The earliest scientific studies in social psychology on persuasion were conducted by ____

An undersupply of the major inhibitory neurotransmitter known as ________ is linked to seizures.

a. glutamate b. GABA c. serotonin d. ACh

When the number of groups is greater than 3, ______ counterbalancing is most commonly used to control for possible order effects.

A. complete B. partial C. grouped D. sequential