title: Statistical regularities reduce perceived numerosity.
abstract: Numerical information can be perceived at multiple levels (e.g., one bird, or a flock of birds). The level of input has typically been defined by explicit grouping cues, such as contours or connecting lines. Here we examine how regularities of object co-occurrences shape numerosity perception in the absence of explicit grouping cues. Participants estimated the number of colored circles in an array. We found that estimates were lower in arrays containing colors that consistently appeared next to each other across the experiment, even though participants were not explicitly aware of the color pairs (Experiments 1a and 1b). To provide support for grouping, we introduced color duplicates and found that estimates were lower in arrays with two identical colors (Experiment 2). The underestimation could not be explained by increased attention to individual objects (Experiment 3). These results suggest that statistical regularities reduce perceived numerosity consistent with a grouping mechanism.
authors.affiliation: Department of Psychology, University of British Columbia, Canada; Institute for Resources, Environment and Sustainability, University of British Columbia, Canada. Electronic address: jiayingz@psych.ubc.ca.
authors.forename: Jiaying
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Department of Psychology, University of British Columbia, Canada.
authors.forename: Ru Qi
authors.initials: RQ
authors.lastname: Yu
mesh_terms: D000328:Adult; D001288:Attention / Q000502:physiology*; D003118:Color Perception / Q000502:physiology*; D005260:Female; D006801:Humans; D007858:Learning / Q000502:physiology*; D008297:Male; D055641:Mathematical Concepts; D010364:Pattern Recognition, Visual / Q000502:physiology*; D011337:Probability Learning; D055815:Young Adult
keywords: Attention; Grouping; Implicit learning; Numerosity estimation; Statistical learning