Catching balls: How to get the hand to the right place at the right time.

Information specifying the future passing distance of an approaching object is available (in units of object size) in the ratio of optical displacement velocity and optical expansion velocity. Despite empirical support for the assumption that object size can serve as a metric in the perception of passing distance, the present series of experiments reveals that in catching a ball subjects do not rely on such "point-predictive" information. The angle at which (real and simulated) balls approached the subject systematically affected verbal and manual estimates of future passing distance, as well as the kinematic characteristics of catching movements. To catch a ball, the actor uses momentary action-related information instead of spatiotemporal estimates. The hand velocity is geared to information specifying the currently required velocity. This secures ending up at the right place in the right time, regardless of where this may be.

[1]  R. Bootsma,et al.  Timing an attacking forehand drive in table tennis. , 1990 .

[2]  W Schiff,et al.  Information Used in Judging Impending Collision , 1979, Perception.

[3]  V Cavallo,et al.  Visual Information and Skill Level in Time-To-Collision Estimation , 1988, Perception.

[4]  Bruce Bridgeman,et al.  Perception & control of self-motion , 1991 .

[5]  James R. Tresilian,et al.  Approximate information sources and perceptual variables in interceptive timing. , 1994 .

[6]  H. Wagner.  Flow-field variables trigger landing in flies , 1982, Nature.

[7]  W H Warren,et al.  Perceiving affordances: visual guidance of stair climbing. , 1984, Journal of experimental psychology. Human perception and performance.

[8]  Martin S Banks,et al.  Gravity as a Monocular Cue for Perception of Absolute Distance and/or Absolute Size , 1992 .

[9]  W. Schiff.  PERCEPTION OF IMPENDING COLLISION: A STUDY OF VISUALLY DIRECTED AVOIDANT BEHAVIOR. , 1965, Psychological monographs.

[10]  B. Hills.  Vision, Visibility, and Perception in Driving , 1980, Perception.

[11]  M. Cynader,et al.  The visual perception of motion in depth. , 1979, Scientific American.

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

[13]  Claire F. Michaels,et al.  The optics and actions of catching fly balls , 1992 .

[14]  Seville Chapman.  Catching a Baseball , 1968 .

[15]  Stephen Grossberg,et al.  Adaptive neural networks for control of movement trajectories invariant under speed and force rescaling , 1991 .

[16]  J T Todd,et al.  Visual information about moving objects. , 1981, Journal of experimental psychology. Human perception and performance.

[17]  David N. Lee,et al.  Visual Timing in Hitting An Accelerating Ball , 1983, The Quarterly journal of experimental psychology. A, Human experimental psychology.

[18]  R J Bootsma,et al.  Visual information about time-to-collision between two objects. , 1993, Journal of experimental psychology. Human perception and performance.

[19]  J. O'Regan,et al.  Estimating psychometric functions in forced-choice situations: Significant biases found in threshold and slope estimations when small samples are used , 1989, Perception & psychophysics.

[20]  D. Regan,et al.  Binocular and monocular stimuli for motion in depth: Changing-disparity and changing-size feed the same motion-in-depth stage , 1979, Vision Research.

[21]  Gary E. Riccio,et al.  Responses to Optical Looming in the Retinal Center and Periphery , 1990 .

[22]  Reinoud J. Bootsma,et al.  Predictive information and the control of action: What you see is what you get. , 1991 .

[23]  Digby Elliott,et al.  Vision and motor control , 1992 .

[24]  F. Massey,et al.  Introduction to Statistical Analysis , 1970 .

[25]  H. Ross,et al.  Optic-Flow and Cognitive Factors in Time-to-Collision Estimates , 1983, Perception.

[26]  David N. Lee,et al.  A Theory of Visual Control of Braking Based on Information about Time-to-Collision , 1976, Perception.

[27]  W. H. Warren,et al.  Visual control of step length during running over irregular terrain. , 1986, Journal of experimental psychology. Human perception and performance.

[28]  D. Regan,et al.  Visual processing of four kinds of relative motion , 1986, Vision Research.

[29]  C. E. Peper,et al.  Chapter 12 Predictive Visual Information Sources for the Regulation of Action with Special Emphasis on Catching and Hitting , 1992 .

[30]  R. Christina,et al.  Psychology of motor behavior and sport , 1978 .

[31]  Reinoud J. Bootsma,et al.  Chapter 6 Visual Control of an Attacking Forehand Drive in Table Tennis , 1988 .

[32]  W. Warren,et al.  Visual guidance of walking through apertures: body-scaled information for affordances. , 1987, Journal of experimental psychology. Human perception and performance.

[33]  David N. Lee,et al.  Regulation of gait in long jumping. , 1982 .

[34]  D. Ingle,et al.  Brain mechanisms and spatial vision , 1985 .

[35]  W Schiff,et al.  Accuracy of judging time to arrival: effects of modality, trajectory, and gender. , 1990, Journal of experimental psychology. Human perception and performance.

[36]  Peter J. Beek,et al.  Physical and informational principles in modelling coordinated movements , 1991 .

[37]  O. Meijer,et al.  Complex movement behaviour : 'the' motor-action controversy , 1988 .

[38]  J. Gibson.  The Senses Considered As Perceptual Systems , 1967 .

[39]  J. Gibson.  The Ecological Approach to Visual Perception , 1979 .

[40]  J. Tresilian,et al.  Empirical and theoretical issues in the perception of time to contact. , 1991, Journal of experimental psychology. Human perception and performance.

[41]  David N. Lee,et al.  Plummeting gannets: a paradigm of ecological optics , 1981, Nature.

[42]  Reinoud J. Bootsma,et al.  The Effects of Anxiety on Perceiving the Reachability of Passing Objects , 1992 .

[43]  L. S. Mark,et al.  Eyeheight-scaled information about affordances: a study of sitting and stair climbing. , 1987, Journal of experimental psychology. Human perception and performance.

[44]  J. Tresilian.  Perceptual Information for the Timing of Interceptive Action , 1990, Perception.

[45]  M. Kaiser,et al.  Optical specification of time-to-passage: Observers' sensitivity to global tau. , 1993 .

[46]  J. Dannemiller,et al.  Role of image acceleration in judging landing location of free-falling projectiles. , 1993 .