The article by May et al1  is indeed an important article with interesting findings, and we apologize for not discussing them in our current article.

The Test for Reception of Grammar used by May et al,1  however, is not a measure of IQ or cognition. The Test for Reception of Grammar is a test of English grammar comprehension. The term IQ has a formal meaning, referring specifically to the IQ obtained by administering the full suite of subtests within the Wechsler batteries (or other versions such as Stanford-Binet). It is also possible to obtain a verbal IQ, if all the subtests within the verbal domain of the Wechsler batteries are administered. These verbal subtests, however, relate to verbal reasoning abilities, not grammar or other aspects of English language.

English grammar comprehension is not regarded by neuropsychologists as a cognitive domain because language ability is highly culture specific and dependent on many noncognitive abilities. Although cognition certainly contributes to language, it is incorrect to infer cognitive deficits from impairments in a test of grammar on its own. Even in the current article, the Matrix Reasoning test in which the effect was observed is the only direct measure of cognition used. The other 2 measures were both language-based and only loosely defined as tests of cognition.

None of this, however, detracts from the important findings of May et al,1  which will indeed be referenced and discussed in an upcoming article in which grammar comprehension has direct relevance to the topic of interest.

, et al
Breastfeeding and maternal alcohol use: prevalence and effects on child outcomes and fetal alcohol spectrum disorders
Reprod Toxicol

Competing Interests

CONFLICT OF INTEREST: The author has indicated she has no potential conflicts of interest to disclose.