Popper considered Freud's psychoanalytic theories to be _______ because no matter what happened, the psychoanalyst could claim that the observed behavior supported the theory.

In 1937, Ramón y Cajal observed __________ under a microscope and referred to them as "protoplasmic kisses."

a. synaptic vesicles b. dendrites c. nodes of Ranvier d. synapses

Which major structure of the brain is responsible for receiving and directing most sensory input to the different lobes of the cerebral cortex?

a. The corpus callosum b. The thalamus c. The hypothalamus d. The limbic system