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Homing behavior was tested in pigeons (Columba livia) after removing a portion of the ventrolateral telencephalon, which receives extensive projections from the olfactory bulb and is comparable with the mammalian pyriform cortex. Ablated pigeons show unaffected cardiac responses to odorous stimuli but altered homing behavior. After the operation, the birds were trained by repeated flock releases along with control birds from a site 40 km from the loft. After being released singly from this familiar site, the ablated birds turned out to be unaffected by the operation. In releases from two unfamiliar sites, ablated birds, unlike control birds, were not homeward oriented and were mostly lost. The ablation of the pyriform cortex has the same effect on homing behavior as olfactory deprivation. It can be concluded that the pyriform cortex plays an important role in the specific mechanisms linking olfactory inputs with the navigational response.

Pigeons with ablated pyriform cortex home from familiar but not from unfamiliar sites.