Learning the invariants of a perceptual motor skill

The concept of invariant relative timing has typically been associated with the concept of a generalized motor programme. The present study approaches the phenomenon of invariant relative timing from the perspective of learning. The underlying question of concern for this study was, "What is learned." The specific question was whether relative timing is one of the essential properties of movement that is learned during skill acquisition. In the present experiment, subjects were given extensive practice in learning to track and reproduce a criterion waveform using a joystick control for their response. In order to test whether subjects learn the relative timing of a movement, they were transferred to tracking waveforms that were identical to the criterion in terms of relative timing, but different in terms of absolute timing. Measurements were taken on all waveforms in two conditions: (a) in a pursuit tracking condition where subjects were temporally constrained by the stimulus, and (b) in a reproduction condition where subjects' timing was not constrained. The outcome from both conditions gives support to the idea that humans learn invariant relative timing during the acquisition of a motor skill.     

Book reviews

Eclecticism comes of age John C. Norcross (ed.): Handbook of Eclectic Psychotherapy. New York: Brunner/Mazel, 1987. $65.00.

Eclecticism comes of age John C. Norcross (ed.): Casebook of Eclectic Psychotherapy. New York: Brunner/Mazel, 1987. $61.50.

Assessment in action Jennifer M. Kidd: Assessment in Action: a Manual for Those Involved in the Educational Guidance of Adults. Leicester: Unit for the Development of Adult Continuing Education, 1988. £4.50.

'A stormy adolescence' Debra Greenspoon Linesch: Adolescent Art Therapy. New York: Brunner/Mazel, 1988. $27.50.

Applying developmental theory to the practice of counselling Allen E. Ivey: Developmental Therapy; Theory into Practice. San Francisco: Jossey-Bass, 1986. £34.

Preaching to the unconverted Michael Reddy: The Manager's Guide to Counselling at Work. London: BPS and Methuen, 1987. £6.95 (£5.50 to members of the British Psychological Society).     

Book reviews

Weiskrantz, L. (1986). Blindsight: A case study and implications. Oxford University Press. Pp. 187. ISBN 0-19-852129-4. £19.50.

Humphreys, G. W. & Riddoch, M. J. (1987). to see but not to see: A case study of visual agnosia. Hove and London: Lawrence Erlbaum Associates Ltd. Pp. 124. ISBN 0-83677-064-9. £12.95.

Downing, J. A. (1988). Advances in psychology: Cognitive psychology and reading in the USSR. Amsterdam: North Holland; Elsevier Science Publishers. Pp. 471. ISBN 0-444-70374-8. $108.00.

John Beech & Ann Colley (Eds.) (1987). Cognitive approaches to reading. Chichester: John Wiley. Pp. xii + 315.

James Wertsch (Ed.) (1985). Culture, communication and cognition: Vygotskian perspectives. Cambridge: Cambridge University Press. Pp. 379. ISBN 0-521-25214-8. £27.50 (Hardback).

Fodor, J. A. (1987). Psychosemantics: The problem of meaning in the philosophy of mind. Cambridge, MA: M.I.T. Press. Pp. xiii, 1-171. ISBN 0-262-06106-6.

Richardson, K. (1988). Understanding Psychology. Milton Keynes: The Open University Press. Pp. 114. ISBN 0-335-09842-8. Paperback £7.95.

Stanovich, Keith E. (Ed.) (1988). Children's reading and the development of phonological awareness. Detroit: Wayne State University Press. Pp. 177. ISBN 0-8143-1909-2. $20.00.

Allport, A., MacKay, D.G., Prinz, W., & Scheerer, E. (Eds.), (1987). Language perception and production: Relationships between listening, speaking, reading, and writing. London: Academic Press. Pp. xiii + 497. ISBN 0-12-052750-2. £32.00

Light, L. L. & Burke, D. M. (eds.) (1988). Language, Memory and Aging. Cambridge: Cambridge University Press. Pp. 280. ISBN-0-521-32942-6. £27.50

Friedman, S.L., Scholnick, E.F., and Cocking, R. R. (1987). Bleuprints for thinking: The role of planing in cognitive development. Cambridge: Cambridge University Press. Pp. xv + 559. ISBN 0-521-25605-4. £40.00.     

Book reviews and books received

Kicking guidance into touch Ray Woolfe, Stephen Murgatroyd and Sylvia Rhys:Guidance and Counselling in Adult and Continuing EducationMilton Keynes: Open University Press, 1987, £7.95.

