For
instance, in a longitudinal study, Lemelin et al. [16] found that difficult
temperament negatively influenced cognitive ability in a low
psychosocial risk groups (i.e., high family SES) but not in high risk
groups. Another study found that negative temperament at 12 months
actually had a positive impact on cognitive ability at three years old,
but only for infants who developed insecure attachment with their
mothers [19]. To date no identified childcare study has investigated
the role of child temperament on cognitive development.