Nov 2, 2018

Grouping effects in numerosity perception under prolonged viewing conditions

BioRxiv : the Preprint Server for Biology
Leo PoomRonald van den Berg

Abstract

Humans can estimate numerosities - such as the number sheep in a flock - without deliberate counting. A number of biases have been identified in these estimates, which seem primarily rooted in the spatial organization of objects (grouping, symmetry, etc). Most previous studies used static stimuli with extremely brief exposure times. However, outside the laboratory, visual scenes are often dynamic and freely viewed for prolonged durations (e.g., a flock of moving sheep). The purpose of the present study is to examine the effect of grouping on perceived numerosity in stimuli that more closely mimic these conditions. To this end, we designed two experiments with limited-dot-lifetime displays (LDDs), in which each dot is visible for a brief period of time and replaced by a new dot elsewhere after its disappearance. The dynamic nature of LDDs prevents subjects from counting even when they are free-viewing a stimulus under prolonged presentation. Subjects estimated the number of dots in arrays that were presented either as a single group or were segregated into two groups by proximity, dot size, color, or motion. Grouping by color and motion reduced perceived numerosity compared to viewing them as a single group. Moreover, the groupi...Continue Reading

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Mentioned in this Paper

Study
Size
Laboratory
Sheep antigen
Domestic Sheep
Mimic brand of tebufenozide
Sheep
Perception
Symmetry
Proximal

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