The Münsterberg figure and twisted cords

Morgan, Michael J.; Moulden, Bernard

doi:10.1016/0042-6989(86)90130-6

Cited by 66 publications

(82 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This demonstration is clearly closely related to the Fraser 'twisted cord' illusion (Fraser 1908;Morgan and Moulden 1986). Indeed, a proposed explanation for the Fraser effect is in terms of 'collector units' which receive inputs from similarly oriented receptive fields lying along a path roughly consistent with their preferred orientation/ position (Morgan and Moulden 1986).…”

Section: A Second-order' Mechanism?mentioning

confidence: 88%

See 1 more Smart Citation

Glass Patterns: Some Contrast Effects Re-Evaluated

Dakin

1997

Perception

View full text Add to dashboard Cite

Abstract. The relative contrast of features is known to be important in determining if they can be grouped. Two manipulations of feature contrast have previously been used to criticise models of visual grouping based on spatial filtering: high-pass filtering and reversal of contrast polarity. The effects of these manipulations are considered in the context of the perception of Glass patterns. It is shown that high-pass filtering elements, whilst destroying structure in the output of low-pass filters, do not significantly disrupt the output of locally band-pass filters. The finding that subjects can perceive structure in Glass patterns composed of high-pass features therefore offers no evidence against such spatial filtering mechanisms. Band-pass filtering models are shown to explain the rotation of perceived structure in Glass patterns composed of opposite contrast features. However, structure is correctly perceived in patterns composed of two 'interleaved' opposite contrast patterns, which is problematic for oriented filtering mechanisms. Two possible explanations are considered: nonlinear contrast transduction prior to filtering, and integration of local orientation estimates from first-order and second-order mechanisms.

show abstract

Section: A Second-order' Mechanism?mentioning

confidence: 88%

“…Indeed, a proposed explanation for the Fraser effect is in terms of 'collector units' which receive inputs from similarly oriented receptive fields lying along a path roughly consistent with their preferred orientation/ position (Morgan and Moulden 1986). This is effectively a second-order orientation mechanism.…”

Section: A Second-order' Mechanism?mentioning

confidence: 99%

Glass Patterns: Some Contrast Effects Re-Evaluated

Dakin

1997

Perception

View full text Add to dashboard Cite

show abstract

“…Since the café wall illusion is an orientation-specific phenomenon, it seems reasonable to explain it upon the basis of an orientationencoding mechanism in the visual system. In fact, several d studies have suggested that the café wall illusion is induced by outputs from a mechanism that selectively responds to specific orientations in the image (Haig, 1989;Lulich & Stevens, 1989;Morgan & Moulden, 1986).…”

mentioning

confidence: 99%

“…When the café wall figure is convolved with a difference of Gaussians (DoG) operator, a twisted cord (Fraser, 1908) of alternating light and dark diagonal bands appears (Earle & Maskell, 1993;Lulich & Stevens, 1989;Morgan & Moulden, 1986). This twisted cord has been thought to d be the basis of the café wall illusion, since locally tilted segments of twisted cords elicit a global impression of orientation (Morgan & Moulden, 1986;Tyler & Nakayama, 1984).…”

mentioning

confidence: 99%

“…This twisted cord has been thought to d be the basis of the café wall illusion, since locally tilted segments of twisted cords elicit a global impression of orientation (Morgan & Moulden, 1986;Tyler & Nakayama, 1984). Lulich and Stevens suggested that these locally tilted segments are detected by a bank of spatially oriented filters in the striate cortex and that this induces the r impression of orientation on the physically parallel mortar lines in the café wall figure (see also Morgan & Moulden, 1986). py g y y, 1113…”

mentioning

confidence: 99%

See 1 more Smart Citation