[Spatio-temporal study of the electrical activities of the olfactory bulb of the trout Salmo gairdneri].

The electrical stimulation of the olfactory nerve allows to record steady field potentials in the olfactory bulb of the trout Salmo gairdneri. 200 microns separate recording points which are localised on a tridimensional network. At 18, 24, 30 and 38 ms the amplitudes are measured and plotted in a calculator which determines the isopotentials in any vertical, horizontal and sagittal planes.

[Use of the bioelectric activity of the olfactory bulb of the trout Salmo gairdneri in the detection of pesticides].

The olfactory bulb responses induced by nasal infusion of three pesticides (Atrazine, Lindane, Ethyl Parathion) were studied in the rainbow Trout, Salmo gairdneri. Amplitude and frequency changes were characteristic for each solution tested at concentrations ranging between 10 ng/l and 1 mg/l.

[Relationship between the incremental and behavioral responses evoked by stimulation of the ventral anterior nucleus of the rat thalamus].

Low frequency stimulation of nucleus Ventralis Anterior thalami in unanesthetized rats elicits incremental responses and produces, in some conditions, characteristic behavioral reaction. Stimulation thresholds giving rise to behavioral reaction are higher than those allowing to find electrocortical responses. The analysis of their evolution discloses changes which are bound to both of the following parameters: the stimulation frequency and the arousal.