Abstract
Cats with lesions of the dorsal columns at the cervical level were compared to sham-operated controls in their ability to jump over barriers while being carried on a moving conveyor belt. The results showed that cats with the lesions fail to initiate jumping movements at the appropriate time even when it is visually obvious that they have to be made. The cats are consistently carried by the conveyor belt directly up to the barrier, so that they make contact with it before jumping over. The paws of two cats were jammed between the conveyor belt and the rear edge of the apparatus because of this failure to begin the response at the appropriate time. In contrast, the control cats usually initiate their jump at a considerable distance in front of the barrier and thereby avoid making contact with it. The data suggest that the dorsal column projection system is necessary for the anticipatory components of sequential behavior patterns.
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