Question

if the hog starts running around on the field, what neural code does your visual brain area mt use to tell you the specific angle / vector / direction that the hog is moving?
rate code
population code
sparse code
temporal code

Explanation:

Population code involves the collective activity of a group of neurons to represent information. In the visual brain area MT (middle temporal area), which is involved in motion perception, the specific angle/vector/direction of an object (like the hog) is represented by the population code. Different neurons in MT are tuned to different directions of motion. The combination (population) of their activities (firing rates) encodes the precise direction. Rate code is more about the firing rate of a single neuron representing a parameter (but for direction in MT, it's a population). Sparse code is when only a few neurons are active. Temporal code is about the timing of spikes rather than the population - level direction encoding.

Answer:

population code