Pain can be catching Jeffrey A. Kottler: On Being u Therapist. San Francisco: Jossey-Bass, 1986. 12819.95

Therapy as the pursuit of cornpassion Carl Goldberg: On Being a Psychotherapist: the Journey of the Healer.New York: Gardner, 1986. f32. Reviewed by Laurence Spurling, Psychotherapist and Tutor, Department of Extra-Mural Studies, University of London

ACT now G.S. Howard, D.W. Nance and P. Myers: Adaptive Counseling andTherapy. San Francisco: Jossey-Bass, 1987. 12830.75. Reviewed by Ruth Short, WestminsterSocial Services Department, London     

A Dynamical Systems Approach to Skill Acquisition

This paper argues that the answer to the question, what has to be learned, needs to be established before the question, how is it learned, can be meaningfully addressed. Based on this conviction, some of the limitations of current and past research on skill acquisition are discussed. Motivated by the dynamical systems approach, the question of “what has to be learned” was tackled by setting up a non-linear mathematical model of the task (i.e. learning to make sideways movements on a ski apparatus). On the basis of this model, the phase lag between movements of the platform of the apparatus and the actions of the subject was isolated as an ensemble variable reflecting the timing of the subject in relation to the dynamics of the apparatus. This variable was subsequently used to study “how” the task was learned in a discovery learning experiment, in which predictions stemming from the model were tested and confirmed. Overall, these findings provided support for the hypothesis, formulated by Bernstein (1967), that one of the important effects of practice is learning to make use of reactive forces, thereby reducing the need for active muscular forces.

In addition, the data from a previous learning experiment on the ski apparatus—the results of which had been equivocal—were reconsidered. The use of phase lag as a dependent variable provided a resolution of those findings.

On the basis of the confirmatory testing of predictions stemming from the model and the clarification of findings from a previous experiment, it is argued that the dynamical systems approach put forward here provides a powerful method for pursuing issues in skill acquisition. Suggestions are made as to how this approach can be used to systematically pursue the questions that arise as a natural outcome of the experimental evidence presented here.     

Book reviews

Hearing Haggerd, M. P. & Evans, E. F. (Eds.). 1987. British Medical Bulletin, 43 (4), 775-1037. ISBN 0-443-02899-6. £22.50.

Perlmutter, M. (Ed.) (1986). Perspectives on intellectual development : The Minnesota Symposium on Child Psychology. Vol. 19. Hillsdale,NJ: Lawrence Erlbaum Associates, Inc. Pp. 261. ISBN 0-89859-784-6. £19.95.

Ellis, H. D., Jeeves, M. A., Newcombe, F., & Young, A. (Eds.) (1986). Aspects of face processing. Bordrecht : Martinus Nijhoff. Pp. 509. ISBN 90-247-3357-X. £80.25.

Gabrielsson, A. (Ed.) (1987). Action and perception in shythm and music. Stockholm: Royal Swedish Academy of Music. Pp. 237. ISBN 91-85428-51-5.

Dowling, John E. (1987). The Retina. Cambridge, MA, and London :Belknap Press. Pp. xiv + 282. ISBN 0-674-76680-6. $29.95.

Foorman, B. R. & Siegel, A. W. (1986). Acquisition of reading skills : Cultural constraints and cognitive universals. Hillsdale, NJ: Lawrence Erlbaum Associates, Inc. Pp. 168. ISBN 0-89859-642-4. £15.00.

Stillings, N., Feinstein, M., Garfield, J., Rissland, E., Rosenbaum, D., Weisler, S., & Baker-Ward, L. (1987). Cognitive science : An introduction. Cambridge, MA: MIT Press. Pp. 533. ISBN 0-262-19257-8. £22.50.

Kapur, N. (1988). Memory disorders in clinical practice. London:Butterworths. Pp. 289. ISBN 0-407-00712-1. £39.50.

Bussis, A. M., Chittenden, E. A. Amarel, M. & Klausner, E. (1985). Inquiry into meaning: An invetigation of learning to read. Hillsdale, NJ: Lawrence Erlbaum Associates, Inc. Pp. 367. ISBN 0-89859-504-5. £32.95.     

Book reviews

Lea, S. E. G., Tarpy, R. M., & Webley, P. (1987). The individual in the economy. Cambridge: Cambridge University Press. Pp. 627 + xxiv. ISBN 0-521-26872-9. £39.50 (Hardback). ISBN 0-521-317014. £13.95 (Paperback).

