The spatio-temporal organization of human movement always takes place within a specific psychological context. Actors may be in various mental states, and these states will likely affect the way basic movements are organized and controlled.
Our ability to adopt or maintain balance and locomotion is an essential aspect of human movement behavior. This is in as much true for the posture of a small finger joint, as it is for whole-body balance and walking. An inability to maintain balance and locomotion, in turn, can have significant bearing on motor performance, mobility and thus on quality of life.
Human actors are always, by definition, in some psychological state. For example, we can experience an emotion; we can perform mental activity; we can try to divide our attention between two tasks; we are in a certain state of consciousness, etc. Coordinated movements are deeply interlinked with such ever-changing psychological states. A complete understanding of coordination must involve understanding of how it is embedded in the human mind.