Weather front areas of precipitation help determine the frontal type and location. There are two different meanings used within meteorology to describe weather around a frontal zone. The term "anafront" describes boundaries which show instability, meaning air rises rapidly along and over the boundary to cause significant weather changes. A "katafront" is weaker, bringing smaller changes in temperature and moisture, as well as limited rainfall. A cold front is located at the leading edge of the temperature drop off, which in an isotherm analysis shows up as the leading edge of the isotherm gradient, and it normally lies within a sharp surface
Methods used to study memory supportive tissue unaffected. Research animals are a good substitute for humans because similar principles are assumed to underlie basic mechanisms of brain function. In order to fully understand human memory, cross-species comparisons in neuropsychology are used so that multiple variables can be manipulated. The more experimental control we have, the easier it is to eliminate confounding variables, and better causal conclusions can be made. Although there is no single "ideal" animal model of a human, for each problem of interest there is an animal upon which it can be most conveniently studied. For example, the study of spatial memory has