TY - JOUR
T1 - Evidence for a significant contribution of interactions between oriented line segments in the Tolansky version of the Poggendorff illusion
AU - Wenderoth, Peter
AU - O'Connor, Tony
AU - Johnson, Michael
PY - 1986/9
Y1 - 1986/9
N2 - Interactions between line segments, including angle distortion, commonly are proposed as partial determinants of the Poggendorff illusion. Day and Kasperczyk (1985) found that replacing all transverse line segments with dots had no effect on alignment errors, thus rendering untenable explanations couched solely or largely in terms of line interactions. The illusions they obtained, using Tolansky variants of the basic illusion, were attributed to judgments that compromised between vertical and oblique bisection. In the present experiment, subjects were instructed to avoid such a compromise: Preliminary experiments had suggested that compromise judgments were more likely to affect displays with dot pointers than those with line pointers. It was found that the addition of parallel inducing lines significantly increased illusions, but only when transverse pointers were line segments rather than dots. This was consistent with previous research, which has shown that line interactions are a significant component of Poggendorff effects.
AB - Interactions between line segments, including angle distortion, commonly are proposed as partial determinants of the Poggendorff illusion. Day and Kasperczyk (1985) found that replacing all transverse line segments with dots had no effect on alignment errors, thus rendering untenable explanations couched solely or largely in terms of line interactions. The illusions they obtained, using Tolansky variants of the basic illusion, were attributed to judgments that compromised between vertical and oblique bisection. In the present experiment, subjects were instructed to avoid such a compromise: Preliminary experiments had suggested that compromise judgments were more likely to affect displays with dot pointers than those with line pointers. It was found that the addition of parallel inducing lines significantly increased illusions, but only when transverse pointers were line segments rather than dots. This was consistent with previous research, which has shown that line interactions are a significant component of Poggendorff effects.
UR - http://www.scopus.com/inward/record.url?scp=0022712816&partnerID=8YFLogxK
U2 - 10.3758/BF03203000
DO - 10.3758/BF03203000
M3 - Article
C2 - 3737364
AN - SCOPUS:0022712816
VL - 39
SP - 334
EP - 338
JO - Attention, Perception and Psychophysics
JF - Attention, Perception and Psychophysics
SN - 1943-393X
IS - 5
ER -