1. Ingestion of environmentally contaminated Lake Ontario salmon by laboratory rats increases avoidance of unpredictable aversive nonreward and mild electric shock.
- Author
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Daly HB, Hertzler DR, and Sargent DM
- Subjects
- Animals, Appetitive Behavior drug effects, Discrimination Learning drug effects, Male, New York, Orientation drug effects, Rats, Rats, Inbred Strains, Arousal drug effects, Avoidance Learning drug effects, Feeding Behavior drug effects, Salmon, Taste drug effects, Water Pollutants toxicity, Water Pollutants, Chemical toxicity
- Abstract
To determine what behavioral changes are caused by consumption of Lake Ontario salmon, a 30% diet of Lake Ontario or control Pacific Ocean salmon was fed to rats for 20 days. In Experiments 1 and 2 (preference-for-predictability E-maze test), rats fed Lake Ontario salmon developed a preference for predictable food rewards more quickly than did the control rats. In Experiments 3 (passive avoidance) and 4 (conditioned suppression), rats fed Lake Ontario salmon suppressed responding to food far more after the introduction of mild electric shocks than did control rats. All results supported the hypothesis that ingestion of Lake Ontario salmon, contaminated with polychlorinated biphenyls, mercury, lead, etc., increases the reactivity of rats to aversive events. The results were successfully simulated by DMOD, a mathematical model of learning, using the assumption that rats fed Lake Ontario salmon find unpredictable nonreward and mild shock more aversive.
- Published
- 1989
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