The double-anchoring theory of lightness perception: a comment on Bressan (2006)

Recently, a double-anchoring theory (DAT) of lightness perception was proposed (P. Bressan, 2006), which offers explanations for all the data explained by the original anchoring theory (A. Gilchrist et al., 1999), as well as a number of additional lightness phenomena. Consequently, DAT can account for an unprecedented range of empirical results, potentially explaining everything from the basic simultaneous contrast display to subtle variations of the Gelb effect. In this comment, the authors raised 4 concerns that demonstrate serious theoretical and empirical difficulties for DAT.     

Measuring the depth induced by an opposite-luminance (but not anticorrelated) stereogram

The same-sign hypothesis suggests that only those edges in the two retinal images whose luminance gradients have the same sign, known as same-sign edges, can be stereoscopically fused to generate a perception of depth. If true, one would expect that the magnitude of the depth induced by an opposite-luminance stereogram (eg one where the figure in one stereo half-image is black and the figure in the other is white) should be determined by the disparity of the same-sign edges. Despite the considerable work on the same-sign hypothesis this prediction has yet to be verified. Here we confirm this prediction for a particular opposite-luminance stereogram and discuss possible reasons why it is not true for opposite-luminance stereograms that are presented briefly or where each stereo half-image contains many elements.     

Testing the coplanar ratio hypothesis of lightness perception

What determines an object's lightness remains unclear, but it is generally thought that the ratios of its luminance to the luminance of other objects in a scene play a crucial role because these ratios allow the relative reflectance of each object to be estimated, providing all the objects are under the same illumination. Because objects that lie in the same plane are typically illuminated equally, it has been suggested that it is the luminance ratios between coplanar objects that primarily determine lightness (Gilchrist, 1977 Science 195 185-187; Gilchrist et al, 1999 Psychological Review 106 795-834). An alternative hypothesis is that perceived illumination differences can affect lightness directly. As the studies that provided evidence for the coplanar ratio hypothesis always varied the illumination and the coplanar relationships simultaneously, it is unclear which hypothesis is correct. I measured the influence of each factor separately and found that the perceived illumination differences have a greater effect on lightness.     

An examination of interrater reliability for scoring the Rorschach Comprehensive System in eight data sets

In this article, we describe interrater reliability for the Comprehensive System (CS; Exner. 1993) in 8 relatively large samples, including (a) students, (b) experienced re- searchers, (c) clinicians, (d) clinicians and then researchers, (e) a composite clinical sample (i.e., a to d), and 3 samples in which randomly generated erroneous scores were substituted for (f) 10%, (g) 20%, or (h) 30% of the original responses. Across samples, 133 to 143 statistically stable CS scores had excellent reliability, with median intraclass correlations of.85, .96, .97, .95, .93, .95, .89, and .82, respectively. We also demonstrate reliability findings from this study closely match the results derived from a synthesis of prior research, CS summary scores are more reliable than scores assigned to individual responses, small samples are more likely to generate unstable and lower reliability estimates, and Meyer's (1997a) procedures for estimating response segment reliability were accurate. The CS can be scored reliably, but because scoring is the result of coder skills clinicians must conscientiously monitor their accuracy.     

The Mind's Multiplicity and Continuity

The article opens with a fairly detailed overview of the research on nonlinear dynamic systems, deterministic chaos, and complexity theory—referred to collectively as complexity theory. The second part of the article is aimed at applying this research to an interesting discussion that has developed in the psychoanalytic literature regarding the fundamental nature of the self as either singular or multiple. Chaotic systems (a class of nonlinear systems) exhibit staggering variability, sensitivity, and adaptation in response to perturbation (in the form of sensitive dependence on initial conditions), while also demonstrating an enduring and distinctive coherence and continuity in their overall organization (in the form of strange attractors). As such, chaotic systems are useful in conceptualizing how relatively healthy people remain recognizable (or in character) in the midst of their variability, multiplicity, and change. By contrast, pathology of the self from the perspective of nonlinear dynamic systems is characterized by the repetitive, periodic and self-same quality of mental states.     

The contributions of interpersonal attachment and friendship group identification to depressive symptoms in a nonclinical sample

Drawing on previous literature from the separate areas of adult attachment and group processes, we explored attachment and group identification as predictors for depressive symptoms in a nonclinical sample. We found that attachment anxiety and friendship group identification predicted scores on the Beck Depression Inventory, such that higher attachment anxiety resulted in higher depressive symptoms, and greater friendship group identification resulted in lower depressive symptoms. Mediational analysis suggested that group identification partially mediated the effect of attachment avoidance on depressive symptoms, but did not mediate the effect of attachment anxiety on depressive symptoms.     

Age discrimination in the workplace: identifying as a late‐career worker and its relationship with engagement and intended retirement age

Through a model of moderated indirect effects, this study examined the relationship between perceived age discrimination, cognitive and affective identification as a late‐career worker, intended retirement age, and work engagement. Bootstrap analysis confirmed that a negative relationship between perceived age discrimination and work engagement was strongest when cognitive identification was high and affective identification was low, and nonsignificant when affective identification was high. In contrast to previous research, no overall association between age discrimination and intended retirement age was found. Rather, post hoc analyses showed that work engagement suppressed a positive direct relationship between age discrimination and intended retirement age.