 This accelerating function is largely descriptive, and often justified by learning time, prey switching, or a combination of both phenomena, but the type III functional response lacks the rigorous theoretical underpinning of the type II functional response.Learning time is defined as the natural improvement of a predator's searching and attacking efficiency or the natural improvement in their handling efficiency as prey density increases.Imagine a prey density so small that the chance of a predator encountering that prey is extremely low.