Figure 6.
Top (bottom) panel shows l values (s values) of color shifts for all angles of modulation at 6.25 Hz (open circles) and 18.75 Hz (black squares). Error bars indicate ±1 SEM. Dashed lines indicate the l or s value for the metamer to equal-energy-spectrum (EES) “white”. Gray horizontal lines show measurements from the control condition with a steady surround metameric to EES. The horizontal axis shows the angle of surround modulation (angles tested were 0°, 26°, 45°, 63°, 90°, 116°, 135°, and 153°; see Figure 2b).