The effect of rearing environments on the contrafreeloading phenomenon in rats.
A boring early life makes animals work harder for extras, so check client history before setting task difficulty.
01Research in Context
What this study did
Scientists raised two groups of rats in different cages. One group lived in bare cages with only food and water. The other group lived in toy-filled cages with ladders and tunnels.
over the study period, both groups moved to Skinner boxes. The boxes gave free food in one dish. A lever gave extra food pellets. The team counted how often each rat pressed the lever.
What they found
Bare-cage rats quickly learned to press the lever for bonus pellets. They kept pressing even when free food stayed available.
Toy-cage rats mostly ignored the lever. They ate the free food and rarely worked for extras.
How this fits with other research
Kelly (1973) showed hungry rats press less, not more. That seems opposite, but the studies test different things. Hunger hurts hard tasks like avoidance. Boring cages make easy lever pressing feel fun.
Dugan et al. (1995) found that longer wait times cut meal frequency. Both papers show rats tune their effort to match past costs. Empty cages act like high-cost worlds, so rats keep working.
Alsop et al. (1995) worked with kids waiting for candy. Higher candy preference boosted waiting. Toy-cage rats are like kids who already have good toys; extra work just isn't worth it.
Why it matters
Your client's learning history is part of the program. Kids from empty wards or bare homes may jump at simple chores for tokens. Kids from enriched preschools may need tougher tasks or better prizes. Start by checking what they already have, then set the work-to-reward ratio to match.
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02At a glance
03Original abstract
Eight naive rats were reared in enriched or impoverished environments for 39 days after weaning and then lived in operant chambers, in which they could obtain food pellets freely or by lever pressing, for 25 or 30 days. The animals raised in an impoverished environment acquired the bar-press response quickly when placed in the operant chambers and maintained a preference for obtaining food via bar pressing. Animals raised in an enriched environment did not learn to lever press, as demonstrated by low levels of responding and the lack of bar pressing when free food was subsequently removed. It was concluded that restricting animals' postweaning environments facilitated learning in a choice situation, probably because of increased activity levels. The results are interpreted in relation to previous studies on rearing environments and on contrafreeloading.
Journal of the experimental analysis of behavior, 1976 · doi:10.1901/jeab.1976.26-289