Various Kinds of Sensory-Motor Performances in the Schmidt's Scheme
Journal Title: Antropomotoryka. Journal of Kinesiology and Exercise Sciences - Year 2003, Vol 13, Issue 26
Abstract
Presented paper unveils some characteristic trait of the SCHMIDT'S scheme. To analyze reflex it is enough to follow only one loop in the scheme. However, as far as triggered response is concerned, it is necessary to track at least two consecutive loops in the scheme: first, causing preliminary stimulation and other, causing execution of a response. They follow different paths: former loop follows feedforward path, and the latter - feedback one. Shortening of latency in a triggered response (as compared to choice response) testifies to parallel data processing in human central nervous system, because preliminary stimulation has to come ahead of signal starting response - during execution of former responses constituting given motor performance. Surprise is shown in the modified scheme as a conflict between two consecutive stimuli: both feedback ones in the case of side stimulus, and feedforward with feedback ones in the case of back stimulus. However, to present all these processes, the scheme has to gain third dimension, i.e. it becomes necessary to analyze at least two consecutive layers of the scheme.Trying to compare the role of the Schmidt's scheme in the development of motor control science with any physical pattern, one could note that it resembles to some extent the Bohr model of atom. At some stage of development of physics it was a great progress: thanks to some revolutionary premises it well explained properties of the atom of hydrogen. Unfortunately - only hydrogen. Hence, it was later modified, and when its capabilities became exhausted, it landed at prominent place in the museum of physics. I think, the SCHMIDT'S scheme - the key element of which seems to be generalized motor program - includes yet some unexploited capabilities, hence discarding it would be undoubtedly premature.Proposed in this paper modifications enable to look at the anatomy of a sensory-motor response to single stimulus from new point of view, but - unfortunately - do not make it a complete and universal pattern because of some kind of original sin. SCHMIDT'S scheme can be termed engineer model, constructed on the basis of logic. Therefore, it not suitable for explaining a behaviour called in daily life intuitive, being proper response in new situation or previously not known circumstances. Such a behaviour cannot be analyzed on the basis of logic, because is independent of any reasoning process [WEBSTER'S, 1989].
Authors and Affiliations
Wacław Petryński
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