Foraging honeybees were trained individually in two-choice spatial problems. Differentially rewarded for spatial alternation in Experiment 1 ("win-shift" training), they showed instead a clear tendency to perseverate-that is, to prefer on each trial the location of reward on the immediately preceding trial. On the basis of the results of Experiments 2 and 3, in which one location was rewarded over shorter or longer series of consecutive trials, an associative interpretation of the perseveration found in the first experiment was rejected in favor of an interpretation in terms of short-term spatial memory. Experiment 4, in which the animals were rewarded on each trial for choosing either location, also showed perseveration. Honeybees, like rats, seem to remember a rewarded location recently visited, but tend to return to it rather than, like rats, to avoid it.In recent experiments by Brown and Demas (1994; see also Demas & Brown, 1995), honeybees were studied in an analogue of the radial maze designed by Olton and Samuelson (1976) for the study of short-term memory in rats. Confronted on each trial with an array of six baited targets, the honeybees showed some tendency to avoid targets visited earlier on the trial, from which Brown and Demas concluded that the control of performance by short-term or "working" memory, as known in a variety of vertebrate species, is to be found also in honeybees. The conclusion is difficult, however, to accept in the light of a series of criticisms of the technique employed by Brown and Demas that have been offered by Burmeister, Couvillon, and Bitterman (1995). In subsequent experiments not open to those criticisms, Burmeister et al. used arrays of three or four targets and found only some rather marked position biases that might conceivably have masked any short-term memory effects. They suggested that subsequent work be done in even simpler situations, analogues of the two-choice situations in which the reluctance of rats to return to recently visited locations was first clearly established (see, e.g., Glanzer, 1953;Montgomery, 1952).Ohyama, Couvillon, and Bitterman (1995) trained individual foragers with targets of two different colors, rewarding them on each trial for choosing the nonrewarded color of the immediately preceding trial (alternation or "win-shift" training). The animals did not learn to alternate, but from the very beginning showed instead a reliable tendency to perseverate in the choice of color-that is, to choose on each trial the rewarded color of the im- mediately preceding trial. There was perseveration also in the choice of location. The colored targets between which the animals were permitted to choose on each trial were presented at two fixed locations, each color as often in each location as in the other and as likely to be rewarded in each location as in the other. Although not differentially rewarded either for spatial alternation or for spatial perseveration, the animals showed-again from the very beginning-a reliable tendency to go on each trial to the...