Thorwald O. Feuerabendt, Gerhard Breutel, Johannes Sagunsky, Manfred Gahr
MPI für Verhaltensphysiologie Seewiesen, Post Starnberg D-82319 Seewiesen,
Phone +49 8157-932382, FAX +49 8157 932 400

INTRODUCTION We need telemetry for transmission of physiological data. Sex differences as the basis of investigation can help to elucidate phenomenons correlations in neurobiology and ethology. Electrophysiology of behaviour is one element in such endeavour. Canaries (Serinus canaria) song behaviour supplies a suitable objekt of research.Both singing and, nervous system show sex-specifity.

METHODS To capture a great deal of parameters singing has to be free of artificial exertion of influence. To that purpose we evolve a special recording equipment. A miniature FM transmitter which weighs below 2 g (under construction about 1 g or less) should broadcast spikes out off the vocal control system ( some forebrain areas) of songbirds. When we are doing this, birds are absolutely free of disturbance in mobility and any form of anesthesia or stimulant.

RESULTS A range of more than 10 metres seems to be possible. There is no disturbance in song behaviour by transmitter-application. Longterm recordings (about 1 month) of high quality are within reach.