Greg was a world-class diver until he hit his head on the diving board during one of his dives. He now has difficulty coordinating the movements required for various tucks and rotations. It is likely that when he hit his head on the diving board, Greg damaged his .

cerebellum

Explanation:The part of gregs brain that got damaged is the cerebellum (located at the base of the skull where the head meets the neck ). This is because it is the cerebellum that is responsible for motor movement and voluntary actions like balance and coordination required for muscular control and as stated he could not coordinate the necessary movement( voluntary actionns) required for him to dive.

i believe the answer is:   psychological  experiment

in this experiment, wilhelm wundt became the first person that implement scientific method in analyzing the pyschological phenomenon.

due to this result, wilhelm wundt also able to make psychology to be acknowledged as a separate scientific field from biology.

when your a dog and you need a bone.   go and eat a rabbit