Conditioned taste aversion in humans using motion-induced sickness as the US.

Area of Science:

• Behavioral Neuroscience
• Human Psychology
• Sensory Science

Background:

• Conditioned taste aversion (CTA) is a learned response where an organism avoids a flavor associated with illness.
• Latent inhibition (LI) is a phenomenon where prior exposure to a stimulus reduces its ability to form an association later.
• Motion sickness, often induced by rotation, can serve as an unconditioned stimulus to create aversions.

Purpose of the Study:

• To demonstrate conditioned taste aversion (CTA) in humans.
• To investigate latent inhibition (LI) of CTA using rotation-induced motion sickness.
• To explore the role of flavor familiarity in the development of CTA.

Main Methods:

• A 2x2 factorial design manipulated flavor familiarity (familiar vs. novel) and rotation (rotation vs. no rotation).
• Participants consumed a familiar or novel flavored beverage before or after rotation.
• Taste aversion was measured by the amount of beverage consumed when re-presented 2 hours later.

Main Results:

• Participants exposed to rotation consumed significantly less of the beverage, demonstrating CTA.
• Rotated participants pre-exposed to a novel flavor showed less aversion than those pre-exposed to a familiar flavor, indicating LI.
• Motion sickness symptoms, though present during rotation, subsided by the time of beverage re-presentation.

Conclusions:

• Rotation-induced motion sickness effectively elicits CTA in humans.
• Latent inhibition protects against CTA, particularly when the taste stimulus is familiar prior to the aversive experience.
• Findings have implications for understanding and potentially treating chemotherapy-induced food aversions.