Respiration and olfactory bulb unit activity in the unrestrained rat: Statements and reappraisals

摘要: The activity of 26 olfactory bulb units, including 19 mitral, 5 granular and 2 external plexiform cells, was recorded in unrestrained rats associating food odor stimuli/isoamyl acetate to a reward/no reward. respiratory transduced from the intranasal air pressure used as time-base analyze unit discharge. patterning neuron presented histograms built sequences 30 successive cycles each resolved into equal bins. 64 were defined by low or high frequency stimulation. In resting conditions, 15 (13 mitral) units displayed significant patterning, mainly characterized absolute relative phases maximal minimal cycle. Six typical groups could be accordingly. Increased erased except most units. adjacent mitral cells showed that various types distributed neuronal network with lateral recurrent inhibition, where noise introduced at inspiration. data verified spatial temporal distribution input elicited stimuli created local interferences, modifying activity. odor-induced changes (R1 responses) consistent typology itself; they selective habituated rapidly. transient R1 also give rise an R2 firing, atypical, regular lasting, when intake. Possible functional interpretations these phenomena are presented.