Most axons (approximately _____ per cent ) of the optic nerve end at the lateral geniculate nucleus.

Greti's little girl is deaf and, therefore, we would expect that she would

not communicate until she has speech therapy. babble several months earlier than hearing children. babble manually at about the same time normal children babble. learn sign language about 6 months later than hearing children begin to speak.

Systematic desensitization is based on

a. counterconditioning. b. operant conditioning. c. stimulus generalization. d. spontaneous recovery.