Editing Subitizing (section)

===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.<ref name="corbetta"/><ref name="Piazza"/>

Such research finds that within the subitizing and counting range activation occurs bilaterally in the occipital extrastriate cortex and superior parietal lobe/intraparietal sulcus. This has been interpreted as evidence that shared processes are involved.<ref name="Piazza"/> However, the existence of further activations during counting in the right inferior frontal regions, and the [[anterior cingulate]] have been interpreted as suggesting the existence of distinct processes during counting related to the activation of regions involved in the shifting of attention.<ref name="corbetta"/>