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Is the thumb a fifth finger? A study of digit interaction during force production tasks

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Abstract

We studied indices of digit interaction in single- and multi-digit maximal voluntary contraction (MVC) tests when the thumb acted either in parallel or in opposition to the fingers. The peak force produced by the thumb was much higher when the thumb acted in opposition to the fingers and its share of the total force in the five-digit MVC test increased dramatically. The fingers showed relatively similar peak forces and unchanged sharing patterns in the four-finger MVC task when the thumb acted in parallel and in opposition to the fingers. Enslaving during one-digit tasks showed relatively mild differences between the two conditions, while the differences became large when enslaving was quantified for multi-digit tasks. Force deficit was pronounced when the thumb acted in parallel to the fingers; it showed a monotonic increase with the number of explicitly involved digits up to four digits and then a drop when all five digits were involved. Force deficit all but disappeared when the thumb acted in opposition to the fingers. However, for both thumb positions, indices of digit interaction were similar for groups of digits that did or did not include the thumb. These results suggest that, given a certain hand configuration, the central nervous system treats the thumb as a fifth finger. They provide strong support for the hypothesis that indices of digit interaction reflect neural factors, not the peripheral design of the hand. An earlier formal model was able to account for the data when the thumb acted in parallel to the fingers. However, it failed for the data with the thumb acting in opposition to the fingers.

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References

  • Baud-Bovy G, Soechting JF (2001) Two virtual fingers in the control of the tripod grasp. J Neurophysiol 86:604–615

    CAS  PubMed  Google Scholar 

  • Biermann K, Schmitz F, Witte OW, Konczak J, Freund HJ, Schnitzler A (1998) Interaction of finger representation in the human first somatosensory cortex: a neuromagnetic study. Neurosci Lett 251:13–16

    Article  CAS  PubMed  Google Scholar 

  • Carson RG, Kelso JA (2004) Governing coordination: behavioural principles and neural correlates. Exp Brain Res 154:267–274

    Article  CAS  PubMed  Google Scholar 

  • Danion F, Latash ML, Li Z-M, Zatsiorsky VM (2000) The effects of fatigue on multi-finger coordination in force production tasks. J Physiol 523:523–532

    CAS  PubMed  Google Scholar 

  • Danion F, Latash ML, Li Z-M, Zatsiorsky VM (2001) The effect of a fatiguing exercise by the index finger on single- and multi-finger force production tasks. Exp Brain Res 138:322–329

    Article  CAS  PubMed  Google Scholar 

  • Danion F, Schöner G, Latash ML, Li S, Scholz JP, Zatsiorsky VM (2003) A force mode hypothesis for finger interaction during multi-finger force production tasks. Biol Cybern 88:91–98

    Article  PubMed  Google Scholar 

  • Duque J, Thonnard JL, Vandermeeren Y, Sebire G, Cosnard G, Olivier E (2003) Correlation between impaired dexterity and corticospinal tract dysgenesis in congenital hemiplegia. Brain 126:732–747

    Article  PubMed  Google Scholar 

  • Ehrsson HH, Fagergren E, Forssberg H (2001) Differential fronto-parietal activation depending on force used in a precision grip task: an fMRI study. J Neurophysiol 85:2613–2623

    CAS  PubMed  Google Scholar 

  • Gentilucci M, Caselli L, Secchi C (2003) Finger control in the tripod grasp. Exp Brain Res 149:351–360

    PubMed  Google Scholar 

  • Goodkin HP, Thach WT (2003) Cerebellar control of constrained and unconstrained movements. II. EMG and nuclear activity. J Neurophysiol 89:896–908

    CAS  PubMed  Google Scholar 

  • Goodman SR, Latash ML, Li S, Zatsiorsky VM (2003) Analysis of a network for finger interaction during two-hand multi-finger force production tasks. J Appl Biomech 19:295–309

    Google Scholar 

  • Hamada Y, Nozawa T, Kado H, Suzuki R (2000) Different laterality between the thumb and index finger in human SII activities. Neuroreport 11:3603–3606

