The age at which stuttering tends to recede is around ____.
a. 2 years
b. 5 years
c. 9 years
d. 10 years
Question 2
Studies investigating the causes of communication disorders suggest that ____.
a. there is no genetic basis for language problems
b. left-handed people are more likely to develop language impairments
c. communication problems are often tied to poor parental efforts to stimulate language development
d. there is an interaction of genetic influences, slowness of brain maturation, and possible minor brain lesions
A levallois core from Kapedo Tuffs, Kenya dates about 130,000 years ago.
Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f
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