Two non-verbal cognitive systems, an approximate number system (ANS) for extracting the numerosity of a set and a parallel individuation (PI) system for distinguishing between individual items, are hypothesized to be foundational to symbolic number and mathematics abilities. However, the exact role of each remains unclear and highly debated. Here…

The structure of cognitive abilities was examined through tests administered to 81 prelingually deaf Yougoslavian children (ages seven to eight). Results suggested the existence of two levels of cognitive organization: (1) automatic (involving highly integrated perceptual skills and short-term memory); and (2) representational (involving symbols…

Visual and auditory stimuli were presented to children to measure symbol processing abilities. Slides which required matching the similarities in two objects in a group of three were presented. At times the matching criteria varied between function, color, and form. Reaction time was quicker when matching by color than by function, which was…