as someone who likes to run for the sheer joy of running and not because they need to do it for exercise or because they want to brag about it. Peak flow can be different for each person. It could take an individual years to reach flow or only moments. If an individual becomes too good at an activity they can become bored. If the challenge becomes too hard then the individual could become discouraged and want to quit. Behaviorist theories While many theories on motivation have a mentalistic perspective, behaviorists focus only on the observable behavior and the theories founded on experimental evidence. In the view of behaviorism, motivation is understood as a question about what factors cause, prevent, or withhold various behaviors, while the question of, for instance, conscious motivation would be ignored. Where others would speculate about such things as values, drives, or needs, that may not be observed directly, behaviorists are interested in the observable variables that affect the type, intensity, frequency, and duration of the observable behavior. Through the basic research of such scientists as Pavlov, Watson and Skinner, several basic mechanisms that govern behavior have been identified. The most important of these are classical conditioning and operant conditioning. Classical and operant conditioning In classical (or respondent) conditioning, behavior is understood as responses triggered by certain environmental or physical stimuli. They can be unconditioned, such as in-born reflexes, or learned through the pairing of an unconditioned stimulus with a different stimulus, which then becomes a conditioned stimulus. In relation to motivation, classical conditioning might be seen as one explanation as to why an individual performs certain responses and behaviors in certain situations. For instance, a dentist might wonder why a patient does not seem motivated to show up for an appointment, with the explanation being that the patient has associated the dentist (conditioned stimulus) with the pain (unconditioned stimulus) that elicits a fear response (conditioned response), leading to the patient being reluctant to visit the dentist. In operant conditioning, the type and frequency of behavior are determined mainly by its consequences. If a certain behavior, in the presence of a certain stimulus, is followed by a desirable consequence (a reinforcer), the emitted behavior will increase in frequency in the future, in the presence of the stimulus that preceded the behavior (or a similar one). Conversely, if the behavior is followed by something undesirable (a punisher),