Risky choice in pigeons and humans: a cross-species comparison.
Quick token exchange makes both pigeons and humans prefer variable waits; delaying the swap wipes the preference out.
01Research in Context
What this study did
Doughty et al. (2010) let pigeons and college students pick between two token piles. One pile gave tokens after a fixed wait. The other pile gave tokens after a variable wait that could be shorter or longer.
The birds and people could trade tokens right away in one condition. In another condition they had to wait before trading. The team counted which pile each species chose most often.
What they found
Both birds and humans liked the variable pile when they could cash in tokens at once. They accepted the risk of a longer wait for a chance at a shorter wait.
When token trade-in was delayed, the love for variable waits faded. The two species now picked the fixed pile more often. The gap between bird and human choice almost vanished.
How this fits with other research
Steege et al. (1989) first showed that pigeons follow delay-reduction rules while humans chase the highest overall payoff. Doughty et al. (2010) tighten the procedure and find the species act alike when exchange is quick. The new study updates the older one by showing timing of payoff matters more than species.
Madden et al. (2003) found humans pick variable delays only when time budgets are tight. Doughty et al. (2010) echo this: variable delays look good only when tokens can be spent right away. Both papers say context, not math skill, drives risky choice.
Calamari et al. (1987) showed pigeons stay logical when picking between fixed and variable delays. Doughty et al. (2010) add humans to the same test and find similar orderly patterns, backing the idea that basic choice rules cross species lines.
Why it matters
If you run token boards or point systems, let learners cash in quickly at first. Fast payoff keeps motivation high and makes risky choices feel safe. Later, stretch the exchange delay to teach patience and reduce impulsive picks. The bird data say this trick works across species; your clients are likely no different.
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02At a glance
03Original abstract
Pigeon and human subjects were given repeated choices between variable and adjusting delays to token reinforcement that titrated in relation to a subject's recent choice patterns. Indifference curves were generated under two different procedures: immediate exchange, in which a token earned during each trial was exchanged immediately for access to the terminal reinforcer (food for pigeons, video clips for humans), and delayed exchange, in which tokens accumulated and were exchanged after 11 trials. The former was designed as an analogue of procedures typically used with nonhuman subjects, the latter as an analogue to procedures typically used with human participants. Under both procedure types, different variable-delay schedules were manipulated systematically across conditions in ways that altered the reinforcer immediacy of the risky option. Under immediate-exchange conditions, both humans and pigeons consistently preferred the variable delay, and indifference points were generally ordered in relation to relative reinforcer immediacies. Such risk sensitivity was greatly reduced under delayed-exchange conditions. Choice and trial-initiation response latencies varied directly with indifference points, suggesting that local analyses may provide useful ancillary measures of reinforcer value. On the whole, the results indicate that modifying procedural features brings choices of pigeons and humans into better accord, and that human-nonhuman differences on risky choice procedures reported in the literature may be at least partly a product of procedural differences.
Journal of the experimental analysis of behavior, 2010 · doi:10.1901/jeab.2010.93-27