Which type of receptors appear to exert primarily inhibitory feedback actions on neurons?

The amyloid plaques and neurofibrillary tangles that are typical in Alzheimer's disease are also found in people with

a. schizophrenia. b. Down syndrome. c. Parkinson's disease. d. Korsakoff's syndrome.

When newborns hear a sound, they increase their sucking. After some repetitions of the sound, their sucking decreases. If a change in the sound increases their sucking, we say that it produced _________________

Fill in the blank(s) with correct word