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Dorsomedial pallium lesions impair taste aversion learning in goldfish.

Abstract：

:The present work shows that the dorsomedial telencephalic pallium of teleost fish, proposed as homologous to the amygdala of mammals, is involved in taste aversion learning (TAL). To analyze the behavioral properties of TAL in goldfish, in Experiment 1, we used a delayed procedure similar to that employed with mammals, which consists of the presentation of two flavors on different days, one followed by lithium chloride and the other by saline, both after a 10-min delay. The results showed that goldfish developed a strong aversion to the gustatory stimulus followed by visceral discomfort and that, as in mammals, this learning was rapidly acquired, highly flexible and maintained for a long time. Experiment 2 showed that dorsomedial pallium lesions and the ablation of the telencephalic lobes impaired the acquisition of taste aversion in goldfish, whereas damage to the dorsolateral pallium (hippocampus homologue) or cerebellar corpus did not produce significant changes in this learning. Experiment 3 showed that these TAL deficits were not due to a lesion-related disruption of taste discrimination; goldfish with telencephalon ablation were able to learn to distinguish between the two tested flavors in a differential conditioning procedure. These functional data demonstrate that the dorsomedial pallium in teleosts is, like the amygdala, an essential component of the telencephalon-dependent taste aversion memory system and provide further support concerning the homology between both structures.

journal_name

Neurobiol Learn Mem

journal_title

Neurobiology of learning and memory

authors

Martín I,Gómez A,Salas C,Puerto A,Rodríguez F

doi

10.1016/j.nlm.2011.06.003

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

297-305

issue

2

eissn

1074-7427

issn

1095-9564

pii

S1074-7427(11)00114-6

journal_volume

96

pub_type

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