Different response properties of ON- and OFF-centre cells.

<p>A) ON-centre cells show significantly higher mean contrast gain than OFF-centre cells (<i>t</i>-test, <i>P</i><0.01). ON-centre cells: 1.10 ± 0.05 spikes/sec; OFF-centre cells: 0.87 ± 0.06 spikes/sec. B) ON-centre cells show significantly lower mean C₅₀ values than OFF-centre cells (<i>t</i>-test, <i>P</i><0.05). ON-centre cells: 0.47 ± 0.03; OFF-centre cells: 0.56 ± 0.03. C) ON-centre cells show significantly lower mean preferred temporal frequencies than OFF-centre cells (<i>t</i>-test, <i>P</i><0.01). ON-centre cells: 3.1 ± 0.1 Hz; OFF-centre cells: 3.6 ± 0.2 Hz. D) ON-centre cells have significantly lower mean temporal frequency bandwidths than OFF-centre cells (<i>t</i>-test, <i>P</i><0.001). ON-centre cells: 4.9 ± 0.3 Hz; OFF-centre cells: 6.5 ± 0.3 Hz. E) Mean temporal frequency high₅₀ values are comparable between ON- and OFF-centre cells (<i>t</i>-test, <i>P</i>>0.1). ON-centre cells: 7.2 ± 0.4 Hz; OFF-centre cells: 7.6 ± 0.3 Hz. F) ON-centre cells have significantly higher mean temporal frequency low₅₀ values than OFF-centre cells (<i>t</i>-test, <i>P</i><0.01). ON-centre cells: 1.0 ± 0.1 Hz; OFF-centre cells: 0.6 ± 0.1 Hz. The value for each single ON- or OFF-centre cell is presented as a triangle or a square respectively. The horizontal dark line represents the mean value and the vertical error bar represents ± SEM in each plot.