The illusion of transparency and chromatic subjective contours

Subjective contours can be produced that include an illusion of edge and an extension of color throughout the area of the illusion. The phenomenological appearance is of a transparent colored shape in front of the background. Two explanations of this illusion are proposed. The first is that there is an assimilation of color analogous to brightness assimilation. The second is a variant of the stratification of depth theory of subjective contours. In it, the pattern elements lead to the illusion of a surface in front of the pattern elements. We thus predicted that an illusion of transparency would enhance the subjective contour, Metelli’s model of transparency was used to quantify our prediction, and it was found that the possibility of transparency was a powerful predictor of the chromatic subjective contour.     

Decision difficulty and illusion of transparency in Japanese university students

People tend to believe that their inner thoughts are readily apparent to others. This study was conducted to examine effects, related to the difficulty of making decisions of personal preference, on the illusion of transparency, that is, the tendency people have to regard their own preference as more apparent to others when they have made their decision easily as opposed to situations in which they felt their decision to be difficult. In three studies in which the customary "transparency" experimental paradigm was used, university students were asked to rank choices of wedding dresses (Studies 1 and 3) or Korean movie stars (Study 2). Analysis suggested that the less difficulty participants felt in making their judgments (the first and last preference vs mid-ranking preference), the more they expected judgments to be transparent, especially when they had the clear intent to convey their thoughts to others. However, observers discerned first preferences no better than mid-ranking preferences. How inner subjective information contributes to the illusion of transparency is also discussed.     

Misattribution and speech anxiety

It has been reported that misattribution can enhance the social behavior of shy subjects. By extrapolation, misattribution should also calm speech-anxious subjects and improve their speechmaking. We therefore crosscut misattribution versus control and high versus low speech anxiety, and assessed the impact on nervous behavior and speechmaking. Misattribution did not significantly affect most of the behavior of subjects making speeches. We discuss the implications of these findings for misattribution when personality traits are involved.     

Misattribution, preparatory information, and speech anxiety

In two experiments with undergraduate subjects, I compared the effects of misattribution versus information manipulations on speech anxiety. In Experiment 1, some subjects were allegedly exposed to subliminal noise while reading a speech in front of a camera. These subjects were told that subliminal noise makes people feel either unpleasantly aroused or pleasantly relaxed or that it has no effect. Subjects in a fourth condition were given accurate information about how they would feel (unpleasantly aroused) but were not exposed to the subliminal noise misattribution source. In Experiment 2, I replicated the arousing noise and accurate information conditions from the first study and added two new groups incorporating a delay that should preclude misattribution. In both experiments, the alleged presence of arousing subliminal noise reduced subjects' speech dysfluencies during the speech task, whereas the presentation of accurate information alone did not have a comparable ameliorative effect. Thus, both experiments supported the misattribution interpretation of why neutral labels for arousal can reduce emotionality.     

Attention bias modification for reducing speech anxiety

The mechanisms mediating the anxiolytic effects of attention bias modification (ABM) remain unclear. Accordingly, we randomly assigned speech-anxious subjects to receive four sessions of one of three training conditions: ABM, inverse ABM, and control. In the ABM condition, subjects viewed pairs of photographs of models displaying facial expressions of disgust and joy on a computer screen. Probes always replaced the positive face, and subjects pushed a button to indicate the identity of the probe (E or F) as rapidly as possible. In the inverse condition, the probes always replaced the negative face, and in the control condition, the probes replaced each face type equally often. After four training sessions, all groups exhibited statistically indistinguishable, but significant, reductions on self-report, behavioral, and physiological measures of speech anxiety. Self-report and behavioral measures of attentional control improved likewise. Contrary to early studies, ABM was not superior to control procedures in producing reductions on measures of social anxiety.     

The solitaire illusion: An illusion of numerosity

A new illusion in which the apparent number of elements of two kinds is determined by their spatial arrangement is described. The illusion is such that one large cluster appears to contain more elements than several small clusters, clustering being determined by Gestalt principles. The illusion was found both in adults and in children of 8 years.     

