Downloaded from rspb.royalsocietypublishing.org on July 20, 2010
8 A. E. Welchman et al. Reaction beats intention
Gowen, E., Stanley, J. & Miall, R. C. 2008 Movement
interference in autism-spectrum disorder. Neuropsycholo-
gia 46, 1060-1068. (doi:10.1016/j.neuropsychologia.
2007.11.004)
Halsband, U., Ito, N., Tanji, J. & Freund, H. J. 1993 The role
of premotor cortex and the supplementary motor area in
the temporal control of movement in man. Brain 116,
243 - 266. (doi:10.1093/brain/116.1.243)
Iacoboni, M., Molnar-Szakacs, I., Gallese, V., Buccino, G.,
Mazziotta, J. C. & Rizzolatti, G. 2005 Grasping the inten-
tions of others with one’s own mirror neuron system.
PLoS Biol. 3, 529 - 535.
Isoda, M. & Hikosaka, O. 2007 Switching from automatic
to controlled action by monkey medial frontal
cortex. Nat. Neurosci. 10, 240 - 248. (doi:10.1038/
nn1830)
Jenkins, I. H., Jahanshahi, M., Jueptner, M., Passingham,
R. E. & Brooks, D. J. 2000 Self-initiated versus externally
triggered movements. II. The effect of movement predict-
ability on regional cerebral blood flow. Brain 123,
1216 - 1228. (doi:10.1093/brain/123.6.1216)
Jones, E. G. 1987 Ascending inputs to, and internal organiz-
ation of, cortical motor areas. Ciba Found. Symp. 132,
21-39.
Kelso, J. A., Southard, D. L. & Goodman, D. 1979 On the
nature of human interlimb coordination. Science 203,
1029 - 1031. (doi:10.1126/science.424729)
Kilner, J. M., Paulignan, Y. & Blakemore, S. J. 2003 An
interference effect of observed biological movement on
action. Curr. Biol. 13, 522 - 525. (doi:10.1016/S0960-
9822(03)00165-9)
Kurata, K. & Tanji, J. 1985 Contrasting neuronal-activity in
supplementary and precentral motor cortex of
monkeys. 2. Responses to movement triggering versus
non-triggering sensory signals. J. Neurophysiol. 53,
142 - 152.
Laplane, D., Talairach, J., Meininger, V., Bancaud, J. &
Orgogozo, J. M. 1977 Clinical consequences of corticec-
tomies involving supplementary motor area in man.
J. Neurol. Sci. 34, 301 - 314. (doi:10.1016/0022-
510X(77)90148-4)
Luce, R. D. 1986 Response times: their role in inferring elemen-
tary mental organization. New York, NY: Oxford
University Press.
Maimon, G. & Assad, J. A. 2006 Parietal area 5 and the
initiation of self-timed movements versus simple reac-
tions. J. Neurosci. 26, 2487 - 2498. (doi:10.1523/
JNEUROSCI.3590-05.2006)
Majsak, M. J., Kaminski, T., Gentile, A. M. & Flanagan,
J. R. 1998 The reaching movements of patients with
Parkinson’s disease under self-determined maximal
speed and visually cued conditions. Brain 121,
755 - 766. (doi:10.1093/brain/121.4.755)
Mushiake, H., Inase, M. & Tanji, J. 1991 Neuronal-activity
in the primate premotor, supplementary, and precentral
motor cortex during visually guided and internally
determined sequential movements. J. Neurophysiol. 66,
705 - 718.
Obhi, S. S. & Haggard, P. 2004 Internally generated and
externally triggered actions are physically distinct and
independently controlled. Exp. Brain Res. 156, 518 - 523.
(doi:10.1007/s00221-004-1911-4)
Obhi, S. S., Matkovich, S. & Chen, R. 2009a Changing the
‘when’ and ‘what’ of intended actions. J. Neurophysiol.
102, 2755 - 2762. (doi:10.1152/jn.00336.2009)
Obhi, S. S., Matkovich, S. & Gilbert, S. J. 2009b
Modification of planned actions. Exp. Brain Res. 192,
265 - 274. (doi:10.1007/s00221-008-1584-5)
Ratcliff, R. 1993 Methods for dealing with reaction-time
outliers. Psychol. Bull. 114, 510 - 532. (doi:10.1037/
0033-2909.114.3.510)
Roland, P. E., Meyer, E., Shibasaki, T., Yamamoto, Y. L. &
Thompson, C. J. 1982 Regional cerebral blood flow
changes in cortex and basal ganglia during voluntary
movements in normal human volunteers.
J. Neurophysiol. 48, 467 - 480.
Romo, R. & Schultz, W. 1987 Neuronal-activity preceding
self-initiated or externally timed arm movements in
area-6 of monkey cortex. Exp. Brain Res. 67, 656 - 662.
Rosenbaum, D. A., Hindorff, V. & Munro, E. M. 1987 Sche-
duling and programming of rapid finger sequences: tests
and elaborations of the hierarchical editor model.
J. Exp. Psychol. Hum. 13, 193 - 203.
Rushworth,M. F. S., Hadland, K. A., Paus, T. & Sipila, P. K.
2002 Role of the human medial frontal cortex in task
switching: a combined fMRI and TMS study.
J. Neurophysiol. 87, 2577 - 2592.
Sinclair, C. & Hammond, G. R. 2009 Excitatory and inhibi-
tory processes in primary motor cortex during the
foreperiod of a warned reaction time task are unrelated
to response expectancy. Exp. Brain Res. 194, 103 - 113.
(doi:10.1007/s00221-008-1684-2)
Smeets, J. B. J. & Brenner, E. 1995 Perception and action are
based on the same visual information: distinction between
position and velocity. J. Exp. Psychol. Hum. 21, 19-31.
(doi:10.1037/0096-1523.21.1.19)
Stanley, J., Gowen, E. & Miall, R. C. 2007 Effects of agency
on movement interference during observation of a moving
dot stimulus. J. Exp. Psychol. Hum. 33, 915 - 926. (doi:10.
1037/0096-1523.33.4.915)
Sumner, P., Nachev, P., Morris, P., Peters, A. M., Jackson,
S. R., Kennard, C. & Husain, M. 2007 Human medial
frontal cortex mediates unconscious inhibition of
voluntary action. Neuron 54, 697 - 711. (doi:10.1016/j.
neuron.2007.05.016)
Waszak, F., Wascher, E., Keller, P., Koch, I., Aschersleben, G.,
Rosenbaum, D. A. & Prinz, W. 2005 Intention-based and
stimulus-based mechanisms in action selection. Exp. Brain
Res. 162, 346-356. (doi:10.1007/s00221-004-2183-8)
Woodworth, R. S. 1899 Psychological monograph supplement
13: the accuracy of voluntary movement. New York, NY:
Macmillan.
Proc. R. Soc. B