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(552) Causal reasoning in rats.   Blaisdell AP, Sawa K, Leising KJ and Waldmann MR.   2006.   Science, volume 311, pages 1020-1022.    Editorial. Rats are smarter than we think.   2006.   Science, volume 311, page 915.   The more significant, but less explored, difference in experiment 1 was between Condition Intervene-N and Condition Intervene-T, P<0.01, probably a reflection of the use of simultaneity in group N but not in group T, such that the strength of association was greater in group N than in group T, and thus less likely to be disrupted by the interventions. Condition Observe-N was greater than Condition Observe-T, but not significantly so, and this trend is consistent with models of working memory.

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(555b) Thalamic connections of the auditory cortex in marmoset monkeys: core and medial belt regions.   De La Mothe LA, Blumell S, Kajikawa Y and Hackett TA.   2006.   Journal of Comparative Neurology, volume 496, pages 72-96.

(556) Single-axon tracing study of corticostriatal projections arising from primary motor cortex in primates.   Parent M and Parent A.   2006.   Journal of Comparative Neurology, volume 496, pages 202-213.

(557) An optimal brain can be composed of conflicting agents.   Livnat A and Pippenger N.   2006.   Proceedings of the National Academy of Sciences of the United States of America, volume 103, pages 3198-3202.

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