Since constructional apraxia is often concomitant
with brain lesions, the study of constructional tasks in
the non-brain-damaged population might be useful in helping
to disentangle other causal factors. This paper explores
the performance of illiterate individuals (N =
29) as compared to that of semiliterates (N =
21) and literates (N = 23) in order to see the
effect of reading and writing abilities on constructional
tasks. Each participant was asked to construct 4 figures
based upon models having varying degrees of complexity.
A global criterion of lack of fidelity and several analytic
criteria (related to distortion, rotation, and disarticulation
errors) were used to evaluate performance. Although illiterates
generally made more errors than semiliterates and semiliterates
more than literates, only some of these differences were
statistically significant. Significant differences were
found for lack of global fidelity and disarticulation errors
when all 4 figures were considered together. Subtler data
emerged with respect to single figures. (JINS,
2000, 6, 668–672.)