Table 1.

Receptive field parameter valuesa (mean ± SEM) for ganglion cells from controls and NPY-cell ablated retinas

Controls NPY-cell ablated p (t test)
Surround size, σs (μm)
All cells 1065 ± 77 791 ± 67 <0.05*
ON cells only 1177 ± 121 898 ± 80 <0.05*
OFF cells only 970 ± 99 554 ± 114 <0.05*
Center size, σc (μm)
All cells 104.5 ± 6.2 91.8 ± 7.1 >0.4
ON cells only 107.5 ± 7.5 95.8 ± 9.6 >0.5
OFF cells only 102.0 ± 9.6 83.1 ± 8.4 >0.2
Surround strength, Fs
All cells 4.27 ± 0.68 3.79 ± 0.71 >0.5
ON cells only 4.17 ± 1.07 3.53 ± 0.78 >0.5
OFF cells only 4.36 ± 0.89 4.35 ± 1.54 >0.5
Center strength, Fc
All cells 6.85 ± 0.62 6.33 ± 0.52 >0.5
ON cells only 7.31 ± 0.85 5.80 ± 0.59 >0.2
OFF cells only 6.46 ± 0.90 7.51 ± 1.02 >0.5
Asymmetry, q
All cells 0.24 ± 0.02 0.22 ± 0.02 >0.5
ON cells only 0.26 ± 0.03 0.23 ± 0.03 >0.5
OFF cells only 0.22 ± 0.03 0.18 ± 0.03 >0.4
Phase, φ radians
All cells 1.64 ± 0.11 1.80 ± 0.11 >0.4
ON cells only 1.66 ± 0.16 1.76 ± 0.14 >0.5
OFF cells only 1.61 ± 0.15 1.88 ± 0.19 >0.4
Number of cells 98 77
  • a See Materials and Methods for description of parameters.

  • * Statistically significant difference between control and NPY cell-ablated groups.