Multiple object individuation during numerical Stroop

Silvia Pagano, Veronica Mazza
Psychophysiology 2013, 50 (3): 292-6
To investigate whether semantic information relative to numbers is retained during multiple object individuation, we recorded N2pc--a neural measure of selection/individuation--during a numerical version of the Stroop task. Participants enumerated a varying number of target digits (1 to 4) whose identity was either congruent or incongruent with their numerosity. N2pc amplitudes increased as a function of target numerosity but were little affected by congruency, suggesting that multiple object individuation is a prenumeric stage that does not encode for the number magnitude of the numerosity of the individuated objects.

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