Figure 3

Selective block of slower-conducting CAP components in the Aplysia californica pleural-abdominal connective. (Left) Selected traces of CAP components corresponding to white lines on contour plot (right). (Trace 9) CAP before IR application. (Trace 19) CAP after IR application for 4.5 seconds. The slowest sub-populations (~0.2 m/s) are inhibited by IR light (arrow). (Trace 38) CAP after IR application for 14 seconds. Both the slowest (~0.3 m/s) and intermediate velocity populations (~0.4 m/s) are inhibited (arrows). (Trace 47) CAP after removal of IR light; all CAP components are present, indicating reversibility. (Right) Contour plot of CAP traces (electrical stimulation frequency, 2 Hz) illustrating progressive preferential block of slow components during IR application (red vertical bar; on, trace 11; off, trace 47). Conduction velocity (m/s) is plotted against trace number. A color bar denotes trace voltages. For analysis of data, see Figure S4.