Individuation of objects and object parts rely on the same neuronal mechanism.

Helmert contrasts showed that N2pc increased with the number of object parts: N2pc amplitude was smaller for 1-part stimuli compared to higher numerosities (F(1,13) = 30.57, p = 0.0001, p η 2 = 0.70), for 2-parts objects compared to higher numerosities (F(1,13) = 18.48, p = 0.001, p η 2 = 0.59), and close to significance when comparing the N2pc amplitude for 3-parts objects to the mean N2pc amplitude for 4- and 5-parts stimuli (F(1,13) = 3.87, p = 0.07, p η 2 = 0.23).

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