Parents of children with autism spectrum disorder (ASD) frequently report that they were “difficult babies.”

In the sixth sub stage of Piaget’s sensor I motor period, external exploration is replaced by mental exploration.

Which theorist described children’s attempts to learn about their environments as “experiments in order to see”?

Infants prefer infant-directed speech over adult talk.

By what age will a child demonstrate tertiary circular reactions?

During which stage of cognitive development would you witness a tertiary circular reaction?

Before puberty, children suffering left hemisphere injuries frequently recover much of their speaking ability.

Infant IQ scores reliably predict adult IQ scores.

By what age will a child demonstrate coordination of secondary schemes?

The mean length of utterance (MLU) is the average number of morphemes used in a sentence.