Preserving food, less fighting for food, less roaming to hunt and gather. More stable sense of community. More children. Preserving food, less fighting for food, less roaming to hunt and gather. More stable sense of community. More children.
Contrast sensitivity is the ability of an imaging process to produce an image of objects or tissues in the body that have relatively small physical differences or inherent contrast. The contrast that is to be imaged is in the form of some specific physical characteristic.
Rayleigh criterion: two optical images are separable if central bright spot of one image falls on first dark band of second. Real image: optical image at which rays from object converge. Receiver: device that detects electromagnetic waves.