    CAS  PubMed  Google Scholar 

  • Houk JC, Buckingham JT, Barto AG (1996) Models of the cerebellum and motor learning. Behav Brain Sci 19:368–383

    Google Scholar 

  • Jarvelainen J, Schurmann M (2002) The motor cortex approximately 20 Hz rhythm reacts differently to thumb and middle finger stimulation: an MEG study. Neuroreport 13:1243–1246

    Article  PubMed  Google Scholar 

  • Johanson ME, Valero-Cuevas FJ, Hentz VR (2001) Activation patterns of the thumb muscles during stable and unstable pinch tasks. J Hand Surg 26:698–705

    CAS  Google Scholar 

  • Kilbreath SL, Gandevia SC (1994) Limited independent flexion of the thumb and fingers in human subjects. J Physiol 479:487–497

    PubMed  Google Scholar 

  • Kinoshita H, Murase T, Bandou T (1996) Grip posture and forces during holding cylindrical objects with circular grips. Ergonomics 39:1163–1176

    CAS  PubMed  Google Scholar 

  • Lang CE, Schieber MH (2003) Differential impairment of individuated finger movements in humans after damage to the motor cortex or the corticospinal tract. J Neurophysiol 90:1160–1170

    PubMed  Google Scholar 

  • Latash ML, Li Z-M, Zatsiorsky VM (1998) A principle of error compensation studied within a task of force production by a redundant set of fingers. Exp Brain Res 122:131–138

    Article  CAS  PubMed  Google Scholar 

  • Latash ML, Li S, Danion F, Zatsiorsky VM (2002) Central mechanisms of finger interaction during one- and two-hand force production at distal and proximal phalanges. Brain Res 924:198–208

    Article  CAS  PubMed  Google Scholar 

  • Leijnse JNAL, Snijders CJ, Bonte JE, Landsmeer JMF, Kalker JJ, Van Der Meulen JC, Sonneveld GJ, Hovius SER (1993) The hand of the musician: the kinematics of the bidigital finger system with anatomical restrictions. J Biomech 26:1169–1179

    Article  CAS  PubMed  Google Scholar 

  • Leijnse JN, Walbeehm ET, Sonneveld GJ, Hovius SE, Kauer JM (1997) Connections between the tendons of the musculus flexor digitorum profundus involving the synovial sheaths in the carpal tunnel. Acta Anat 160:112–122

    CAS  Google Scholar 

  • Li S, Danion F, Latash ML, Li Z-M, Zatsiorsky VM (2000) Characteristics of finger force production during one- and two-hand tasks. Hum Move Sci 19:897–924

    Article  Google Scholar 

  • Li S, Danion F, Latash ML, LiZ-M, Zatsiorsky VM (2001) Bilateral deficit and symmetry in finger force production during two-hand multi-finger tasks. Exp Brain Res 141:530–540

    Article  CAS  PubMed  Google Scholar 

  • Li Z-M, Latash ML, Newell KM, Zatsiorsky VM (1998a) Motor redundancy during maximal voluntary contraction in four-finger tasks. Exp Brain Res 122:71–78

    Article  CAS  PubMed  Google Scholar 

  • Li Z-M, Latash ML, Zatsiorsky VM (1998b) Force sharing among fingers as a model of the redundancy problem. Exp Brain Res 119:276–286

    Article  CAS  PubMed  Google Scholar 

  • MacKenzie CL, Iberall T (1994) The grasping hand. North Holland, Amsterdam

  • Marzke MW (1992) Evolutionary development of the human thumb. Hand Clinics 8:1–8

    CAS  Google Scholar 

  • Miall RC, Weir DJ, Wolpert DM, Stein JF (1993) Is the cerebellum a Smith predictor? J Mot Behav 25:203–216

    PubMed  Google Scholar 

  • Moore KL (1992) The upper limb. In: Clinically oriented anatomy. Williams & Wilkins, Baltimore