Davey, G. & Cullen, C. (Eds.) (1988). Human operant conditioning and behaviour modifcution. Chichester: John Wiley & Sons. Pp. x + 270. ISBN 0-471-91637-4. £29.50.

Commons, M. L., Mazur, J. E., Nevin, J. A. & Rachlin, H. (Eds.). (1987), Quantitative analyses of behavior. Vol. 5: The efect of delay and of intervening events on reinforcement value. Hillsdale, NJ: Lawrence Erlbaum Associates, Inc. Pp. 344. ISBN 0-89859-800-1. £31.00.

Pearce, J. M. (1987). An introduction to animal cognition. Hove and London: Lawrence Erlbaum Associates Ltd. Pp. 328. ISBN 0-86377-0568 (hardback) 219.95; ISBN 0-86377457-6 (paperback) £9.95.

Archer, J. (1988). The behavioural biology of aggression. Cambridge: Cambridge University Press. Pp. x + 257. ISBN 0-521-34790-4. £9.95 (paperback).

Greenberg, G. and Tobach, E. (Eds.) (1987). Cognition, language, and consciousness: Integrative tevels. The T. C. Schneirla Conference Series. Volume 2. Hillsdale, NJ: Lawrence Erlbaum Associates, Inc. Pp. ix + 301. ISBN 0-89859-7224. £27.50.

Mook, D.G. (1987). Motivation: The organisation of action. New York: Norton. Pp. xxii + 586. ISBN 0-393-95474-9. £12.95 (hardback).

Frank, H. (Ed.) (1987). Man and wolf: Advances, issues and problems in captive wow research. Dordrecht: Dr. W. Junk. Pp. xviii + 439. ISBN 90-6193-614-4. £103.25 (hardback).     

Selective noise disturbance of the information input in short-term memory

The present experiment was designed in order to investigate the effects of noise produced intermittently during the input stage of serially displayed visual materials (6-digit lists). These materials were to be memorized and subsequently reproduced on a specially designed keyboard. The four experimental conditions were the following: (1) quiet (Q);

(2) noise uninterrupted during the presentation of each list (CN);

(3) noise emitted simultaneously with each list element (500 ms) (ND);

(4) noise emitted in the interval (140 ms) between each element (NA).

Record was taken of the errors and omissions, of key response initiating times and of hand movement times. As an additional variable, subjects were required to estimate the annoyance induced by each of the four conditions. All noise conditions yielded more errors and omissions than the Q-condition, with the highest rates occurring in the two conditions where noise was superimposed on the digits. Close analysis of the errors showed that the primacy end of the lists was the most affected by noise, whereas keying speed for correct reproductions remained relatively unaffected.

On the other hand, when the speed variable was split into a decision and a motor component, it turned out that the more a condition was judged as annoying, the more the time for response decision was delayed, while the reverse occurred for keying movement times. The latter effect could possibly be ascribed to arousal induced by the three noise conditions. It is argued that noise is liable to affect differently the various components of a task performance, either directly by interference with the intake of pertinent information, or indirectly through induced annoyance or through noise modulated arousal.

They particularly would like to thank Dr M. Coltheart for his great help in the preparation of the definitive version of the paper.     

Against Relative Timing Invariance in Movement Kinematics

The kinematics of stair climbing were examined to test the assertion that relative timing is an invariant feature of human gait. Six male and four female subjects were video-recorded (at 60 Hz) while they climbed a flight of stairs 10 times at each of three speeds. Each gait cycle was divided into three segments by the maximum and minimum angular displacement of the left knee and left foot contact. Gentner's (1987) analysis methods were applied to the individual subject data to determine whether the duration of the segments remained a fixed proportion of gait cycle duration across changes in stair-climbing speed. A similar analysis was performed using knee velocity maxima to partition the gait cycle. Regardless of how the gait cycle was divided, relative timing was not found to remain strictly invariant across changes in speed. This conclusion is contrary to previous studies of relative timing that involved less conservative analysis but is consistent with the wider gait literature. Strict invariant relative timing may not be a fundamental feature of movement kinematics.     

Book reviews and books received

A passport to clients everywhere Paul Pederson (ed.):Handbook of Cross-Cultural Counseling and Therapy. Westport, Connecticut: Greenwood Press, 1986, £18.50.

