Familial correlations in the judgment of numerousness.
Results from analyses of 100 families' judgments of 5 to 90 dots suggest that the absolute error in "subtizing" (up to 8 objects) may have a genetic component. "Estimating" larger numbers of items is more complex and, in this study, does not seem to be under genotypic control.
D005190:Family; D005260:Female; D005796:Genes; D006801:Humans; D007600:Judgment; D008297:Male; D014796:Visual Perception