Learning- process by which experience produces a relatively enduring change in an organism"s behaviour or capabilities. 1)habituation, sensitization- change in behaviours that results from repeated exposure to a single stimulus: 2 conditioning that involve learning associations between events. Classical conditioning: two stimuli become associated with each other (e. g. seeing a dog and being bitten- seeing a dog[stimulus] fear[response]) Habituation: decrease in the strength of response to a repeated stimulus. Simplest form of learning key adaptive function. Sensitization: increase in the strength of response to a repeated stimulus occur to strong or noxious stimuli (increase responses to a potentially dangerous stimulus) found across a wide range of species (both) Classical conditioning: an organism learns to associate two stimuli (song and present event), one stimulus (the song) comes to produce a response (feeling happy) that was originally produced only by the other stimulus (present event) Basic form of learning that occurs in mammal.