Average uncertainty as a determinant of observing behavior.

Pigeons could peck a key to see a colored light for 20 seconds. The light told them if food was coming or not. The chance of food varied from 0% to 100% across conditions. Researchers counted how often the birds pecked to look at the light.

Pecks peaked when food came about 40% of the time. Birds hardly pecked when food was certain (0% or 100%). The graph made an upside-down U. Uncertainty itself kept the birds watching.

Jenkins et al. (1973) ran the same task first. They showed the food-cue light was a reinforcer on its own. Thomson (1974) adds the curve: attention is strongest in the middle, not at the ends.

Jason et al. (1985) moved the test to adult humans. People only watched bad-news cues when those cues helped them work faster. The two studies agree: stimuli linked to better outcomes hold attention; pure uncertainty does not.

Allan et al. (1994) later let pigeons choose between 50% and 100% payoff keys. With short delays, birds picked the risky key. Their data line up with the 1974 peak: moderate uncertainty can beat certainty when the signal has conditioned value.

Keep your reinforcement schedule slightly unpredictable. A 40% chance keeps eyes on you and your cues. Too much certainty or too little payoff drops attention. Try mixing in random easy trials between hard ones to hold client focus without frustration.