The Hebb Rule: Repeated transmission of impulses between two neurons leads to permanent facilitation of transmission between these cells. Hebb also described this process: Separate neurons can fire in a circular pattern so that the original neuron is eventually reactivated by another neuron in the pattern. He called this process .

cell assembly

Explanation:

According to Hebb, A cell assembly is comprised by a group of neurones with strong mutual excitatory connections, thus, the definition relies on the inter- relation of structural and physiological properties of nerve cells.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.