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PubMed1999

Deconstructing Marilyn: robust effects of face contexts on stimulus-response compatibility.

Hommel and Lippa (1995) found a left-right spatial compatibility effect with respect to a background context of Marilyn Monroe's face, rotated 90 degrees clockwise or counterclockwise from upright, when subjects responded to up or down stimuli by pressing a left or a right key. They interpreted their results as providing evidence for object-based coding of stimulus location. We conducted four experiments in order to evaluate the reliability of this face context effect, to control for possible artifacts and evaluate alternative explanations, and to establish generalizability to other face contexts. This was accomplished by using not only the original photograph, but also a mirror-reversed image, chimeric faces composed from the left or the right sides of the original photograph, an outline drawing face, and a circle with markings for facial features. Our results were much stronger than those of Hommel and Lippa, and the face context effect was found for all of the face variations. Our experiments also provided evidence to suggest that asymmetric coding of the up and down locations contributes to performance in the face context as well.

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PubMed1993

A quantitative analysis of illusion magnitude predicted by several averaging theories of the Müller-Lyer illusion.

This article describes a quantitative method to evaluate several averaging (i.e., confusion and assimilation) theories by comparing predictions of the absolute magnitude of the Müller-Lyer (ML) illusion with results of previous studies of the composite ML figure. The magnitude of illusion was best predicted by Davies and Spencer's (1977) theory and by integrative field theory (Pressey & Pressey, 1992). Furthermore, when the ML figure was at the point of subject equality, the average of shaft and intertip distances, and the configural dimensions proposed by Davies and Spencer, were most frequently closest to being equal in the apex-in ML and apex-out ML. Results indicate that a comparison of predicted and reported absolute magnitudes of the ML illusion can provide quantitative criteria to distinguish and evaluate averaging theories of the ML illusion.

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PubMed1998

The mean-integral representation of rectangles.

To assess perceptual interaction between the height and width of rectangles, we used an accuracy variant of the Garner paradigm. We measured the discriminability of height and width (baseline tasks) and size and shape (correlated tasks). From the d' values in these conditions, we estimated perceptual distances and inferred a mean-integral representation in which height and width corresponded to non-independent dimensions in a perceptual space. This model accounted well for performance in these two-stimulus conditions, and it also explained 70%-80% of the decline in performance in selective and divided attention. In a second experiment, conducted for purposes of comparison with the rectangle discrimination Experiment, we studied the discrimination of horizontal and vertical line segments connected in an L-shape. In size discrimination, observers were equally good with line pairs and rectangles, suggesting holistic perception; but in shape discrimination, they appeared to combine information from the two line-pair components of the rectangle independently. The mean-integral model was again successful in relating performance in the Garner tasks quantitatively.

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PubMed1991

The effect of lightness contrast on the colored Müller-Lyer illusion.

Two subjects estimated the length of the central line in red and blue Müller-Lyer figures that were viewed both foveally and parafoveally. The illusion figures were defined by either lightness and hue differences between figure and ground or by a hue difference alone. For both subjects, the figures defined solely by hue produced larger illusions. Since depth-cue scaling and other cognitive factors did not cause the enlargement, it was concluded that the robust, hue-produced illusions resulted from contour interactions generated within parvocellular channels that are specialized for coding color.

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PubMed1996

Touch dominates haptic estimates of discordant visual-haptic size.

Observers (72 college students) estimated the size of plastic squares that they held in their fingers and simultaneously viewed through a reducing lens that halved the squares' visual size. The squares were grasped from below through a cloth that prevented direct sight of the hand. Each estimate was a match selected later, either haptically or visually, from a set of comparison squares. Vision dominated the visual estimates and touch dominated the haptic estimates, whether or not the observers knew in advance which type of estimate they would be asked to make. Neither modality inherently dominates perceived size.

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