Key cases in psychotherapy:their effect on therapists Windy Dryden (ed.): Key Cases in Psychotherapy. London: Croom Helm, 1987. 12822.50. Reviewed by P. Paul Heppner and Mary J. Heppner, University of Missouri-Columbia, USA

An integrative approach to identity, threat and coping Glynis Breakwell:Coping with Threatened Identities. London: Methuen, 1986. f7.95. Reviewed by Dr Petriaka Clarkson, metanoia Psychotherapy Training Institute, London.

An open look at Open University workshops The Coping With Crisis Research Group:Running Workshops: London: Croom Helm, 1987. f12.95. Reviewed by Maria Gilbert, metanoia Psychotherapy Training Institute, London.     

Book reviews

Smith, L. D. (1986). Behaviorism and logical positivism: A reassessment of the alliance. Stanford, CA: Stanford University Press. Pp. ix + 398. ISBN 0-8047-13014. $42.50.

Schusterman, R. J., Thomas, J. A., & Wood, F. G. (Eds.). (1986). Dolphin cognition and behavior: A comparative approach. Hillsdale, NJ: Lawrence Erlbaum Associates, Inc. Pp. xv + 393. ISBN 0-89859-5940. Paperback, £17.00.

Rauschecker, J. P. & Marler, P. (Eds.). (1987). Zmprinting and cortical plasticity: Comparative aspects of sensitive periods. New York: John Wiley & Sons. Pp. 377. ISBN 0-471-84368-7. £57.50.

Walker, S. (1987). Animal learning: An introduction. London: Routledge & Kegan Paul. Pp. 426. ISBN 0-7102-0482-5; hardback, £20.00. ISBN 0-7102-1152-X; paperback, £10.95.

Gray, J. A. (1987). The psychology of fear and stress (second edition). Cambridge: Cambridge University Press. Pp. X+422. ISBN 0521-24958-9 (hardback). £42.50. ISBN 0521-27098-7 (paperback). £1 5.00.     

Book reviews

Richards, G. (1987). Human evolution: An introduction for the behavioural sciences. London: Routledge & Kegan Paul. Pp. 374. ISBN 0-7102-0326-8. £40.

Roitblat, H. L. (1987). Introduction to comparative cognition. New York: Freeman. Pp. xiv+377. ISBN 0-7167-17784. Hardback £29.95; paperback £17.95.

Pauly, P. J. (1987). Controlling life: Jacques Loeb and the engineering ideal in biology. New York: Oxford University Press. Pp. 252. ISBN 0-19-50424-1. £22.50.     

Book reviews

Jacknedoff, R. (1985). Semantics and cognition. Cambridge, MA: The MIT Press, Pp. 283. ISBN 0-262-60013-7. £ 9.95.

Lakoff, g. (1987). Women, fire and dangerous things : What categories reveal about the mind. Chicago, IL.: Chicago University Press. Pp. 624. ISBN 0-266-46803-8. £19.95.

Longuet-Higgins, H. C. (1987). Mental processes : Studies in cognitive science. Cambridge, MA: The MIT Press. Pp. 424. ISBN 0-262-12119-0. £22.50.

Nowakowska, M. (1986). Cognitive sciences: Basic problems, new perspectives, and implications for artificial intelligence. Orlando, FL: Academic Press. Pp. 379. ISBN 0-12-522620-9. £44.50.

Winograd, T. & Flores, F. (1986). Understanding computers and cognition: A new foundation for design. Norwood, NJ: Ablex. Pp. 207. ISBN 0-89391-050-3. £23.

Weisberg, R. W. (1986). Creativity: Genius and other myths. New York:W. H.Freeman and company. Pp. 169. ISBN 0-1767-1769-7. £9.95.

Bosshardt, H. R. S. G (1986). Perspektiven auf Sprache. Berlin : Walter de Gruyter. Pp. 326. ISBN 3-11-010068-1. DM134.00.     

Phenomenal causation at a distance

The aim of this research was to study the finding by Michotte, that a moving object A can apparently produce movement in a projectile B without making contact with it.

The experiments confirm the existence of a causal impression of “pushing at a distance,” but they demonstrate that the greater the distance the smaller the chance that this impression will occur.

When it does, in fact, occur, it has the same characteristics, and is associated with the same experimental conditions, as the impression of “pushing with contact.”

Temporal continuity must obtain between the stopping of the moving object and the starting of the projectile; this refutes any theory positing that there is a “passage” of movement from one object to the other. The effects of differences in speed of movement, whether absolute or relative, are similar in both instances.

