Most children need help with __________ until about 9 years of age

Drugs that block the operation of a neurotransmitter are called

a) agonists. b) antagonists. c) opioid peptides. d) neuromodulators.

Berko's (1958) research on children's understanding of morphology indicated that

A) preschoolers and first graders can form correct plurals and past tenses of nonsense words. B) first graders can form correct plurals of nonsense words, but they cannot create past tenses. C) children's understanding of plurals and tenses for nonsense words does not develop until they have achieved formal operations. D) first graders can form correct plurals of tangible, concrete objects, but not of imaginary objects.