This is the switchboard of the brain. Another reason this region will collect more stress is that cells communicate their state to the other cells that receive their impulses. Should another region of the brain be abnormally stressed through trauma, disorder, genetics or whatever, the emotional switchboards will be the region receiving the most impulses from this region of the brain as opposed to the other regions that are not as well connected, so some of that stress will transfer over to the emotional center as well. These regions with the most connections from the greatest variety of regions of the brain are also the places where a lot of information routes from one center to another. If a conglomeration of regions of the brain is receiving impulses from throughout the brain, those other parts of the brain are not as well connected to each other as they are to this switchboard of the brain, so these other parts send information to each other through the switchboard.
Vision can coordinate with hearing, but mostly through the emotional center paths.
This is the region of the brain that will be the most likely to attract stress. We can identify what these regions are later in terms of medical terminology. The development of language radically changes the nature of the wiring of the brain. Your brain will cover an enormous amount of information with that simple and singular word. The many images of different cups that have been in your presence will be experienced at the same time in the visual centers of the brain.