In general, however, it appears that distance slightly accentuates the segregation of the movements and that the temporal and kinematic conditions of integration require to be more favourable in the case of distance, if an impression of pushing is to be given which is as satisfying as that found in the case of direct contact.

The size of the Radius of Action, that is, the extent of the passive phase of the projectile, is of the same order in the two cases.

The results bring out the fundamentally temporal-kinematic nature of the perceptual pattern of pushing. They appear difficult to reconcile with an interpretation based on past experience, but tally with the theory of “Ampliation of Movement” put forward by Michotte. According to this theory the essential point lies in the phenomenal transitory belonging to A (the moving object) of the movement performed by B (the projectile).     

Book reviews

Blanchard, R. J. & Blanchard, D. C. (Eds.). (1986). Advances in the study of aggression, Volume 2. Orlando, Florida: Academic Press. Pp. 228. ISBN 0-12-037702-5. $60.00 (hardback).

Dobbing, J. (Ed.). (1987). Sweetness. Berlin: Springer-Verlag. Pp. 282. ISBN 3-540-17045-6. £42.

Ellen, P. & Thinus-Blanc, C. (Eds.). (1987). Cognitive processes and spatial orientation in animal and man. Dordrecht: Martinus Nijhoff. Vol. 1. Experimental animal psychology and erhology. Pp. 331. ISBN 90-247-3447-9. £60.95. Vol. 2. Neurophysiology and developmental aspects. Pp. 321. ISBN 90-247-3448-7. £60.95     

Book reviews

Premack, D. Gavagai! or the future history of the animal language controversy. Cambridge, Mass.: The MIT Press. 1986. Pp. 164. ISBN 0-262-16099-4. £12.50.

Gandelman, R. (Ed.). Autobiographies in experimental psychology. Hills dale, N. J.: Lawrence Erlbaum Associates, Inc. 1985. Pp. 179. ISBN 0-89859-544-4. £14.00.

Modgil, S. and Modgil, C. (Eds.). B.F. Skinner: Consensus and controversy Lewes, East Sussex: The Falmer Press. 1987. Pp. xii+383. ISBN 1-85000-026-3. Hardback, £35.00.

Boakes, R. A, Popplewell, D. A. and Burton, M.J. (Eds.) Eating habits: Food, physiology and learned behaviour. Chichester: Wiley. 1987. Pp. xii+ 225. IBSN 0-471-90744-8. £20.00.     

Training of fast tapping with reduction of kinaesthetic, tactile, visual and auditory sensations

Five subjects were trained to tap on a light Morse-key during nerve compression block. The training sessions lasted for 40 sec., with a 5 sec. rest after the first 20 sec. work period. The group learning curve reached 89.5 per cent. level of normal performance by the eighth training session. In the ninth, the testing session, subjects tapped with visual and auditory sense reduction superimposed on the kinaesthetic and tactile impariment of the training condition. Performance in the testing session reached 40.9 per cent. of normal.

The sixth subject was trained in the same task as the other five subjects, but the training condition included elimination of cues from all four sensory channels. He reached 79.09 per cent. of his normal tapping performance in the seventh session.

These results show that the motor skill of tapping can be relearned in the absence of kinaesthetic cues. Furthermore when the subject has no conscious knowledge of any peripheral sensory cues connected with the ongoing motor activity, learning can nevertheless take place. These findings lead to the hypothesis, that skilled motor activity can be monitored by central processes alone.

During the training sessions subjects showed a tendency of tapping in groups of gradually increasing length. It is hypothesized that increased number of taps forming a group gives an indication to the possible mode of action of these central processes.     

Timing and co-ordination of repetitive bimanual movements

Similar timing of movements of the two hands has been observed when they are moved to separate targets (Kelso et al., 1979). This was taken as evidence for a low-level, co-ordinative structure that constrains the muscles of the arms to function as a single unit.

An experiment to investigate the relation between voluntary timing control and timing in bimanual movement is described. The task required subjects to make repetitive movements of unequal difficulty for the two hands with the hands arriving synchronously at their respective targets. Estimates of the covariance of successive intervals defined by pairs of left-right responses (arrivals at the targets) were not negative. It is shown that this indicates that the motor delay between the timer regulating repetition rate and the overt responses has no component common to left- and right-responses. Although the co-ordinative structure is described as low-level, in terms of the time sequence of operations associated with each response pair, the data indicate its place is before, not after, the timer.