Final answer:
The topographic expansion associated with perceptual skill learning depends on the sensory system involved, such as the visual system. During visual skill learning, the neural representation of the learned skill expands in the primary visual cortex.
Step-by-step explanation:
The topographic expansion that is associated with perceptual skill learning depends on the primary sensory system involved. In the case of visual skill learning, the expansion occurs in the visual system.
The topographic expansion refers to the increase in the size and specificity of the neural representation of the learned skill in the relevant sensory cortex.
For example, in the visual system, the primary sensory cortex responsible for processing visual information is the primary visual cortex (V1). When learning a visual skill, such as recognizing faces, the neural representation of the specific facial features expands within the V1, leading to improved perceptual ability.