Fig. 5. Spiking activity in the intestinal nerve relative to the number of mature oocytes present in the ovotestis. (A) Recordings obtained from snails with large numbers of mature oocytes had afferent spike rates substantially higher than those recorded in snails with few mature oocytes. Data points are means ± S.E.M. for five randomly selected periods of 1 min duration. Diggers were observed excavating nests within 5 days prior to the recordings. The number of deposited eggs was determined from our laboratory colony (mean = 86.9±2.7, N=104). (B) Log transformation of the data shown in A. The line is the linear regression (r²=0.812, P<0.001, N=14). (C) Log-transformed data showing the relationship between afferent spike rates and efferent spike rates (r²=0.623, P<0.001, N=14).