In most subtests it took developmental dyscalculia participants longer to respond than the control participants, both in number comprehension and production (particularly in comparing digits, counting, series, and fraction comparison), and in calculation (particularly in simple operations, horizontal operations and fractions).
Hence, the present study revealed comparable exogenous orienting ability in developmental dyscalculia participants and controls.
In addition, developmental dyscalculia participants were slower to respond in the non-cued conditions.
First, it is well known that developmental dyscalculia participants present deficits in retrieval of arithmetical facts [ 4- 8].
Rubinsten and Henik [ 10, 11] examined developmental dyscalculia participants using the numerical Stroop task and discovered a lack of facilitation.
Developmental dyscalculia participants presented a unique attention profile in two attentional networks--the executive and the alerting networks.
As mention earlier, developmental dyscalculia participants presented abnormalities in the gray matter volume of frontal areas [ 61].
The malfunction of the intraparietal sulcus in developmental dyscalculia participants was the basis of this prediction [ 16- 18].
It is also important to examine the attentional abilities of developmental dyscalculia participants in every attentional network independently.
However, contrary to our hypothesis, no group difference was found in the orienting between the developmental dyscalculia participants and controls.
Based on earlier findings [e.g., [ 15- 17]], we hypothesized that developmental dyscalculia participants would present an abnormal pattern of attentional orienting.
