Eleanor suffered severe stroke damage near the rear of both sides of her brain where her feature detection cells are located. she is unable to:

The process of the detection of the natural stimuli by the nervous system of a person's body is known as feature detection. The feature detection cells are the group of neurons or a single neuron that has the code for any particular significant stimuli. The feature detection cells located near the rear side of a person's brain, when damaged will disable the ability of the person to perceive movements.

Hence, the answer is 'unable to perceive movements'.