Many of the features of human cognition can be found in animals as well. These include perception, motor behavior, and memory. But there are also substantial differences between human and animal cognition. Animals, primates included, do not engage in science or philosophy. These are unique human inventions. And yet, we do these things with a brain that has many features in common with animal brains, in particular that of mammals. These similarities are even more striking in case of the neocortex, which is in particular involved in cognitive processing. It is a task requiring some experience to tell a histological section of the mouse cortex from a human one. Now, it is hazardous to directly relate brain size to cognitive abilities. But the size of the neocortex is a different matter. There seems to be a direct relation between the size of the neocortex and cognitive abilities. For example, the size of the human neocortex is about four times that of chimpanzees, our closest relatives. This difference is not comparable to the difference in body size or weight between humans and chimpanzees.

According to the passage, which of the following is the main difference between a human neocortex and a chimpanzee neocortex?

A. shape
B. cellular structure
C. ability
D. histology
E. memory