We therefore agree with the sentiments of Bailey et al. (1) and
Daly (2): Our study should not be viewed as the definitive study
on this topic but as a proof of concept, which should propel
researchers to exploit this unique sample to its fullest advantage.
Further research using noncognitive measures, as well as alternative
spatial measures would prove invaluable in addressing
some of the shortcomings pointed out by Bailey et al. (1) and
Daly (2). Moreover, such research would reveal the generality of
our results and could focus activist efforts on traits that are most
amenable to nurture. Also, if the measures are chosen to be
more or less gender-dimorphic and more or less influenced by
motivation, stereotype threat, and training, for example, this
research, in addition to addressing some of the astute criticisms
of Bailey et al. (1) and Daly (2), could also reveal mechanism,
which would likewise be invaluable for focusing activists' efforts.
We welcome collaboration with psychologists and anthropologists,
such as the experts to whom this letter replies, to help
us develop such measures of spatial and nonspatial cognitive
abilities that are easy to explain and quick to implement, to take
full advantage of this unique sample.