Table 1.

Linear regression fit statistics between the fly's turning velocity and the left-minus-right eye output of the rotation- and expansion-sensitive elementary motion detector system, respectively

Arena velocity (° s–1)EMD systemSlope × 10–3y-interceptR2PN
0Rotation–2.51±2.710.02±1.020.12±0.120.13±0.23 (NS)22
100Rotation–4.00±0.420.77±0.190.23±0.090.003±0.009**23
300Rotation–4.63±1.161.50±0.430.36±0.110.004±0.01**20
500Rotation–5.40±1.022.57±0.440.47±0.11<0.0001***20
700Rotation–4.38±0.722.68±0.450.34±0.120.03±0.14*21
900Rotation–1.76±2.261.60±1.060.06±0.050.22±0.23 (NS)26
0Expansion–0.21±1.080.10±0.330.07±0.100.34±0.29 (NS)22
100Expansion–0.50±1.100.20±0.370.04±0.040.26±0.32 (NS)23
300Expansion0.64±1.42–0.25±0.580.10±0.120.15±0.23 (NS)20
500Expansion1.05±1.85–0.51±0.940.06±0.070.18±0.29 (NS)20
700Expansion0.60±1.90–0.33±0.990.03±0.040.29±0.34 (NS)21
900Expansion–0.33±1.590.18±0.700.04±0.040.35±0.32 (NS)26
  • We performed model I regression fit on a data subset ranging from 0 to 900° s–1 turning velocity. *0.05, **0.01 and ***0.001 significance level of slope. NS, not significant. N, number of flies. Data are means ± s.d.