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'''Behavior''' or '''behaviour''' (see [[American and British English spelling differences#-our .2F -or|spelling differences]]) refers to the [[action (philosophy)|action]]s or [[reaction]]s of an [[object (philosophy)|object]] or [[organism]], usually in [[relation]] to the [[natural environment|environment]]. Behavior can be [[conscious]] or [[Unconscious mind|unconscious]], [[overt]] or [[covert]], and [[voluntary]] or involuntary. In animals, behavior is controlled by the [[endocrine system]] and the [[nervous system]]. The complexity of the behavior of an organism is related to the complexity of its nervous system. Generally, organisms with complex nervous systems have a greater capacity to learn new responses and thus adjust their behavior.

'''Behavior''' or '''behaviour''' (see [[American and British English spelling differences#-our .2F -or|spelling differences]]) refers to the [[action (philosophy)|action]]s or [[reaction]]s of an [[object (philosophy)|object]] or [[organism]], usually in [[relation]] to the [[natural environment|environment]]. Behavior can be [[conscious]] or [[Unconscious mind|unconscious]], [[overt]] or [[covert]], and [[voluntary]] or involuntary. In animals, behavior is controlled by the [[endocrine system]] and the [[nervous system]]. The complexity of the behavior of an organism is related to the complexity of its nervous system. Generally, organisms with complex nervous systems have a greater capacity to learn new responses and thus adjust their behavior.

[[Human behavior]] (and that of other [[organism]]s and mechanisms) can be common, unusual, acceptable, or [[deviant behavior|unacceptable]]. Humans evaluate the [[taboo|acceptability]] of behavior using [[social norm]]s and regulate behavior by means of [[social control]]. In [[sociology]], behavior is considered as having no meaning, being not directed at other people and thus is the most basic human [[Action (philosophy)|action]]. Animal behavior is studied in [[comparative psychology]], [[ethology]], [[behavioral ecology]] and [[sociobiology]].

[[Human behavior]] (and that of other [[organism]]s and mechanisms) can be common, unusual, acceptable, or [[deviant behavior|unacceptable]]. Humans evaluate the [[taboo|acceptability]] of behavior using [[social norm]]s and regulate behavior by means of [[social control]]. In [[sociology]], behavior is considered as having no meaning, being not directed at other people and thus is the most basic human [[Action (philosophy)|action]]. Animal behavior is studied in [[comparative psychology]], [[ethology]], [[behavioral ecology]] and [[sociobiology]].