with substance-related disorder, schozophenia, bipolar,
depressive, or anxiety disorders, showed that these
patients had lower scores than normal olunteers[22] and
also after coffee stimulant scores was increase.[23] To our
knowledge, a prior study on the SLCT reported a general
description of performance but did not provide means or
standard deviations of performance on this measure for
children. Moreover, the effect of demographic variables
on SLCT performance had not been previously examined.
However, examination of percentile ranks revealed an
unstable pattern of SLCT performance across age and
gender groups. Age was a stronger predictor than sex for
the SLCT. This study was limited to children and uneven
cell sizes across derived age and sex. Further research
with larger samples is needed to clarify this relation,
perhaps in an adult population. Nonetheless, these
results permit quantitative evaluation of performance
on the SLCT in healthy school children. As the SLCT
is easy to administer in short duration of time and
potentially useful in the assessment of attention, neglect,
and psychomotor ability, it is hoped that these normative
data will increase the use of SLCT in clinical pediatric
populations.
Hence, one possible mechanism can be that the posterior
parietal cortex is known to be important in normal eye
movement control, visuospatial attention, and peripheral
vision—all important components of reading.[25] Attention
tasks that depend on parietal cortex functioning: spatial
attention task,[26] perceptual grouping,[27] and visual search.
[28] It is clear that many of these attention-related functions
contribute to reading. Indeed, selective attention to a word
or string of words requires concentrated focal attention
and controlled shift of attention.
