behavior subject to operant conditioning, and involuntary behavior is everything else. it might be clearer to define voluntary behavior as fully transparent to reinforcement.
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dr. petrovic is most likely a positive therapist, since his goal is to his clients channel their motivation for positive growth and to realize their potential, he's most likely an adept of positive psychology. the field is structured on the belief that people want to lead meaningful and fulfilling lives, to cultivate what is best within themselves, and to enhance their experience of love, work and play.