Figure 9. Identification of mitral/tufted cells.

A) Typical example of recorded signals. The local field potential (LFP) signal in the granular layer was characterized by the presence of a high amplitude wave at the same respiratory frequency at which fast oscillations were superimposed during odor stimulation. The intracellular discharge activity appeared spontaneously and was synchronized to the respiratory rhythm during odor stimulation. Top: LFP signal; middle: intracellular recording; bottom: respiratory signal with expiration (Expi) and inspiration (Inspi) separated by a dotted line. The inspiration/expiration transitions are represented by gray circles. The odor stimulation is indicated by a horizontal black line above the LFP signal. B) Morphological identification of mitral/tufted cells. A morphological reconstruction of a mitral/tufted cell recorded in vivo and intracellularly labeled with biocytin. Each reconstructed mitral/tufted cell was characterized by the localization of its soma in the mitral cell layer or the deep external plexiform layer, its extensive lateral dendrites and the projection of its apical dendrite into a single glomerulus. EPL: external plexiform layer; MCL: mitral cell layer; IPL: internal plexiform layer; GrL: granular layer.