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. 2010 Aug 11;30(32):10667–10682. doi: 10.1523/JNEUROSCI.1387-10.2010

Figure 2.

Figure 2.

Electrical stimulation evoked two-component optical responses. A, Schematic diagram of a coronal SC slice (cortex removed). Gray triangles show four sites of stimulation within SC laminae. Open triangles represent the sites from which voltage imaging traces were recorded and are displayed in C and D. B, CCD image of the SC diagramed in A. i–iv, Stimulation sites. The layers of the SC are labeled and demarked with white lines. USGI, Upper SGI; LSGI, lower SGI. Circles labeled C and D indicate the sites from which voltage traces were recorded and are displayed in C and D. C, Voltage imaging traces from the SGS (circle C in B) following stimulation at each of the four sites. Traces show 100 ms before and 400 ms following electrical stimulation (applied at time 0). Initial- spike (0–10 ms) and after-depolarization (20–160 ms) components are shaded in gray. D, Voltage imaging traces from the SGI (circle D in B). Arrangement is the same as in C. Scale bars, ΔI/I = 0.5 × 10−3. E, Comparison of voltage imaging (VI) traces (ΔI/I) and LFP recordings (mV) from the SGS following both SGS stimulation and SGI stimulation. Scale bars: ΔI/I = 0.2 × 10−3, 0.2 mV, respectively.