In 2010, Dale, Harlaar, Haworth, and Plomin completed a twin study in which they found evidence suggesting an important role for heredity in the ease with which adolescents learn a second language. Given this,
a. skill in foreign language was more similar among fraternal twins than among identical twins.
b. skill in foreign language was more similar among identical twins than among fraternal twins.
c. skill in foreign language was equal among fraternal and identical twins.
d. skill in foreign language cannot be evaluated using a twin study.
b
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Why is research on language comprehension easier to conduct than research on language production?
a. Language comprehension occurs more frequently than language production. b. Language comprehension can be studied with participants of all ages, whereas language production can only be studied in older children and adults. c. Language comprehension is more overt, whereas language production is more covert. d. It is easier to manipulate a variable that can influence language comprehension than it is to manipulate a variable that can influence language production.
In children, private speech is usually silent
Indicate whether this statement is true or false.