Transitivity, flexibility, conjunctive representations, and the hippocampus. I. An empirical analysis

被引:79
作者
Van Elzakker, M [1 ]
O'Reilly, RC [1 ]
Rudy, JW [1 ]
机构
[1] Univ Colorado, Dept Psychol, Boulder, CO 80309 USA
关键词
transitivity; flexibility; conjunctive representations;
D O I
10.1002/hipo.10083
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
After training on a set of four ordered, simultaneous, odor discrimination problems (A+B-, B+C-, C+D-, D+E), intact rats display transitivity: When tested on the novel combination BD, they choose B. Rats with damage to the hippocampus, however, do not show transitivity (Dusek and Eichenbaum, 1997. Proc Natl Acad Sci U S A 94:71097114). These results have been interpreted as support for the idea that the hippocampus is a relational memory storage system that enables the subject to make comparisons among representations of the individual problems and choose based on inferential logic. We provide evidence for a simpler explanation. Specifically, subjects make their choices based on the absolute excitatory value of the individual stimuli. This value determines the ability of that stimulus to attract a response. This conclusion emerged because after training on a five-problem set (A+B-, B+C-, C+D-, D+E-, E+F-) rats preferred B when tested with BE, but not when tested with BD. The implication of these results for how to conceptualize the role of the hippocampus in transitive-like phenomena is discussed. (C) 2003 Wiley-Liss, Inc.
引用
收藏
页码:334 / 340
页数:7
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