Appendix 7—figure 11. Comparing dark-adapted wild-type and hdc^JK910 R1-R6s’ photomechanical rhabdomere contractions to their corresponding electrophysiological responses at 19°C.

(A) Intracellular voltage responses of dark-adapted wild-type R1-R6s to a 10 ms subsaturating light pulse, delivered at the center of their receptive field. (B) Characteristic non-averaged photomechanical rhabdomere movements (displacement in time) of a typical wild-type fly, as quantified by the cross-correlation analysis (Appendix 7—figure 4) to very dim (log(−3.5)), moderate (log(−2)) and very bright (log(0)) 10 ms light flashes. (C) Intracellular responses of dark-adapted hdc^JK910 R1-R6s to a similar stimulus (as in a). (D) hdc^JK910 rhabdomere movements to very dim, moderate and very bright 10 ms flashes are characteristically slightly smaller than the corresponding wild-type recordings in (B). (E) The wild-type and (F) hdc^JK910 rhabdomere displacements increase with logarithmic light intensity. (G) Mean wild-type rhabdomere movement was larger than that of hdc^JK910 over the tested intensity range, with the hdc^JK910 photoreceptors’ apparent right-shift indicating a 10-fold reduced sensitivity. (H) This right-shift is broadly similar to these photoreceptors’ V/LogI characteristics, measured from their ERG slow components (Dau et al., 2016).