Table 1.

Settings for each stimulus configuration

Configuration No.	FG Contrast, %	Static Surround Contrast, %	Surround Spatial Phase (Relative To FG), °	Surround Orientation (Relative to FG), °	Position	Upper-Lower Temporal Phase Difference, °	Flickering Frequency, Hz
1	[0, 25, 50, 75, 100]	[0, 50, 100]	0, 180	0	Peripheral	180	25
2	[0, 25, 50, 75, 100]	[0, 50, 100]	0, 180	90	Peripheral	180	25
3	[50, 100]	[0, 100]	0, 180	0	Peripheral	0	25
4	[50, 100]	[0, 100]	0, 180	0	Foveal	n/a	25
5	[50, 100]	[0, 100]	0, 180	0	Peripheral	180	7.14
6	[50, 100]	[0, 100]	0, 180	0	Peripheral	0	7.14
7	[50, 100]	[0, 100]	0, 180	0	Foveal	n/a	7.14

A total of 100 conditions with various contrast combinations, phase alignment, and frequency/position configuration were randomly interleaved. Each of seven possible configurations had a particular position (peripheral or foveal), surround orientation, temporal phase difference, and flicker frequency (7.14 or 25 Hz). FG, foreground; n/a, not applicable.