Abstract
The distribution of four neuroactive substances was studied in the telencephalon of the collared dove using enzyme- and immunohistochemistry. The distribution of acetylcholinesterase and dopamine was similar to that described in other birds. Galanin-immunoreactive fibres were found mainly in the paleostriatum primitivum , the medial part of the parolfactory lobe (LPO) and the lateral septal nucleus; galanin may interfere with acetylcholine activity. Intense gastrin releasing peptide (GRP)-immunoreactivity was found in the neuropil of LPO, the ventral paleostriatum and the caudal archistriatum; further GRP-immunoreactive varicosities were found in the neostriatum and the hyperstriatum ventrale - particularly in its medial part - whereas GRP-immunoreactive cells occurred in the medial neostriatum, the hyperstriatum accessorium and the ventral archistriatum. These data help to define more precisely several functional telencephalic systems, but no indications for specific centers with a role in vocalization were found.
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