Which pair of transmitters are the primary excitatory and inhibitory (respectively) transmitters in the brain?

During the stage of two-word speech, children use wh- words when asking questions

Indicate whether the statement is true or false

A witness claimsthat his robber has a gun, although later examination of the surveillance video shows that this was not true. The witness's perception of the event was likely influenced by ____.?

a. ?grouping principles b. ?the simplicity principle c. ?bottom-up processing d. ?schemas