Abstract
Two techniques for the measurement of spontaneous locomotor activity in individual Drosophila are compared by measuring seven inbred lines and three selected lines in each method. The two techniques appear to be measuring a similar and overlapping array of components of activity. It is suggested that the time-sampling technique may be more efficient for measuring activity than is the open-field tests. Two lines showing extreme scores in both methods are tested on a measure of dispersal within a limited space. The difference in dispersal is consistent with that found for individual activity. This result indicates that the behaviour measured in individuals is of relevance to the organism and is not simply an artefact of the testing environment.
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