title: Factors influencing the response latencies of subnormal children in naming pictures.
abstract: The times taken to name 56 drawings of objects on five separate occasions were analysed for 21 ESN(M) and 21 ESN(S) children, matched for picture-naming vocabulary. The ESN(S) group not only had a higher mean response latency but also showed greater inter- and intra-subject variance. Nine objects were selected whose names have a Thorndike-Lorge language frequency of 50 words per million or greater, and nine others were selected with a frequency of less than 50 words per million. Each object was drawn in two ways, one giving a two-dimensional outline with the addition of important detail, the other drawing also incorporating cues indicating the depth of the object. An analysis of variance of the children's latencies in naming the selected 36 pictures of 18 objects over five trials indicated that the method of drawing had no effect upon naming latencies. Pictures with high-frequency names were named faster than those with lower frequency names, the ESN(S) group showing a greater rate of increase in naming latency for the lower frequency words than the ESN(M) children. Results were discussed in terms of the Oldfield and Lachman models of lexical memory storage and of the search processes required for the retrieval of names.
mesh_terms: D000293:Adolescent; D002648:Child; D003867:Depth Perception; D005556:Form Perception; D006801:Humans; D008607:Intellectual Disability / Q000523:psychology*; D007360:Intelligence; D008568:Memory; D011939:Mental Recall; D011930:Reaction Time; D014705:Verbal Behavior; D014796:Visual Perception