Psyc 228 Chapter 5 Questions and Answers

Psyc 228 Chapter 5 Questions and Answers Myelination ANSWER the formation of a fatty sheath around the axons of a neuron Synapses ANSWER tiny gaps between dentrites and axons of different neurons. they make possible more complex movements and thinking synaptic pruning ANSWER the elimination of neurons as the result of nonuse or lack of stimulation Between 2 and 6 years of age, the brain gains ___________ to _________ percent of it's adult weight ANSWER 20 to 25% brain volumes of normally functioning children at the same age can differ by as much as ________ % because one Childs brain is growing faster than another ANSWER 50% What makes a great deal of coordination possible ANSWER myelination In particular myelination of the neutrons that link the cerebral cortex to the cerebellum, and area near the brain stem that is vital for balance and fine muscle movements. As neutrons become more _________ during the preschool years, children become more coordinated while running, climbing and jumping. ANSWER myelinated toxin ANSWER harmful substance that causes adverse effects _________ environmental factor that interacts with genes to produce cognitive deficits in children. ANSWER lead poisoning