Janet had a stroke and lost the capacity to perceive motion but retained the capacity to perceive shapes and colors. George also had a stroke and lost the capacity to perceive colors but retained the capacity to perceive movement and form. These peculiar visual disabilities best illustrate our normal capacity for:

Parallel processing

Explanation:

Parallel processing is the ability of the brain to process many information of differing quality  at once.this process involves analyzing and distributing the receive stimulus into four compartments : Color, shape, motion,depth.

George stroke made him to lost the capacity to perceive colors but retained the capacity to perceive movement and form

Janet had a stroke and lost the capacity to perceive motion but retained the capacity to perceive shapes and colors.

The disability in the question are typical type of the four compartment of Parallel processing

answer; ///i believe the correct answer is (b) the writing of the ancients who lived in india after the indus valley inhabitants died out;

i am pretty sure it is d.