can siamese fighting fish change colors6 responses per hr. For Fish 2A, F1, and F2, responding reduced substantially during EXT. For these same fish, responding recovered when the FR 1 time table was reinstated. Fish 4A spoke back at lower rates in the course of the FR 1 time table than did any other fish. During EXT, response rates for Fish 4A decreased a little bit, and basically toward the tip of the EXT condition, relative to these during the previous FR 1 schedule. After a couple of next sessions of the return to the FR 1 agenda, however, reaction rates were considerably higher for each fish than during the preceding EXT condition.