CHEMORECEPTION: LOCOMOTION AND ORIENTATION 



313 



Elapsed time in minutes after release of stimulus at < flow 



0-5 



5-10 



10-15 



15-20 



20-25 



^# 



30-35 



60-65 



65-70 



85-90 



90-95 



-„ 



Gingtymostomo arratum response to shrimp extract in flowing woter (1.17 cms) 



Elapsed time in minutes after release of stimulus non-flow 



±L 



5-10 



10-15 



15-20 



20-25 



W> 



"/;: 





n 



30-35 



60-65 



65-70 



85-90 



90-95 



<■/ 



; 





\ 



i i 





• 



J ' >: 



Gmglymostoma cirratum response to shrimp extract in stagnant water 



Figure 30 Ginglymostoma cirratum : locomotor tracks plotted by computer, based on the 

 same data as Fig. 23 (flowing water) and Fig. 27 (stagnant water), in 5-min time series. 

 The stars indicate the position of the needle (#6) releasing the stimulus. The arrows in the 

 top series indicate the direction of flow (1.17 cm/s). From Kleerekoper et al. (1975). 



small but also because locomotor behavior is subject to great variability. 

 Frequently the changes are spread out over time and therefore can be con- 

 vincingly demonstrated only by long-term data acquisition. 



In this laboratory, the question was raised whether such subtle responses 

 to a stimulus might be detected more rapidly by determining the behavior of 

 a locomotor model over time in constant conditions, forecasting its future 

 behavior within acceptable limits of confidence, and verifying whether the 

 behavior exceeds these limits as it is subject to the experimental stimulus 

 being studied. 



