Vocabulary skill: single-case assessment of automaticity of word recognition in a timed lexical decision task

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Abstract
This study illustrates, in the context of vocabulary assessment research, a procedure for analysing a single subject's variability of response times (RTs) in a simple, timed lexical decision task. Following the interpretation developed in Segalowitz and Segalowitz (1993) for RT variability as reflection of the automatic/controlled nature of underlying processing mechanisms, it was possible to draw conclusions about the extent to which second language English word recognition in this subject was subserved by automatic as opposed to controlled processes. The study also examined the development of automaticity in word recognition skill for a small, selected vocabulary as a function of reading experience during a three-week testing period. The general implications of this methodology for assessing vocabulary skill in a single case are discussed.