Non-associative learning can be divided into habituation and sensitization. On the other side of habituation is sensitization. Also another challenge that comes with habituation is the dichotomy of novelty vs familiar stimuli. It usually is explained by things such as conditioned inhibition, habituation, or extinction. The amygdala is one of the most-studied areas of the brain in relation to habituation. Prenatal learning often is examined by using the habituation paradigm. A third account concerns non-associative mechanisms such as habituation, modulation and response fatigue. Pathological lying can be described as a habituation of lying. However, overexposure is possible, leading to a loss of credibility and habituation. Exposure based therapy works under the principle of habituation that is derived from learning theory. Some habituation procedures appear to result in a habituation process that last days or weeks. However, recent excavations in the dunes of Kennemerland show clear evidence of a continuous habituation. Birds show varying degrees of habituation to pyrotechnics. Habituation procedures are used by researchers for many reasons. This is considered long-term habituation.