CHEMORECEPTION: LOCOMOTION AND ORIENTATION 



A Tel 



283 



N. opt. 



Tr. olf 



Figure 12 (A) Torpedo ocellata and (B) Gingly- 

 mostoma cirratum telencephons. Shaded areas are 

 projection areas of the lateral olfactory tract in the 

 lateral olfactory region of the telencephalon. Lateral 

 views. From Bruckmoser (1972). 



described (Schroeder and Ebbesson 1971, 1974). Both electrophysiological 

 (Cohen et al. 1973; Veselkin and Kovacevic 1973) and behavioral (Graeber 

 and Ebbesson 1972; Graeber et al. 1973) evidence has been presented for 

 visual functions of the telencephalon, independent of the optic tectum. 



Observations on evoked potentials in primary and secondary olfactory 

 projection areas in elasmobranchs by Bruckmoser and Dieringer (1973) con- 

 firmed that the secondary olfactory area is much more restricted than pre- 

 viously believed. Electrical stimulation of the olfactory epithelium and the 

 bulb in Scyliorhinus evokes secondary olfactory potentials in the forebrain 

 with conduction velocities of 1 to 2 m/s in the fibers of the olfactory tract. 



Gilbert et al. (1964) described EEG patterns of the olfactory lobe as- 

 sociated with olfactory stimuli in unanesthetized lemon sharks (Negaprion 



