A voluntary action
is one that is produced because of conscious choice of the organism. The organism, would in turn also be aware of the action while it is executed. This is the opposite of involuntary action
, which occurs without the free will of the organism. When this involuntary action occurs in response to a specific stimulus
that may arise outside the body (e.g., sudden glare that would result in closing of the pupil
) or inside the body (e.g., or widening of the pupil that might occur with excitement or anxiety). Thus, an involuntary action need not be a reflex if it is not a direct response to a stimulus, e.g., alternate contraction and relaxation of skeletal muscles
during a "fit" (seizure
). Another distinction is that reflexes tend to have a protective value for the organism, and seen in all members of a species
, but involuntary movements.
Some responses are involuntary, but may be also generated by free will, like blinking of the eyelids and respiratory movements.