Electroconvulsive therapy has been used successfully to treat ________ that has not responded to other treatments

A(n) _________ period is a time that is optimal for certain capacities to emerge

Fill in the blank(s) with the appropriate word(s).

Which of the following statements is true regarding sustained attention?

A) A greater slowing of heart rate while focused on complex stimuli is a physiological indicator of sustained attention. B) Children are not capable of intentional, goal-directed sustained attention until they enter elementary school. C) Improved language development is responsible for gains in sustained attention. D) Environmental factors have minimal impact on the development of sustained attention.