square_144phase

stimupy.papers.white1985.square_144phase(ppd=PPD)

A square-wave grating with four squares that are 144 deg out-of-phase as shown in White & White (1985), Fig. 3 Stimulus size: 3.5 x 3.5 deg Target bars: 0.14 x 0.14 deg (originally 0.15 x 0.15 deg) Grating frequency: 3.5 cpd

Parameters:

ppd (int) – Resolution of stimulus in pixels per degree.

Returns:

dict with the stimulus (key: “img”) and target mask (key: “target_mask”) and additional keys containing stimulus parameters

Return type:

dict of str

References

White, M. & White, T. (1985).

Counterphase lightness induction. Vision Research, 25 (9), 1331-1335. https://doi.org/10.1016/0042-6989(85)90049-5