In the absence of visual input, the question arises as to how complex spatial abilities develop and how the brain adapts to the absence of this modality. We explored navigational skills in both early and late blind individuals and structural differences in the hippocampus, a brain region well known to be involved in spatial processing.…

This study compared participants who were congenitally visually impaired and those who became visually impaired later in life in a spatial memory task. The latter showed less efficient visuospatial processes than did the former. However, these differences were of a quantitative nature only, indicating common cognitive mechanisms that can be…

The study examined whether spontaneous variations in the frame of reference occurring over time have a more substantial effect on haptic mental rotation abilities of four blindfolded sighted subjects than of four adventitiously blind subjects. Results indicated the mental rotation functions for the two groups were virtually identical. (Author/DB)

The structure of spatial representation in four congenitally and three adventitiously blind 11-year-old children was examined by means of pointing, mapping, drawing, and spatial reasoning on two simple routes over repeated trials. (Author)

Performance by congenitally blind, adventitiously blind, and sighted persons on three types of tasks (manipulatory, simple locomotion, and complex locomotion) was assessed. The three groups tended to perform equivalently. Results offer little evidence of a set of spatial processes that rely on past visual experience and are applicable to a broad…

Meta-analysis of the literature (47 studies) comparing spatial task performance of blind and sighted subjects found that early onset (of blindness) groups generally showed poorer performance than either the late onset or the sighted groups. (Author/DB)

Superior performance by adventitiously blind Ss relative to congenitally blind Ss appeared on tasks where the stimuli were complex, familiar and/or apprehenced with arm's length of the body, but not on tasks where the stimuli were relatively simple, novel, and/or apprehenced only through locomotion. (Author/MC)

An easy-to-use objective method for evaluating a blind person's knowledge about the spatial layout of a locale was used with 10 adventitiously blind adults. Preliminary evidence indicated that the representations of spatial knowledge generated from the scaling procedures are related to the person's mobility performance in that space. (Author)

A study involving 23 blind students (6-12 years old) revealed that age at onset of blindness did not appear to be critical in mastery of space concepts. One-third of the Ss exhibited atypical spatial development, g mastering relative positions of left and right before mirror-image orientation. (Author/CL)

Children and adolescents (n=40) with congenital or adventitious blindness were exposed to two unfamiliar environments. Evaluation of subjects' spatial representations (through construction of models and estimates of distance) found that age appeared to be more important than learning in their development of spatial representation skills. (DB)

Differences in how the two hemispheres of the brain handle spatial information were studied with blind subjects and blindfolded sighted subjects. The performances of all groups declined as the relative disorientation between the target and its duplicate increased, suggesting that visual imagery is not crucial to mental rotation. (Author/SEW)

Based upon 15 interviews, the paper discusses specific educational and social problems as perceived by nine brain injured learners (14-24 years old), their teachers, families, and peers. Interview excerpts illustrate executive functions of self-awareness, self-evaluation, and self-monitoring; the effects on families; and student difficulties in…