In a healthy brain, adjacent microtubules are connected by

a. microfilaments.
b. neurofilaments.
c. tau proteins

Auditory images remain in the sensory register for about ________

a. a half second. b. two seconds. c. thirty seconds. d. one minute.

A negative correlation between two factors means that their values move _____

a) in opposite directions. b) in the same direction. c) down. d) with no relationship.