Abstract
A study of Hull''s speed of locomotion gradient using 207 rats on a straight runway. The results verified Hull''s gradient for conditions set by Hull. However, spaced trials did not give a Hull-type gradient but a flat speed graph. An explanation of the gradients in terms of the beginning rather than in the end of the response was suggested. The typical goal gradient then would be regarded as flat, the Hull-type gradient being due to an inhibitory factor being superimposed on the flat graph.

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