Which of the following is an example of positive feedback?
a. breathing and heart rate increase as a person climbs a set of stairs
b. sweating when hot so that as sweat evaporates the body is cooled
c. the increase in milk production while a mother is nursing her infant
d. constriction of the pupils when the eyes are exposed to bright light

A. breathing and heart rate increase as a person climbs a set of stairs

Explanation:

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.