. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MECHANO- AND OSMORECEPTORS IN P. ARGUS 203 Direction of bending. DDistal • Proximal • Lateral D Medial. Figure 8. Six of ten tested bend neurons were directionally sensitive, responding with more spikes when bent in one direction than in others. The given direction of bending is relative to the long axis of the appendage. None of the six neurons responded exclusively to one direction of bending, but in general they showed a "best" direction. Neuron 6 was different in that it seemed to display a "worst" di
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. MECHANO- AND OSMORECEPTORS IN P. ARGUS 203 Direction of bending. DDistal • Proximal • Lateral D Medial. Figure 8. Six of ten tested bend neurons were directionally sensitive, responding with more spikes when bent in one direction than in others. The given direction of bending is relative to the long axis of the appendage. None of the six neurons responded exclusively to one direction of bending, but in general they showed a "best" direction. Neuron 6 was different in that it seemed to display a "worst" direction. No error bars are given since n = \ for all recordings. manipulation (Fig. 2), and this should activate the bend- sensitive neurons. As seen in video recordings, the distal part of the seta is most likely to bend during food manipu- lation, consistent with the fact that most bend neurons are only sensitive to bending distally (Fig. 9). Decapods in general have mandibles with separate areas for biting or crushing the prey (incisor and molar processes, respec- tively) (Lavalli and Factor. 1W2; Garm and H0eg, 2001). Bend sensitivity, perhaps in coordination with propriocep- tors, may provide animals with information on the hardness of the prey, affecting the decision about whether to crush or bite the prey item with the mandibles. The phaso-tonic response of bend neurons should ensure that the animals get information on the position of the object even when the prey is not moving or being moved. The directionality and region of sensitivity of bend neurons should give information on shape, texture, and location of the prey item, in addition to the stimulus direction and velocity information provided by displacement neurons (discussed below). An interesting question is how the directional sensitivity of the bend neurons is enabled. It could be due either to the mechanical properties of the setal cuticle making bending more likely in one or more directions, or to the morp
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