Graduated exposure plus feedback in the treatment of speech anxiety

This study investigated the effectiveness of a graduated exposure procedure, combined with peer feedback, in the treatment of speech anxiety. Subjects were assigned to one of two conditions: (a) graduated exposure/shaping plus feedback or (b) no-treatment control. Results indicated that the graduated exposure/shaping plus feedback treatment group demonstrated significantly greater speech anxiety reduction than the no-treatment control group at post- and follow-up assessment.     

Caffeine ingestion,misattribution therapy,and speech anxiety

While theoretical analogs of misattribution therapy appeared promising (Nisbett & Schachter, 1966; Ross, Rodin, & Zimbardo, 1969), attempts with clinically relevant behaviors have not been so successful (Kellogg & Baron, 1975; Singerman, Borkovec, & Baron, 1976). Since the plausibility of the misattribution manipulation appears to be the central problem, the present study attempted to increase plausibility by manipulating familiarity with the setting and actual psychological arousal in a clinically relevant situation. Subjects only slightly fearful of giving speeches presented a speech in front of two observers. Familiarity was varied by having half of the subjects give a pretest speech, while arousal was manipulated by having half of the subjects ingest caffeine while the others ingested a placebo just prior to the test speech. The subjects' attributions were varied by giving them either arousal or irrelevant symptom instructions regarding the effects of the ingested drug. Direct suggestion rather than misattribution effects occurred: Those subjects receiving arousal symptoms reported more nervousness than subjects who had received irrelevant symptoms. The authors conclude that while the misattribution effect may have experimental validity, it is not effective with clinically relevant behavior.     

The basis of the Bourdon illusion

Day (1990) and Day, Mitchell, and Stecher (1990) recently reported new data on the Bourdon illusion, showing that the effect occurs in novel variations of the classic figure--for example, with orthogonal and parallel test edges--and also that it occurs in the haptic modality. Day (1990) criticized theories of the Bourdon effect proposed by Wenderoth, Criss, and van der Zwan (1990), Wenderoth and O'Connor (1987a, 1987b), and Wenderoth, O'Connor, and Johnson (1986), and proposed his own "perceptual compromise" hypothesis. It is argued that Day has inaccurately portrayed the Wenderoth et al. theory, and that his own hypothesis lacks predictive power because it lacks any reference to neural mechanisms. Day's theory is thus unable to account for extant data, including his own. It is demonstrated how Day's novel experiments provide insights into the mechanisms of the Bourdon effect, and also how the Wenderoth et al. theory can account for the new data of Day (1990) and Day et al. (1990).     

The corridor illusion

Contrary to general belief, the classical corridor illusion is not due solely to the perspective and contextual cues provided by the corridor. Additional factors that are equally important are the inherent spatial anisotropies of the visual system and fixation tendencies.     

The boogie-woogie illusion

A grid of vertical and horizontal lines, each composed of light and dark squares, is moved rigidly at 45 degrees to the vertical on a gray surround. When the luminance of the background is set midway between the luminances of the light and dark squares, the squares appear to race along the lines even though they are actually 'painted' on the lines. The effect arises from the unequal apparent speeds of the lines and their textures. The light and dark squares along the lines define a first-order pattern whose apparent speed, parallel or along the line, is close to veridical. The lines themselves have no overall luminance difference from the background so that they are defined by a second-order difference. As reported elsewhere, apparent speed is reduced for second-order motion so that the motion perpendicular to the line is perceived as slower than the motion along the line even though they are physically equal. The imbalance creates the impression that the small squares are moving along the lines rather than moving rigidly with them.     

Attention allocation in social anxiety during a speech

Cognitive models assume that social anxiety is associated with and maintained by biased information processing, leading to change in attention allocation, which can be measured by examining eye movement. However, little is known about the distribution of attention among positive, neutral and negative stimuli during a social task and the relative importance of positive versus negative biases in social anxiety. In this study, eye movement, subjective state anxiety and psychophysiology of individuals with high trait social anxiety (HSA) and low trait social anxiety (LSA) were measured during a speech task with a pre-recorded audience. The HSA group showed longer total fixation on negative stimuli and shorter total fixation on positive stimuli compared to the LSA group. We observed that the LSA group shifted attention away from negative stimuli, whereas the HSA group showed no differential attention allocation. The total duration of fixation on negative stimuli predicted subjective anxiety ratings. These results point to a negative bias as well as a lack of a positive bias in HSA individuals during social threat.