25- 



20 - 





10 - 



5 W 15 20 



Time (seconds) 



Fig. 8.33. Responses of a Single Lorenzinian Ampulla to 

 Temperature Changes of < 0-5°C (Raja) 



Spike frequency recorded from branch of hyomandibular nerve, plotted against time. 

 The vertical line, at 4 sec, marks onset of temperature change. Initial and final tempera- 

 tures are marked on either side of this line ; final temperature is attained at a point 3-5 

 sec to the right of the line. (From Sand (128).) 



Fig. 8.34. Action Potentials Recorded from a Branch of the Hyomandi- 

 bular Nerve of Raja, Showing Effects of Cooling and Warming an 



Ampulla of Lorenzini 

 The white line below base line marks change in temperature: upward displacement, 

 cooling; downward displacement, warming. Time signal in seconds. (From Sand (128).) 



