p073fig02.20 Shunting saturation occurs when inputs get larger to non-interacting cells.<BR>||  Shunting saturation. [xi(t), B - xi(t)].<TABLE border="1"><TR><TD></td><TD>(a)</td><TD>(b)</td></tr><TR><TD>d[dt: xi] = </td><TD>-A*xi </td><TD>+ (B - xi)*Ii</td></tr></table>(a) Spontaneous decay of activity xi to equilibrium<BR>(b) Turn on unexcited sites B - xo by inputs Ii (mass action)<BR>Inadequate response to a SPATIAL PATTERN of inputs: Ii(t) = θi*I(t)<TABLE border="1"><TR><TD>θi</td><TD>relative intensity (cf. reflectance)</td></tr><TR><TD>I(t)</td><TD>total intensity (cf. luminance)</td></tr></table>