By Zaira Cattaneo
Can a blind individual see? The very notion turns out paradoxical. the following the authors research the results of blindness and different different types of visible deficit at the improvement and functioning of the human cognitive system.
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Additional info for Blind vision : the neuroscience of visual impairment
1999), ERPs were also recorded that were consistent with the behavioral results: in fact, blind participants showed a steeper N1 gradient compared to the sighted controls for the peripheral but not for the central sounds, indicating a sharper attentional tuning mechanism operating at early spatial attention stages (ﬁrst 100 ms) in blind individuals. , Bavelier, Tomann et al. 2000). It might be argued that differences in compensation for central and peripheral space are only indirect, rather reﬂecting an increase in the level of task difﬁculty, given that the task is more complex in the periphery than in the central visual ﬁeld.
Blind subjects outperformed the sighted in both conditions; however, when the perceptual threshold of sighted and blind subjects was matched by adding noise, memory spans of the two groups overlapped. These data suggest that the blind subjects’ improved memory abilities depend on improved stimulus processing at an early stage of encoding, rather than on superior abilities at subsequent memory-related processes. In fact, improved sensory encoding may allow the sequencing and “chunking” that support better memory performance, a hypothesis also put forward by Raz et al.
2008) have compared blind and sighted individuals in a haptic angle-discrimination task, depending on both cutaneous and proprioceptive feedbacks. Participants had to actively scan with their right index ﬁnger pairs of two-dimensional angles, identifying the larger one. The same exploratory strategy (a single contour-following movement over the angles) was imposed on all subjects to ensure that all relied on the same information in making their sensory decisions. Alary et al. (Alary, Goldstein et al.
Blind vision : the neuroscience of visual impairment by Zaira Cattaneo