active shifts of attention. However, recent research has questioned this conclusion by finding that attention also affects subitizing.

Imaging enumeration

A further source of research on the neural processes of subitizing compared to counting comes from positron emission tomography (PET) research on normal observers. Such research compares the brain activity associated with enumeration processes inside (i.e., 1-4 items) for subitizing, and outside (i.e., 5-8 items) for counting.

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