Answer:
an expectancy effect.
Step-by-step explanation:
This phenomenon is the Expectancy effect. Which happens due to an erronous belief held by the students (the perceivers) about drinking alcohol (the target), which led the students or perceivers to act in such a manner so as to get the expected effect from the target (alcohol). The students resorted into drinking alcohol thinking it would have positive effects on their social behavior and cognitive and motor skills.