If you are at all interested in how the brain or mind works, for example if you study psychology, neuroscience or philosophy of mind, then you ought to know about place cells.
Images: Image 1 shows the path of a rat moving around a rectangular box (black line). Red squares show where a place cell fires. Image 2 shows the average firing rate of the cell at each location in the rectangular box – “hotter” colours indicate more rapid firing. Data from O’Keefe lab.