The tilt and size aftereffects both illustrate:

a. that percepts are likely mediated by the collective activity at ensembles of neurons

b. that adaptation to patterns causes selective changes in sensitivity in certain neurons

c. that there must exist neurons selective for various sizes and orientation

d. all of the listed answers are correct

d. all of the listed answers are correct

Explanation:

The tilt and size aftereffects both illustrate the following

that percepts are likely mediated by the collective activity at ensembles of neurons that adaptation to patterns causes selective changes in sensitivity in certain neurons that there must exist neurons selective for various sizes and orientation