estimation exhibit distinct SDE patterns and underlying mechanisms.
  • To determine if SDE mechanisms differ in supporting numerical processing across distinct quantity ranges.

Main Methods:

  • Experimental manipulation of numerosity stimuli across subitizing and estimation ranges.
  • Analysis of serial dependence effect (SDE) patterns (symmetric vs. asymmetric) in both numerical ranges.
  • Comparison of SDE characteristics, including processing precision, between subitizing and estimation.

Main Results:

  • Subitizing demonstrated an asymmetric SDE, occurring only when current magnitude was less than the previous.
  • Estimation exhibited a symmetric SDE, present when current magnitude was less than or greater than the previous.
  • A novel SDE with reduced processing precision was observed exclusively in subitizing.

Conclusions:

  • Subitizing and estimation rely on distinct SDE mechanisms, likely due to different perceptual and post-perceptual processes.
  • The findings suggest that temporal hysteresis explains subitizing's asymmetric SDE, while estimation involves both perceptual and post-perceptual factors.
  • Continuity and stability in numerical processing can be dissociated, highlighting the multifaceted nature of SDE in dynamic perception.