MEAN LENGTH OF SPOKEN RESPONSE AS A FUNCTION OF STIMULUS, EXPERIMENTER, AND SUBJECT

Philip A. Cowan · B. A. Hoddinott · Joseph J. Klein

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Language Development and Disorders Early Childhood Education and Development Child and Animal Learning Development

Abstract

Mean length of response (MLR) is the average number of words per remark emitted by Ss in responding to stimuli; in this case the stimuli were pictures. 96 Ss, equal numbers of male and female upperand lower-socioeconomic status children at each of 4 ages (5, 7, 9, and 11), were individually tested by 1 of 2 Es. It was found that the stimulus influenced the length of response; that age, sex, and socioeconomic status effects interacted; and that the E effect interacted with the age and sex of Ss. While few studies now use the MLR measure, current textbooks are consistently drawing invalid conclusions based on previous MLR research. The present results also reemphasize the necessity for including an analysis of E effects in any developmental study.

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1954Design and Analysis of Experiments in Psychology and Education.1957Certain Language Skills in Children 1974Child development and personality 2005Language development in children.1958The Construction and Use of an Occupational Class Scale 1973Psychology of the child 1932The Language Development of the Preschool Child 1963The experimenter: A neglected stimulus object.

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1976Syntax Development in Boys and Girls 1978Do girls talk earlier?: Mean length of utterance in toddlers.1993Conversations With Children Who Are Language Impaired 1992Difference without dominance: Children's talk in mixed- and same-sex dyads 1980Sex Differences in Syntax and Usage in Oral and Written Language 1981The Situation: A Neglected Source of Social Class Differences in Language Use

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