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Selective involvement of the goldfish lateral pallium in spatial memory
C Broglio1, F Rodríguez, A Gómez
1Laboratorio de Psicobiología, Universidad de Sevilla, Sevilla, Spain. cbroglio@us.es
Behavioural Brain Research
|February 25, 2010
Summary
Goldfish spatial learning relies on the lateral pallium (LP). Lesions to the LP impaired spatial memory and reversal learning, while neuronal activity increased in the ventral LP during spatial tasks.
Area of Science:
- Neuroscience
- Comparative Cognition
- Fish Behavior
Background:
- The telencephalic pallium in teleosts plays a role in cognition.
- Understanding the functional specialization of pallial subdivisions is crucial for comparative neuroscience.
Purpose of the Study:
- To investigate the role of specific telencephalic pallium subdivisions in spatial cognition in goldfish.
- To compare the effects of lesions in the lateral (LP), medial (MP), and dorsal (DP) pallium on spatial learning and memory.
- To examine learning-induced changes in neuronal transcription activity in relation to spatial cognition demands.
Main Methods:
- Lesion studies targeting LP, MP, and DP in goldfish.
- Assessment of retention and reversal learning on a spatial constancy task.
- AgNOR staining to measure neuronal transcription activity (nucleolar organizing region size) after training.
Main Results:
- LP lesions selectively impaired spatial task retention and reversal learning.
- MP and DP lesions did not result in significant cognitive deficits.
- Spatial task training increased neuronal transcription activity in the ventral LP, indicated by larger NORs.
- Cue-based training, lacking spatial demands, did not alter transcription activity.
Conclusions:
- The lateral telencephalic pallium is critical for spatial cognition in goldfish.
- Functional similarities exist between the teleost LP and the amniote hippocampus.
- These findings support the homology between teleost LP and amniote hippocampus, advancing comparative neuroanatomy.
