nucleation

LIT-1466: Motivational trade-offs and modulation of nociception in bumblebees

2 min read

Properties4
StatusActive — read 2026-10-23 (NOTE-1114): in full, from the published version (CC BY 4.0) in LSE Research Online, with the 2025 correction and the authors' deposited data. Worth reading as the cleanest published motivational trade-off in an insect. Bees chose between heated (55 °C) and unheated feeders. They took the heated, high-sucrose feeders less as the unheated alternative got sweeter, and more steeply than when nothing was heated. The trade-off relied on learned colour cues, so it is central. At this one cost the data are graded, not thresholded, and the design varies only the resource, so it cannot show a threshold in cost.
Tagsemotion-and-affect, motivation, consciousness
SupportsCLAIM-435 — Veit's common currency and ALARM's override are two regimes of one ordering serving as the negotiation's potential, compensatory and overriding, so their rivalry over what the first felt valence did becomes the question whether the earliest potential orderings are continuous: in motivational trade-off experiments, a continuous indifference curve between a noxious cost and a resource for Veit, a discontinuity at a threshold beyond which no resource buys the cost for ALARM; only a graded override, deciding at every level of its own intensity, lacks a currency altogether
Cited as “paper” byNOTE-1114 — Motivational trade-offs and modulation of nociception in bumblebees

Graph View

Matilda Gibbons, Elisabetta Versace, Andrew Crump, Bartosz Baran & Lars Chittka (2022), Proceedings of the National Academy of Sciences 119(31):e2205821119 — DOI-10.1073/pnas.2205821119

Key takeaways

  • Design (p. 1). Two high-quality feeders (40% sucrose) against two alternatives: “different groups of bees were offered 10%, 20%, 30%, or 40% sucrose solution (Fig. 1).” Each bee was run unheated, then “with the high-quality feeders at 55 °C (heated) and the alternative feeders unheated.” Feeders were marked by colour.
  • Result (p. 1). “Bees avoided noxious feeders when the unheated feeders contained high sucrose concentrations, but progressively increased feeding from noxious feeders when the sucrose concentration at unheated feeders decreased.” The drop in feeding on the 40% feeders as the alternatives got richer was steeper when they were heated (p. 2). “Thus, bees traded off their motivation to avoid noxious heat against their preference for high sucrose concentrations.”
  • Central, not peripheral (p. 2). Landings without feeding fell between the first and last bouts, so the bees chose by learned colour/spatial cues, not by tasting each feeder.
  • Inference (pp. 1, 3). “This ability is consistent with a capacity for pain experiences in insects,” although “it is not a formal proof.”
  • Corrected (2025). “We reported the output of the wrong model in the results section and in Fig. 1.” One statistic changes, from z = −2.068, P = 0.039 to z = −2.132, P = 0.033. The conclusion stands.

Standing in the record

Filed on 2026-10-23 for THEORY-101’s comparative test and CLAIM-435’s recasting of it. The bearing is set out in NOTE-1114. In short:

  • at the one cost tested, the bees’ choices vary gradually with the resource and show no override;
  • because cost is not varied, the study cannot show a level threshold or an indifference curve;
  • 55 °C did not stop any bee taking a 30-point sucrose advantage.

No instruction for machine-learning practice; nothing here belongs in the anthology.

Backlinks