ISO is the sensitivity of your sensor to light. The ISO setting you use depends on the amount of light in the scene you are photographing. The more light you have to work with the lower you can set your ISO.
Each side of your brain contains four lobes. The frontal lobe is important for cognitive functions and decision-making. The parietal lobe processes information about temperature, taste, touch and movement, and spatial orientation. The occipital lobe is primarily responsible for vision.
Occipital Lobe (located behind the temporal and parietal lobes) - Responsible for the processing of visual information. Damage to this area results in partial or complete blindness. Limbic Lobe (located around the junction of the cerebral hemisphere with the brain stem) - It is involved in the emotional and sexual aspects of behavior and in the processing of memory.