. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A cm B 25 cm — E C cm W^WNA^Vv D 50 cm TIME (») 10 S0 30 TIME (») Figure 2. Typical turbulence spectra of salt concentrations in the plume. Random 30 s segments from minute recordings, one at each site. A-D: Distances from the pipette mouth to the plane of the elec- trodes. The plume changes its turbulent character rather abruptly be- tween 25 and cm. It is not until 50 cm from the source that the larger scale turbulence causes sufficient meander to result in periods of zero signal. all previous sa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A cm B 25 cm — E C cm W^WNA^Vv D 50 cm TIME (») 10 S0 30 TIME (») Figure 2. Typical turbulence spectra of salt concentrations in the plume. Random 30 s segments from minute recordings, one at each site. A-D: Distances from the pipette mouth to the plane of the elec- trodes. The plume changes its turbulent character rather abruptly be- tween 25 and cm. It is not until 50 cm from the source that the larger scale turbulence causes sufficient meander to result in periods of zero signal. all previous samples contribute to the current adaptation state of the receptor cell—even those that did not result in output from the cell (, Fig. 3, subthreshold sample bar at t = -2, etc.). In addition, for the sake of simplicity, we used the unmodified input data as the basis for each new point. (In doing so we did not take into account pos- sible interactive effects that may exist between samples, , strong pulses early in the period T reduce the stimu- lating effectiveness of pulses later in the period T due to biochemical adaptation of the cell; if adaptation is a re- sult of excitation, these strong pulses may then reduce the effectiveness of later pulses in suppressing the re- sponse at t = 0). Wt was used as the weight factor in a "historical" weighted mean (A) in equation 2: A = S(C, X Wt)/SW, (2) where A is the adaptation state of the receptor at time t, and C, is the stimulus concentration at time t. The weight portion (W,/2Wt) of equation 2 is visualized in Figure 3 (dotted curve). This curve reflects the amount of adapta- tion (= threshold increase) that the 40 sample bins prior receptor cell is measured as its response threshold and is dependent on past concentrations sampled. We assumed that receptor cells self-adapt within seconds (see Borroni and Atema, 1987, and in prep.) and for this model we use instantaneous and complete adaptation immediately fol
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
