After Damage to the Visual Cortex, a Rat No Longer

Multiple Choice

After damage to the visual cortex, a rat no longer approaches the white card it has been trained to approach. What is the evidence that the rat has not completely forgotten the task?

A) It can relearn the task faster than it can learn to approach a black card.
B) After a delay, it spontaneously regains the memory and approaches a white card.
C) After several unreinforced sessions, it begins responding correctly.
D) Its heart rate increases when looking at a white card but not when looking at a black card.