منابع مشابه
Effects of repeated acquisitions and extinctions on response rate and pattern.
The procedure developed by R. A. Rescorla (2002) was used to study the effects of repeated acquisitions and extinctions of head entry responses into a food cup by rats. In each of 4 20-session phases, food was delivered at the end of particular 30-s auditory and visual stimuli, but not at the end of different 30-s auditory and visual stimuli. Based on response rates to individual stimuli and co...
متن کاملRepeated acquisitions and extinctions in classical conditioning of the rabbit nictitating membrane response.
The rabbit nictitating membrane (NM) response underwent successive stages of acquisition and extinction training in both delay (Experiment 1) and trace (Experiment 2) classical conditioning. In both cases, successive acquisitions became progressively faster, although the largest, most reliable acceleration occurred between the first and second acquisition. Successive extinctions were similar in...
متن کاملPhylogeography of screaming hairy armadillo Chaetophractus vellerosus: Successive disjunctions and extinctions due to cyclical climatic changes in southern South America
Little is known about phylogeography of armadillo species native to southern South America. In this study we describe the phylogeography of the screaming hairy armadillo Chaetophractus vellerosus, discuss previous hypothesis about the origin of its disjunct distribution and propose an alternative one, based on novel information on genetic variability. Variation of partial sequences of mitochond...
متن کاملHominid Adaptations and Extinctions
According to David W. Cameron, the goal of his book Hominid Adaptations and Extinctions is “to examine the evolution of ape morphological form in association with adaptive strategies and to understand what were the environmental problems facing Miocene ape groups and how these problems influenced ape adaptive strategies” (p. 4). Cameron describes himself as being “acknowledged internationally a...
متن کاملMass extinctions and macroevolution
—Mass extinctions are important to macroevolution not only because they involve a sharp increase in extinction intensity over ‘‘background’’ levels, but also because they bring a change in extinction selectivity, and these quantitative and qualitative shifts set the stage for evolutionary recoveries. The set of extinction intensities for all stratigraphic stages appears to fall into a single ri...
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ژورنال
عنوان ژورنال: Japanese Psychological Research
سال: 1974
ISSN: 0021-5368,1468-5884
DOI: 10.4992/psycholres1954.16.29