The "focus on neuroscience" feature described a study in which participants memorized labels for common objects, such as "dog," that were paired with either a picture or a sound. when they retrieved the memory, participants who had memorized the word dog with a picture of a dog showed a level of activation in the cortex.

A high level of activation in the visual cortex.

Explanation:

 The visual cortex is the part of cerebral cortex in the brain that helps to process the visual information. It is basically located in the occipital lobe in our brain. It helps in the visual part where the visual brain that run straight to the primary visual cortex in our eyes.

The visual part is the central nervous system that manage the ability of the visual detail in the form of sight. It also enable the various non image response covert into some meaningful function.