Abstract
Adaptation of the Bayley Scales of Infant Development for the Dutch population has led to an examination of the ‘global dimension’ in the Infant Behavior Record (IBR). Complete protocols of the IBR were obtained for 1211 Dutch infants aged 2–30 months. Principal components analyses with rotated factors of IBR ratings for 14 ages over the entire range indicated that five factors recurred: task orientation, test affect—extraversion, activity, auditory—visual awareness and motor coordination. In addition, a sixth factor, exploration, was also prominent during the first months of life. A factor analysis of the IBR ratings pooled for all 14 ages produced the same uniformity. It is suggested that cluster scores from the IBR have clinical utility, particularly for assessing infant temperament.
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