A Neurocomputational Model of an Imitation Deficit Following Brain Lesion
This paper investigates the neural mechanisms of visuo-motor imitation in humans through convergent evidence from neuroscience. In particular, we consider a deficit in imitation following callosal brain lesion, based on the rational that looking at how imitation is impaired can unveil its underlying neural principles. We ground the functional architecture and information flow of our model in brain imaging studies and use findings from monkey brain neurophysiological studies to drive the choice of implementation of our processing modules. Our neural model of visuo-motor imitation is based on self-organizing maps with associated activities. Patterns of impairment of the model, realized by adding uncertainty in the transfer of information between the networks, account for the scores found in a clinical examination of imitation . The model also allows several interesting predictions.
KeywordsSynaptic Weight Tactile Sensor Proprioceptive Information Intraparietal Sulcus Proprioceptive Input
Unable to display preview. Download preview PDF.
- 6.Mühlau, M., Hermsdörfer, J., Goldenberg, G., Wohlschläger, A.M., Castrop, F., Stahl, R., Röttinger, M., Erhard, P., Haslinger, B., Ceballos-Baumann, A.O., Conrad, B., Boecker, H.: Left inferior parietal dominance in gesture imitation: an fMRI study. Neuropsychologia 43, 1086–1098 (2005)CrossRefGoogle Scholar
- 8.Sauser, E., Billard, A.: Parallel and distributed neural models of the ideomotor principle: An investigation of imitative cortical pathways. Neural Networks, Special Issue on The Brain Mechanisms of Imitation Learning 19(3) (2006)Google Scholar
- 9.Billard, A.: Imitation. In: Arbib, M.A. (ed.) Handbook of Brain Theory and Neural Networks, pp. 566–569 (2002)Google Scholar