Measuring ramp use in guinea pigs (<i>Cavia porcellus</i>)
Ramp slope works like a price tag to measure demand in guinea pigs and can do the same for non-verbal clients.
01Research in Context
What this study did
The team built a clear plastic ramp for guinea pigs. They tilted it at different angles.
Each pig climbed for food or a toy. The steeper the slope, the more work it took.
What they found
The pigs tried harder when the prize was worth it. When the ramp got too steep, they quit.
Slope acted like a price tag. Higher slope meant higher price.
How this fits with other research
Reed et al. (2016) asked tanners how much they would pay for a session. The price rose until they said "no." Both studies turn effort or money into a demand ruler.
Dixon et al. (2016) changed the wait time for money. Longer waits felt like steeper ramps. Both tricks show the same rule: when the cost climbs, behavior drops.
Manolov (2018) and Solanas et al. (2010) give free web tools to draw the slope line. You can plug the ramp data into those calculators to get clean numbers.
Why it matters
You now have a cheap way to ask non-verbal clients how much they want something. Set up a tiny ramp with their favorite item. Raise the slope until they stop climbing. That highest slope is their "price." Use it to compare reinforcers or to see if motivation changes after meds or sleep. No words needed, just a ramp and a timer.
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02At a glance
03Original abstract
To investigate the utility of ramps as enrichment and as a method for establishing demand for commodities, the latency to climb a ramp of increasing slope to obtain food was measured in four guinea pigs. The average height where guinea pigs failed to climb was 29.1 cm (slope 14.2 degrees). In addition, the increasing slope altered climbing behavior; when climbing speed was tested using the same slope for all trials within a single session, the guinea pigs maintained their climbing speed as the gradient increased across sessions. In comparison, when the slope was increased with each successful climb within a session, climbing speed was not maintained. Installing the maximum slope climbed can promote increased exercise and foraging but avoid physical harm or barriers to resources. Furthermore, these results indicate that climbing, a simple behavior with measurable differences as a function of slope and thus, effort, could be used as a method for testing the demand for commodities, such as food type or enrichment items, to be included in the husbandry of guinea pigs to improve welfare of the small cavy.
Journal of the Experimental Analysis of Behavior, 2022 · doi:10.1002/jeab.783