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Learning reward expectations in honeybees.

Mariana Gil¹, Rodrigo J De Marco, Randolf Menzel

¹Free University of Berlin, Department of Biology/Chemistry/Pharmacy, Institute of Biology/Neurobiology, Berlin, Germany. mgdm04@yahoo.com.ar

Learning & Memory (Cold Spring Harbor, N.Y.)

|July 14, 2007

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Honeybees can develop long-term reward expectations, influencing their foraging behavior. This study shows bees adjust flower inspection based on past sugar reward experiences, even without immediate reinforcement.

Area of Science:

Behavioral Ecology
Animal Cognition
Neuroethology

Background:

Honeybees forage in complex environments, relying on learned associations.
Understanding reward expectation is crucial for deciphering foraging decision-making.

Purpose of the Study:

To investigate if honeybees develop and retain reward expectations.
To determine how sequences of reward experiences affect subsequent foraging behavior.

Main Methods:

Bees were trained to associate colors with sugar rewards in a simulated natural foraging setting.
Behavioral changes were assessed after training, focusing on flower inspection duration.
Experimental design separated signal learning and nutritional effects from subjective reward value impacts.

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Main Results:

Honeybees trained with increasing reward magnitudes showed prolonged flower inspection 24 and 48 hours post-training.
Behavioral changes were not due to stronger signal association or increased/faster feeding.
Results indicate learned expectations, not just associative learning or nutritional status, drive behavior.

Conclusions:

Honeybees demonstrate the capacity for long-term reward expectation development.
These expectations can guide foraging behavior even after a delay and without reinforcement.
Future research will explore the neural underpinnings of this learned expectation in honeybees.