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Thus, in the present study children were excluded if they had a receptive language mental age of less than 4 years.
There are, however, a number of exceptions to this general rule of "normal" mental age-appropriate language.
In the autism group, children with a higher mental age were less likely to display actions that expressed jealousy during the play scenario.
This suggests that the ability to learn and apply rules develops with mental age.
Across diagnostic groups, performance on the rule-based conditions was related to receptive language mental age.
These relationships persist beyond a common association with chronological and verbal mental age.
Visuospatial abilities usually lag behind expectations based on mental age.
As expected, we found that receptive language mental age was positively correlated with rule-based categorization ability for all groups of children.
Levels of performance are often benchmarked to chronological or mental age expectations.
These include, for example, concerns with ceiling effects, small sample sizes, broad age ranges, and reliance on mental age scores.
It is possible that nonverbal mental age may be a better predictor of the type of categorization skills assessed by this particular task.
Matching to typically developing controls on the basis of chronological age or mental age raises similar problems.
If we use vocabulary size, we may as well use mental age, for the two are highly correlated.
The mixed model analyses reported below covaried non-verbal mental age.
This suggests common factors underlie these tasks over and above any common association with chronological age and verbal mental age.
