At about ____ an infant's visual acuity is strong enough to discriminate facial features and emotions at further distances

Disruption of the hypocretin gene produces symptoms of narcolepsy

Indicate whether the statement is true or false.

What happens when a discriminative stimulus is present?

a. it has no influence over the behavior b. it makes the behavior less likely to occur c. it inhibits the behavior d. it makes the behavior more likely to occur