Paired-associate learning efficiency was assessed within four low-SES ethnic populations (black, Chinese-American, Latino-American, and white) as a function of presentation conditions and method of measurement (verbal recall vs. pictorial recognition). A mixed-list paired-associate task was administered individually to 40 second grade children from each group. The results revealed substantial effects for presentation conditions, but not for populations. Nevertheless, the pattern of conditions effects differed as a function of both populations and measurement method. An explanation of the results was discussed in terms of the concept of differential memory coding as a function of specific subject characteristics. (References, tables, and figures are appended.) (Author)