By Yvette Hatwell, Arlette Streri, Edouard Gentaz
The dominance of imaginative and prescient is so powerful in sighted people who contact is typically regarded as a minor perceptual modality. although, contact is a strong instrument which contributes considerably to our wisdom of area and gadgets. Its extensive use by means of blind folks lets them succeed in a similar degrees of data and cognition as their sighted peers.In this booklet, really good researchers current the hot country of data concerning the cognitive functioning of contact. After an research of the neurophysiology and neuropsychology of contact, exploratory handbook behaviors, intramodal haptic (tactual-kinesthetic) talents and cross-modal visual-tactual coordination are tested in babies, little ones and adults, and in non-human primates. those reports difficulty either sighted and blind people so as to recognize even if early visible deprivation modifies the modes of processing house and gadgets. The final part is dedicated to the technical units favoring the college and social integration of the younger blind: Braille studying, use of raised maps and drawings, “sensory substitution” screens, and new applied sciences of conversation tailored for the blind. (Series B)
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Extra resources for Touching for knowing : cognitive psychology of haptic manual perception
381–414). San Diego, CA: Academic Press. Johnson, K. & Hsiao, S. (1992). Tactile form and texture perception. Annual Review of Neuroscience, 15, 227–250. , & Jessel, T. (2000). Principles of neural science. New York: MacGRawHill. Kaas, J. (1991). Plasticity of sensory and motor maps in adult mammals. Annual Review of Neuroscience, 14, 137–167. Kaas, J. (1995). The reorganization of sensory and motor maps in adults mammals. In M. ), The Cognitive neurosciences (pp. 51–71). Cambridge: The MIT Press.
The authors suggest that this extremely rapid cross-modal plasticity would mean the existence of masked haptic inputs into visual cortex in normal human subjects that can be unmasked by visual Edouard Gentaz and Maryse Badan deprivation. Thus, the visually deprived striate and peri-striate cortex would be capable of processing haptic inputs. Further research is needed to confirm these exciting results. . Conclusion The results obtained thanks to cerebral functional imagery thus confirm and put into perspective certain general characteristics established in the literature on cortical organization (cf.
Among these neurons, some are bimodal visual-tactile and respond, for example, to the same spatial localization of the stimulus. For area 5, the neurons are also somaesthetic and motor. The somaesthetic neurons respond to complex stimuli such as the mobilization of several joints or the simultaneous activation of articular afferences and cutaneous receptive fields. The motor neurons are active during movements involving the extension of the arm, or manipulation. Unlike the premotor cortex (cf. below), area 5 does not seem to participate directly in the process of selection of the type of response to command signals (Kalaska 1996).