Gross motor skills are defined by

In manipulating independent variables, which types of variables involve physical changes produced within the participant's body via the administration of drugs or surgical manipulations?

a. Environmental variables b. Instructional variables c. Task or activity variables d. Invasive variables

Suppose a newborn sucks to hear its father's voice. When the response habituates, the experimenters substitute a different man's voice. What do we infer if the sucking rate remains the same? The newborn hears a difference between the voices. a. The newborn prefers the sound of women's voices

b. The newborn prefers the sound of the father's voice. c. The newborn does not hear a difference between the voices. d. The newborn hears a difference between the voices.