What do we call the electrical charge of a neuron when it is not firing?

According to the theory about the impact of the social clock of adult life events, which of the following individual patterns is associated with the most upheaval or disruption or personal difficulty—at least for current cohorts?

a. having your parents both die when you are in your 20s b. having a first child at age 30 c. receiving your last work promotion at age 40 d. retiring at age 65

Research on the biology of memory involving the visual cortex of rats reared in stimulating environments and the stimulation of certain synapses in sea snails, such as Aplysia, suggests that

a. the engram is generalized throughout the entire cortex. b. myelination is not critical to memory formation in the brain. c. electrical circuits in the brain correspond to memory traces. d. memories may have neural correlates at specific sites.