  • Ohtsuki T (1981) Inhibition of individual fingers during grip strength exertion. Ergonomics 24:21–36

    CAS  PubMed  Google Scholar 

  • Pascual-Leone A (2001) The brain that plays music and is changed by it. Ann New York Acad Sci 930:315–329

    CAS  Google Scholar 

  • Pascual-Leone A, Dang N, Cohen LG, Brasil-Neto JP, Cammarota A, Hallett M (1995) Modulation of muscle responses evoked by transcranial magnetic stimulation during the acquisition of new fine motor skills. J Neurophysiol 74:1037–1045

    CAS  PubMed  Google Scholar 

  • Penfield W, Rasmussen T (1950) The cerebral cortex of man. MacMillan, New York

  • Rearick MP, Santello M (2002) Force synergies for multifingered grasping: effect of predictability in object center of mass and handedness. Exp Brain Res 144:38–49

    Article  PubMed  Google Scholar 

  • Rouiller EM (1996) Multiple hand representations in the motor cortical areas. In: Wing AM, Haggard P, Flanagan JR (eds) Hand and brain. The neurophysiology and psychology of hand movements. Academic Press, San Diego, CA, pp 99–124

  • Schieber MH (2001) Constraints on somatotopic organization in the primary motor cortex. J Neurophysiol 86:2125–2143

    CAS  PubMed  Google Scholar 

  • Schieber MH, Santello M (2004) Hand function: peripheral and central constraints on performance. J Appl Physiol 96:2293–2300

    Article  PubMed  Google Scholar 

  • Shim JK, Latash ML, Zatsiorsky VM (2003) Prehension synergies: trial-to-trial variability and hierarchical organization of stable performance. Exp Brain Res 152:173–184

    Article  PubMed  Google Scholar 

  • Tanosaki M, Hashimoto I, Iguchi Y, Kimura T, Takino R, Kurobe Y, Haruta Y, Hoshi Y (2001) Specific somatosensory processing in somatosensory area 3b for human thumb: a neuromagnetic study. Clin Neurophysiol 112:1516–1522

    Article  CAS  PubMed  Google Scholar 

  • Thach WT, Goodkin HP, Keating JG (1992) The cerebellum and the adaptive coordination of movement. Ann Rev Neurosci 15:403–442

    Article  CAS  PubMed  Google Scholar 

  • Waberski TD, Gobbele R, Kawohl W, Cordes C, Buchner H (2003) Immediate cortical reorganization after local anesthetic block of the thumb: source localization of somatosensory evoked potentials in human subjects. Neurosci Lett 347:151–154

    Article  CAS  PubMed  Google Scholar 

  • Zatsiorsky VM, Li Z-M, Latash ML (1998) Coordinated force production in multi-finger tasks. Finger interaction, enslaving effects, and neural network modeling. Biol Cybern 79:139–150

    Article  CAS  PubMed  Google Scholar 

  • Zatsiorsky VM, Li Z-M, Latash ML (2000) Enslaving effects in multi-finger force production. Exp Brain Res 131:187–195

    Article  CAS  PubMed  Google Scholar 

Download references

Acknowledgements

We are grateful to Dr. Mary Marzke for fruitful discussions and to the two anonymous reviewers for many productive critical comments. This study was supported in part by NIH grants AG-018751, NS-35032, and AR-048563.

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Authors and Affiliations

  1. Department of Kinesiology, The Pennsylvania State University, University Park, PA , 16802, USA

    Halla Olafsdottir, Vladimir M. Zatsiorsky & Mark L. Latash

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  1. Halla Olafsdottir
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  2. Vladimir M. Zatsiorsky
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  3. Mark L. Latash
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Correspondence to Mark L. Latash.

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Olafsdottir, H., Zatsiorsky, V.M. & Latash, M.L. Is the thumb a fifth finger? A study of digit interaction during force production tasks. Exp Brain Res 160, 203–213 (2005). https://doi.org/10.1007/s00221-004-2004-0

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  • DOI: https://doi.org/10.1007/s00221-004-2004-0

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