“Extinction” of the McCollough effect does not transfer interocularly

A McCollough effect was induced in subjects by having them view typical adapting stimuli binocularly for 5 min. In the control condition, the strength of the McCollough effect was measured 20 min after the end of the adaptation. The strength was measured during monocular and binocular viewing of a test pattern via a color cancellation technique. Monocular strengths for the two eyes of a given subject were equal to each other and slightly weaker than the binocular strength. In the test condition, 15 min of the 20 min between adaptation and testing were spent monocularly viewing black and white gratings of the same orientation and spatial frequency as the adapting gratings. The strength of the effect as measured ipsilaterally was markedly decreased from that in the control condition. The strength of the effect as measured with the contralateral eye showed only a small decrease from that of the control condition. This finding is relevant to various models of the McCollough effect and related color aftereffects, especially those that posit a “learning” type of mechanism between achromatic spatial channels (which exhibit clear interocular transfer of various achromatic effects) and monocular color channels.     

Monocular discs in the occlusion zones of binocular surfaces do not have quantitative depth--a comparison with Panum's limiting case

Da Vinci stereopsis is defined as apparent depth seen in a monocular object laterally adjacent to a binocular surface in a position consistent with its occlusion by the other eye. It is widely regarded as a new form of quantitative stereopsis because the depth seen is quantitatively related to the lateral separation of the monocular element and the binocular surface (Nakayama and Shimojo 1990 Vision Research 30 1811-1825). This can be predicted on the basis that the more separated the monocular element is from the surface the greater its minimum depth behind the surface would have to be to account for its monocular occlusion. Supporting evidence, however, has used narrow bars as the monocular elements, raising the possibility that quantitative depth as a function of separation could be attributable to Panum's limiting case (double fusion) rather than to a new form of stereopsis. We compared the depth performance of monocular objects fusible with the edge of the surface in the contralateral eye (lines) and non-fusible objects (disks) and found that, although the fusible objects showed highly quantitative depth, the disks did not, appearing behind the surface to the same degree at all separations from it. These findings indicate that, although there is a crude sense of depth for discrete monocular objects placed in a valid position for uniocular occlusion, depth is not quantitative. They also indicate that Panum's limiting case is not, as has sometimes been claimed, itself a case of da Vinci stereopsis since fusibility is a critical factor for seeing quantitative depth in discrete monocular objects relative to a binocular surface.     

Brightnesses,luminances, and Fechner’s paradox

Monocular brightnesses were varied, without varying monocular luminances, both by means of simultaneous contrast and by means of changes in the level of adaptation. Binocular brightness was shown to change in accord with monocular brightness, independent of monocular luminances.     

Depth interval estimates from motion parallax and binocular disparity beyond interaction space

Static and dynamic observers provided binocular and monocular estimates of the depths between real objects lying well beyond interaction space. On each trial, pairs of LEDs were presented inside a dark railway tunnel. The nearest LED was always 40 m from the observer, with the depth separation between LED pairs ranging from 0 up to 248 m. Dynamic binocular viewing was found to produce the greatest (ie most veridical) estimates of depth magnitude, followed next by static binocular viewing, and then by dynamic monocular viewing. (No significant depth was seen with static monocular viewing.) We found evidence that both binocular and monocular dynamic estimates of depth were scaled for the observation distance when the ground plane and walls of the tunnel were visible up to the nearest LED. We conclude that both motion parallax and stereopsis provide useful long-distance depth information and that motion-parallax information can enhance the degree of stereoscopic depth seen.     

Immaturity,delinquency, and the WechslerP > V sign

The classic psychodiagnostic sign for delinquency —Wechsler Performance IQ being higher than Verbal IQ —has shown generally good validity, improvable by a modifier variable (Warren's I -level system). Reasoning from the I-level immaturity theory of delinquency, the present study investigated age as a possible substitute for the I-level in its role as a moderator variable for the Wechsler P> Vsign, within a population of male juvenile delinquents. As hypothesized, young age predicted a high P > Vscore, supporting the immaturity theory of delinquency. Types of immaturity are discussed. Future work should test the P > Vsign as an aid in evaluating delinquency treatment methods.     

Binocular rivalry and stereoscopic depth perception

An investigation was made of stimulus factors causing retinal rivalry or allowing stereoscopic depth perception, given a requisite positional disparity. It is shown that similar colour information can be “filtered” out from both eyes; that stereopsis is not incompatible with rivalry and suppression of one aspect of the stimulus, and that the strongest cue for perception of stereoscopic depth is intensity difference at the boundaries of the figures in the same direction at each eye. Identity of colour can also act as a cue for stereopsis. The brightness of different monocular figures seen in the stereoscope in different combinations was estimated by a matching technique, and it is suggested that the perceived brightness is a compromise between the monocular brightness difference between figure and ground seen in relation to the binocular fused background, and the mean brightness of the figures. The results are discussed in terms of neurophysiological “on,” “off” and continuous response fibres.     

Statements of Method and Teaching: The Case of Socrates

In this paper, I ponder the question of whether Socrates follows a method of investigation — the method of hypothesis — which he advocates in Plato's Phaedo. The evidence in the dialogue suggests that he does not follow the method, which raises additional questions: If he fails to do so, why does he articulate the method? Does his statement of method affect his actions or is it mainly forgotten? Although Socrates is a fictional character, his actions in the Phaedo suggests questions about the function of espoused methods in actual situations.     

