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Rats can discriminate illuminance, but not magnetic fields, as a stimulus for learning a two‐choice discrimination

In each of the two experiments, nine rats were trained for 64 trials (eight trials per day) to determine if they could acquire a two‐choice discrimination based on a specified discriminative stimulus (SD). In one experiment, the SD was a change in ambient illumination, while in the second experiment the SD was a change in the combination of sinusoidal 60 Hz and static magnetic field (MF) and any cues attendant to energizing the coils that produced the MF exposure. The rats that had a change in illuminance as the SD learned the two‐choice task easily, P < .001, whereas the rats having a change in MFs as the SD did not. Bioelectromagnetics 23:545–549, 2002. © 2002 Wiley‐Liss, Inc.