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 benefitted greatly from experimentation and observation of food caching birds. To study auditory learning and memory, songbirds can be used. To study more complex systems such as motor learning, object recognition, short term memory and working memory, often primates such as the macaque monkey are used because of their large brains and more sophisticated intelligence. Small rodents can be used to study aversive conditioning and emotional memory, and contextual/spatial memory. To reduce memory and learning to its genetic basis, mice can be genetically modified and studied. Generally animal studies depend on the principles of positive reinforcement, aversion techniques and Pavlovian