Adaptive coordination and alignment of eye and hand.

Under spatial misalignment of eye and hand induced by laterally displacing prisms (11.4 degrees in the rightward direction), subjects pointed 60 times (once every 3 s) at a visually implicit target (straight ahead of nose, Experiment 1) or a visually explicit target (an objectively straight-ahead target, Experiment 2). For different groups in each experiment, the hand became visible early in the sagittal pointing movement (early visual feedback). Adaptation to the optical misalignment during exposure (direct effects) was rapid, especially with early feedback; complete compensation for the misalignment was achieved within about 30 trials, and overcompensation occurred in later trials, especially with an explicit target. In contrast, adaptation measured with the misalignment removed and without visual feedback after blocks of 10 pointing trials (aftereffects) was slow to develop, especially with delayed feedback and an implicit target; at most, about 40% compensation for the misalignment occurred after 60 trials. This difference between direct effects and aftereffects is discussed in terms of separable adaptive mechanisms that are activated by different error signals. Adaptive coordination is activated by error feedback and involves centrally located, strategically flexible, short-latency processes to correct for sudden changes in operational precision that normally occur with short-term changes in coordination tasks. Adaptive alignment is activated automatically by spatial discordance between misaligned systems and involves distributed, long-latency processes to correct for slowly developing shifts in alignment among perceptual-motor components that normally occur with long-term drift. The sudden onset of misalignment in experimental situations activates both mechanisms in a complex and not always cooperative manner, which may produce overcompensatory behavior during exposure (i.e., direct effects) and which may limit long-term alignment (i.e., aftereffects).

[1]  J. Uhlarik,et al.  Role of cognitive factors on adaptation to prismatic displacement. , 1973, Journal of experimental psychology.

[2]  C. S. Harris,et al.  Beware of the Straight-Ahead Shift—A Nonperceptual Change in Experiments on Adaptation to Displaced Vision , 1974, Perception.

[3]  Les G. Carlton,et al.  Chapter 1 Visual Processing Time and the Control of Movement , 1992 .

[4]  G M Redding,et al.  Additivity in adaptation to optical tilt. , 1978, Journal of experimental psychology. Human perception and performance.

[5]  P. Churchland.  Neurophilosophy: Toward a unified science of the mind , 1989 .

[6]  R. Welch.  Perceptual modification : adapting to altered sensory environments / Robert B. Welch , 1978 .

[7]  G. M. Redding,et al.  Sources of “overadditivity” in prism adaptation , 1978, Perception & psychophysics.

[8]  D. Robinson.  Adaptive gain control of vestibuloocular reflex by the cerebellum. , 1976, Journal of neurophysiology.

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

[10]  Gordon M. Redding,et al.  Chapter 5 Adaptive Eye-Hand Coordination: Implications of Prism Adaptation for Perceptual-Motor Organization , 1992 .

[11]  I P Howard,et al.  The Relative Lability of Mobile and Stationary Components in a Visual-Motor Adaptation Task , 1974, The Quarterly journal of experimental psychology.

[12]  B Wallace,et al.  Adaptive mechanisms in perceptual-motor coordination: components of prism adaptation. , 1988, Journal of motor behavior.

[13]  P. Schilder.  The Image and Appearance of the Human Body: Studies in the Constructive Energies of the Psyche , 1936 .

[14]  G. Fullerton.  Psychology and physiology. , 1896 .

[15]  J. Baily,et al.  Adaptation to Prisms: Do Proprioceptive Changes Mediate Adapted Behaviour with Ballistic Arm Movements? , 1972, The Quarterly journal of experimental psychology.

[16]  M. Jeannerod.  The neural and behavioural organization of goal-directed movements , 1990, Psychological Medicine.

[17]  G M Redding,et al.  Effects of homogeneous and variable exposure on magnitude of adaptation to optical tilt. , 1981, Journal of experimental psychology. Human perception and performance.

[18]  Felice L. Bedford,et al.  Constraints on learning new mappings between perceptual dimensions , 1989 .

[19]  D. Elliott,et al.  The Utilization of Visual Feedback Information during Rapid Pointing Movements , 1985, The Quarterly journal of experimental psychology. A, Human experimental psychology.

[20]  R B Welch,et al.  The manipulation of informational feedback and its effects upon prism adaptation. , 1969, Canadian journal of psychology.

[21]  L. K. Canon,et al.  Influence of concurrent and terminal exposure conditions on the nature of perceptual adaptation. , 1971, Journal of experimental psychology.

[22]  Wilkinson Da,et al.  Visual-motor control loop: a linear system? , 1971 .

[23]  G. M. Redding,et al.  Effects of Pointing Rate and Availability of Visual Feedback on Visual and Proprioceptive Components of Prism Adaptation. , 1992, Journal of motor behavior.

[24]  Ian P. Howard,et al.  Additivity of components of prismatic adaptation , 1974 .

[25]  L. Proteau.  Chapter 4 On The Specificity of Learning and the Role of Visual Information for Movement Control , 1992 .

[26]  Ian P. Howard,et al.  Human visual orientation , 1982 .

[27]  H. Cunningham.  Aiming error under transformed spatial mappings suggests a structure for visual-motor maps. , 1989, Journal of experimental psychology. Human perception and performance.

[28]  R. Held,et al.  Neonatal deprivation and adult rearrangement: complementary techniques for analyzing plastic sensory-motor coordinations. , 1961, Journal of comparative and physiological psychology.

[29]  H. Pick,et al.  Visual and proprioceptive adaptation to optical displacement of the visual stimulus. , 1966, Journal of experimental psychology.

[30]  B Wallace,et al.  Effects on prism adaptation of duration and timing of visual feedback during pointing. , 1990, Journal of motor behavior.

[31]  D. Meyer,et al.  Function learning: induction of continuous stimulus-response relations. , 1991, Journal of experimental psychology. Learning, memory, and cognition.

[32]  Richard A. Schmidt,et al.  Terminal Accuracy of Unexpectedly Loaded Rapid Movements , 1980 .

[33]  B Craske,et al.  No retinal component in prism adaptation. , 1974, Acta psychologica.

[34]  George E. Stelmach,et al.  Central and Peripheral Mechanisms in Motor Control , 1976 .

[35]  H. Werner,et al.  Toward a general theory of perception. , 1952, Psychological review.

[36]  Stanley Coren.  Adaptation to prismatic displacement as a function of the amount of available information , 1966 .

[37]  G. M. Redding,et al.  Cognitive Load and Prism Adaptation. , 1992, Journal of motor behavior.

[38]  Robert Sessions Woodworth,et al.  THE ACCURACY OF VOLUNTARY MOVEMENT , 1899 .

[39]  R B Welch,et al.  Evidence for a three-component model of prism adaptation. , 1974, Journal of experimental psychology.

[40]  B Wallace,et al.  Components of prism adaptation in terminal and concurrent exposure: Organization of the eye-hand coordination loop , 1988, Perception & psychophysics.

[41]  Robert B. Welch,et al.  The generality of the “target-pointing effect” in prism adaptation , 1970 .

[42]  E. Bizzi.  7 Central and Peripheral Mechanisms in Motor Control , 1980 .

[43]  M A Goodale,et al.  Kinematic analysis of limb movements in neuropsychological research: subtle deficits and recovery of function. , 1990, Canadian journal of psychology.