Humans can detect differences in the frequencies of sounds as small as:

The more effort a behavior requires, the fewer times the behavior will be performed during extinction

Indicate whether the statement is true or false

Erikah, an infant and toddler teacher, loves to watch how babies grasp objects. She has noticed that at first babies attempt to grasp objects using a whole hand, but by the end of the first year they are able to grasp objects with just the forefinger and

thumb. Erikah is observing __________. a) physical development b) cognitive development c) personality development d) social development