Skip to main content
. Author manuscript; available in PMC: 2012 Jan 13.
Published in final edited form as: Neuron. 2011 Jan 13;69(1):147–158. doi: 10.1016/j.neuron.2010.12.007

Figure 2.

Figure 2

Relative timing of jump-escape stages in freely behaving animals. A) Timing of co-contraction onset (red), DCMD peak firing rate (black) and take-off (blue) in response to looming stimuli with l/|v|= 40, 80, and 120 ms (mean and SD; nT shown on figure). The timing of these stages was highly correlated with l/|v|, ρ=0.57, 0.69, and 0.78, respectively. Slopes (α) and intercepts (δ) of linear fits were as follows. Start of co-contraction: α=1.33 (SD: 0.37), δ=191 ms (SD: 33); DCMD peak: α=1.26 (SD: 0.22), δ=34 ms (SD: 19); Take-off: α=1.55 (SD: 0.20), δ=−69ms (SD: 18). Top inset: Representative delays between DCMD peak and co-contraction onset (red) and between peak and take-off (blue; nT = 23). Positive delays correspond to events after the peak (data points staggered vertically for clarity). B) The end of co-contraction (triggering) and take-off were highly correlated (ρ = 0.95, data pooled across l/|v| values). Linear fit slope: 0.89 (SD: 0.06); intercept: −27 ms (SD: 3.7), indicating that take-off occurs approximately 27 ms after triggering (dashed line). C) Timing of DCMD peak firing rate and take-off relative to expected collision time were highly correlated (ρ = 0.87, data pooled across l/|v| values). Linear fit slope: 0.94 (SD: 0.09); intercept: −70 ms (SD: 13), indicating that take-off occurs approximately 70 ms after the DCMD peak (dashed line). nL = 9 for DCMD and take-off data, nL = 4 for co-contraction data.