Figure 3.

Dependence of the shift of serial dependence on the magnitude of the surround illusion

(A) Neutral trials preceded by illusory trials. For each participant (N = 19), we plot the center of the curve describing serial effects (the locus of maximal effect) as function of the average illusory bias for that participant. Star symbols show results of the aggregate observer. Light green symbols show results when the previous flanker orientation was +15° (CCW), dark green −15° (CW). The thick green line shows the best linear regression along with confidence bands. Black and pink dashed lines represent the predictions if the serial dependence were based on physical or perceived orientation, respectively.

(B) Same as in (A) but for conditions where an illusory trial succeeds a neutral trial. Blue and navy-blue symbols refer to previous flanker orientations of +15° or −15°, respectively. The thick blue line shows the best linear regression.