Translation versus rotation as dominant training input feature.
Every plot group visualizes a different aspect of the trained SFA units and within each plot group, nine units are shown (every third, starting from the first, up to SFA unit number 25). Columns from left to right: optimal excitatory stimuli, orientation/phase response, response in Fourier space, orientation tuning plots. Rows: A SFA units trained with pink noise images that were subject to translation only. B Units trained with a mixture of rotation and translation. C Units trained with input that contained rotation only.