Response or Comment
Husaim and Cohen's focus (Merrill-Palmer Quarterly, 1981, 27, 443–456) on the learning of ill-defined categories by infants is securely motivated. Still, some of the particular questions they pursue—namely, how many dimensions are used to form the categories and what is the salience hierarchy of the dimensions—are tricky and perhaps misleading. Underlying their design and analysis is the basic assumption that the dimensions or attributes of the stimulus as defined by the experimenter have psychological reality for the infants. This assumption is questioned. Infants may perceive different attributes in the stimulus or they may not articulate the stimulus into attributes at all.
Deborah G. Kemler Nelson.
"New Issues In The Study Of Infant Categorization: A Reply To Husaim And Cohen".