Segmentation and coupling in complex movements.

In two experiments we explore the structure of complex sequences of drawing movements. We find that in these movements a single parameter--the velocity gain factor--relates the geometrical and kinematic aspects of the movement trajectory via a two-thirds power law. In Experiment 1 we investigate the relation between the velocity gain factor and the linear extent of the trajectory. In Experiment 2 we demonstrate that the gain factor provides a criterion for segmenting the movement into distinct units of motor action, and we investigate the effects of the speed of execution on this segmentation. A theoretical analysis shows that the results of both Experiments 1 and 2 can be given a unitary interpretation by assuming a coupling function of variable strength between segments. The general problem of representing motor programs is discussed within this theoretical framework.

[1]  Alfred Binet,et al.  Sur la vitesse Des mouvements graphiques , 1893 .

[2]  Noble Harter,et al.  Studies in the physiology and psychology of the telegraphic language , 1897 .

[3]  Lowe Bryan William,et al.  Studies on the telegraphic language: The acquisition of a hierarchy of habits. , 1899 .

[4]  F. Freeman.  Experimental analysis of the writing movement. , 1914 .

[5]  P. Fitts.  The information capacity of the human motor system in controlling the amplitude of movement. , 1954, Journal of experimental psychology.

[6]  F. Plum.  Handbook of Physiology. , 1960 .

[7]  John A. Nelder,et al.  A Simplex Method for Function Minimization , 1965, Comput. J..

[8]  W. G. Koster,et al.  Analysis and Synthesis of Handwriting , 1967 .

[9]  Saul Sternberg,et al.  The discovery of processing stages: Extensions of Donders' method , 1969 .

[10]  J. Vredenbregt,et al.  Coordination in muscle activity during simple movements , 1971 .

[11]  J. Brožek.  Attention and Performance II. , 1971 .

[12]  S. T. Klapp,et al.  Implicit speech in reading: Reconsidered , 1973 .

[13]  D. Chaffin,et al.  An investigation of fitts' law using a wide range of movement amplitudes. , 1976, Journal of motor behavior.

[14]  S. T. Klapp,et al.  Motor programming within a sequence of responses. , 1976, Journal of motor behavior.

[15]  J. Kelso.  Motor control mechanisms underlying human movement reproduction. , 1977, Journal of experimental psychology. Human perception and performance.

[16]  S. T. Klapp,et al.  REACTION TIME ANALYSIS Of PROGRAMMED CONTROL , 1977, Exercise and sport sciences reviews.

[17]  J. Kelso.  Motor control mechanisms underlying human movement reproduction. , 1977, Journal of experimental psychology. Human perception and performance.

[18]  C. N. Liu,et al.  Automatic signature verification based on accelerometry , 1977 .

[19]  A. Wing.  Response Timing in Handwriting , 1978 .

[20]  E. Bizzi,et al.  Processes controlling arm movements in monkeys. , 1978, Science.

[21]  G. Stelmach.  Information processing in motor control and learning , 1978 .

[22]  Stephen Monsell,et al.  The Latency and Duration of Rapid Movement Sequences: Comparisons of Speech and Typewriting , 1978 .

[23]  James L. McClelland.  On the time relations of mental processes: An examination of systems of processes in cascade. , 1979 .

[24]  P. N. Kugler,et al.  1 On the Concept of Coordinative Structures as Dissipative Structures: I. Theoretical Lines of Convergence* , 1980 .

[25]  P. Viviani,et al.  32 Space-Time Invariance in Learned Motor Skills , 1980 .

[26]  G. Stelmach,et al.  Tutorials in Motor Behavior , 1980 .

[27]  A. Sanders.  20 Stage Analysis of Reaction Processes , 1980 .

[28]  P. N. Kugler,et al.  Patterns of human interlimb coordination emerge from the properties of non-linear, limit cycle oscillatory processes: theory and data. , 1981, Journal of motor behavior.

[29]  L. H. Shaffer,et al.  Performances of Chopin, Bach, and Bartok: Studies in motor programming , 1981, Cognitive Psychology.

[30]  P. Viviani,et al.  Trajectory determines movement dynamics , 1982, Neuroscience.

[31]  P. H. Greene,et al.  Why is it easy to control your arms ? , 1982, Journal of motor behavior.

[32]  B. Bergum,et al.  Attention and performance IX , 1982 .

[33]  Timothy D. Lee,et al.  Motor Control and Learning: A Behavioral Emphasis , 1982 .

[34]  A. Thomassen,et al.  Preparation of partly precued handwriting movements: The size of movement units in handwriting , 1983 .

[35]  P. Viviani,et al.  The relation between linear extent and velocity in drawing movements , 1983, Neuroscience.

[36]  E. R. Crossman,et al.  Feedback Control of Hand-Movement and Fitts' Law , 1983, The Quarterly journal of experimental psychology. A, Human experimental psychology.

[37]  E. Bizzi,et al.  Posture control and trajectory formation in single- and multi-joint arm movements. , 1983, Advances in neurology.

[38]  Pietro Morasso,et al.  How a discontinuous mechanism can produce continuous patterns in trajectory formation and handwriting , 1983 .

[39]  Gerard P. van Galen,et al.  The independent monitoring of form and scale factors in handwriting , 1983 .

[40]  P. Viviani,et al.  The law relating the kinematic and figural aspects of drawing movements. , 1983, Acta psychologica.

[41]  J. Desmedt.  Motor control mechanisms in health and disease , 1983 .

[42]  Gerard P. van Galen,et al.  Programming in handwriting: Reaction time and movement time as a function of sequence length , 1983 .

[43]  Geoffrey E. Hinton,et al.  Parallel computations for controlling an arm. , 1984, Journal of motor behavior.

[44]  A. Gordon,et al.  Choosing between movement sequences: A hierarchical editor model. , 1984 .

[45]  B. Butterworth,et al.  Language Production II: Development, Writing, and Other Language Processes , 1985 .

[46]  Paolo Viviani,et al.  Do Units of Motor Action Really Exist , 1986 .

[47]  Kenneth J. Kokjer,et al.  The Information Capacity of the Human Fingertip , 1987, IEEE Transactions on Systems, Man, and Cybernetics.