Definition - What does System Unit mean? A system unit is the part of a computer that houses the primary devices that perform operations and produce results for complex calculations. It includes the motherboard, CPU, RAM and other components, as well as the case in which these devices are housed. This unit performs the majority of the functions that a computer is required to do.
size constancy - the tendency to perceive the veridical size of a familiar object despite differences in their distance (and consequent differences in the size of the pattern projected on the retina of the eye)
The law of primacy states that students retain information they  learn for the first time longer then they retain information they  must relearn. Unlearning bad habits is al â¦ ways harder than learning  the right way in the first place.he primacy effect results in information presented earlier being b â¦ etter remembered than information presented later on. The recency effect results in better recall of the most recent information presented.