Pigeons were trained to discriminate between the presence and absence oe a pigeon in photographie displays projected on a response key. Irrelevant cues were reduced as much as possible, while the differences between the objects were of sufficient variety and complexity to ensure that mastery of the discrimination would require the use of a concept. The Ss learned this discrimination very rapidly. On a test given following training, the Ss showed almost complete transfer to new displays containing fancy breeds of pigeons and showed significantly less transfer to new displays containing other species of birds. These results indicate that discrimination was based on a concept of "pigeon. "
When large populations of mice were treated with LSD (2mcg/kg to 30mcg/kg), bufotenine (5mg/kg to 30mg/kg), a cannabis sativa extract (50mg/kg to 100mg/kg), or tetrahydrocannabinol (2mg/kg to 10mg/kg), there was a dramatic change in social behavior. Such treatment produced a significant reduction in aggression, group aggregation, and temporary disruptions of social hierarchies. Hallucinogenic-treated mice placed in normal untreated colonies were hypersensitive to auditory and tactile stimulation and aggregated in small groups apart from the rest of the population. Treatment with saline or BOL-148 produced no significant changes in behavior.
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