What part of the retina has the greatest concentration of photoreceptors, and is therefore associated with the greatest visual acuity?

Information-processing theorists believe that perception

is an automatic human phenomenon. is something everyone experiences in the same basic way. cannot be controlled by the individual. is something each individual experiences in his or her own way.

When her baby begins to cry, Brenda can quickly soothe him by picking him up, holding him, and stroking his head. Based on research with animals

it is likely that Brenda's touch has a soothing effect, in part, because it leads to the release of ___________ in the baby's brain. a. morphine b. endorphins c. leptin d. vasopressin