Discrimination learning in a foraging situation.

Researchers let rats hunt for hidden peanut patches in a lab arena. Some patches gave off a smell or a light. The team changed things like cue strength and patch location to see how well the rats learned which cues meant food.

This was basic discrimination training, but set up like a treasure hunt.

The rats figured out which cues marked the peanut spots. When the researchers tweaked the cues or moved the patches, the rats' choices got shakier. Stronger or clearer cues made the discrimination stick better.

Thompson et al. (1971) also taught rats a spatial discrimination, but with sounds and levers. Both studies show that putting the cue close to the payoff spot speeds learning.

White (1979) found that sound location can override the official rule. Together with Sievert et al. (1988), this warns us that spatial layout can strengthen or weaken cue control.

Anonymous (1995) looked at how rats divide time between food sites. Their matching-law result and L's cue result sit side-by-side: animals first notice the cue, then allocate effort according to payoff rate.

When you set up discrimination tasks for learners, stick the S+ cue right next to the reinforcer source. If you later fade or move the cue, expect brief confusion and plan extra trials. These rat data remind us that both cue clarity and physical closeness drive clean stimulus control.