Mihaly Csikszentmihalyi

Mihaly Csikszentmihalyi, born in 1934, is a psychology professor, the former head of the department of psychology at the University of Chicago. He is noted for his work in the study of happiness, creativity, subjective well-being, and fun, but is best known as the architect of the notion of flow and for his years of research and writing on the topic. He is the author of many books and over 120 articles or book chapters. He is one of the most widely cited psychologists today, in a variety of fields related to psychology and business.

Flow
In his seminal work, Flow: The Psychology of Optimal Experience, Csikszentmihalyi outlines his theory that people are most happy when they are in a state of flow--a Zen-like state of total oneness with the activity at hand and the situation (see Flow (psychology)). The idea of flow is identical to the feeling of being in the zone or in the groove. The flow state is an optimal state of intrinsic motivation, where the person is fully immersed in what he or she is doing. This is a feeling everyone has at times, characterized by a feeling of great freedom, enjoyment, fulfillment, and skill--and during which temporal concerns (time, food, ego-self, etc.) are typically ignored.

In an interview with Wired magazine, Csikszentmihalyi (pronounced CHICK-sent-me-high-ee) described flow as "being completely involved in an activity for its own sake. The ego falls away. Time flies. Every action, movement, and thought follows inevitably from the previous one, like playing jazz. Your whole being is involved, and you're using your skills to the utmost."

To achieve a flow state, a balance must be struck between the challenge of the task and the skill of the performer. If the task is too easy or too difficult, flow cannot occur.

Also, the flow state also implies a kind of focused attention, and indeed, it has been noted that mindfulness meditation, yoga, and martial arts seem to improve a person's capacity for flow. Among other benefits, all of these activities train and improve attention.

In short; flow could be described as a state where attention, motivation, and the situation meet, resulting in a kind of productive harmony or feedback.