Infants’ ability to respond to depth from the retinal size of human faces: Comparing monocular and binocular preferential-looking

To examine sensitivity to pictorial depth cues in young infants (4 and 5 months-of-age), we compared monocular and binocular preferential looking to a display on which two faces were equidistantly presented and one was larger than the other, depicting depth from the size of human faces. Because human faces vary little in size, the correlation between retinal size and distance can provide depth information. As a result, adults perceive a larger face as closer than a smaller one. Although binocular information for depth provided information that the faces in our display were equidistant, under monocular viewing, no such information was provided. Rather, the size of the faces indicated that one was closer than the other. Infants are known to look longer at apparently closer objects. Therefore, we hypothesized that infants would look longer at a larger face in the monocular than in the binocular condition if they perceived depth from the size of human faces. Because the displays were identical in the two conditions, any difference in looking-behavior between monocular and binocular viewing indicated sensitivity to depth information. Results showed that 5-month-old infants preferred the larger, apparently closer, face in the monocular condition compared to the binocular condition when static displays were presented. In addition, when presented with a dynamic display, 4-month-old infants showed a stronger ‘closer’ preference in the monocular condition compared to the binocular condition. This was not the case when the faces were inverted. These results suggest that even 4-month-old infants respond to depth information from a depth cue that may require learning, the size of faces.     

Mandel'štam and Dante: TheDivine Comedy in Mandel'štam's poetry of the 1930s

Osip Mandel'?tam (1891–1938?) belongs among the greatest Russian poets of the twentieth century. During the thirties, when he led a tragic existence and felt a premonition of his inevitable violent death, Mandel'?tam saw in Dante not only the greatest poet, but also his own superior teacher, and his poems of that period contain a tormented meditation on the masterpiece of Dante's genius — theDivine Comedy. Epic poetry of Dante, Homer, Virgil and others was possible because the inner world of each poet was essentially at one with the ethos of the society in which he lived. Mandel'?tam's inner world was Judaeo-Christian, European, and rooted in classical and neo-Platonic philosophy, but his outer world, consisting of a new Marxist or pseudo-Marxist system, was totally at odds with it. Thus Mandel'?tam could not embody the epic impulse of the society he opposed. He was left with the tormented lyric impulse. The fundamental conflict between Mandel'?tam as a lyric poet and the society in which he had to live and work accounts for the fact that his vision of Stalinist society in a number of respects remarkably corresponds to Dante's vision of a perverted divine order in theInferno.     

On utrocular discrimination

Observers with good stereoacuity judged which eye received sine-wave grating patterns in a two-category forced-choice procedure. Large individual differences were found, but for most observers reliable discrimination was achieved at low spatial frequencies. No observer could perform the task above chance levels at high spatial frequencies. Discrimination was unaffected by retinal location, grating orientation, grating contrast, stimulus duration, or practice with feedback. Among observers who could perform the task, the following results were obtained: (1) Introduction of high spatial frequency components did not interfere with performance so long as a low spatial frequency component was present. (2) When gratings of low equal spatial frequency were presented to both eyes simultaneously at different contrast levels, observers could identify which eye received the higher contrast. (3) At low spatial frequencies, observers could distinguish monocular from binocular presentation. (4) Temporal frequency variations (counterphase flicker) influenced performance for some observers. Binocular summation and interocular transfer were unaffected by the spatial frequency variations which modulate utrocular discrimination. A new procedure for measuring stereopsis was developed which made possible comparison of utrocular discrimination with stereopsis at specific spatial frequencies. Stereopsis appeared mildly affected by spatial frequency.     

Some observations and measurements of the Panum phenomenon

The angular separation between the “binocular” and the “monocular” line of Panum’s limiting case was systematically varied under conditions in which the changes in seen relative depth could be quantified. Stereoscopic, equidistant, and anomalous depth localizations were seen. A criterion of variability of depth localization was utilized to differentiate the mechanism operative in determining the seen depth. When stereopsis is clearly present, depth in Panum’s limiting case is predictable and reveals a one-to-one relationship with the angle of lateral separation of the stereoscopic stimuli, i.e., the odd line cooperates in free binocular vision with both of the paired lines to give “true” stereoscopic depth. The range of angular separation over which Panum’s limiting case will give rise to stereoscopic depth is increased by free eye movements well beyond the usually reported limits of Panum’s retinal areas.     

The more you ignore me the closer I get: An ERP study of evaluative priming

We used event-related brain potentials (ERPs) to investigate the various mental processes contributing to evaluative priming—that is, more positive judgments for targets preceded by affectively positive, as opposed to negative, prime stimuli. To ensure ecological validity, we employed a priori meaningful landscape pictures as targets and emotional adjectives as visual primes and presented both primes and targets for relatively long durations (>1 s). Prime-related lateralized readiness potentials (LRPs) revealed response priming as one source of the significant evaluative priming effect. On the other hand, greater right-frontal positive slow wave in the ERP for pictures following negative, as compared with positive, primes indicated altered impression formation, thus supporting automatic spreading activation and/or affect misattribution accounts. Moreover, target LRPs suggested conscious counter-control to reduce the evaluative priming net effect. Finally, when comparing prime ERPs for two groups of participants showing strong versus weak evaluative priming, we found strong evidence for the role of depth of prime processing: In the weak-effect group, prime words evoked an increased visual P1/N1 complex, a larger posterior P2 component, and a greater left-parietal processing negativity presumably reflecting semantic processing. By contrast, a larger medial-frontal P2/N2 complex in the strong-effect group suggested top-down inhibition of the prime’s emotional content. Thus, trying to ignore the primes can actually increase, rather than decrease, the evaluative priming effect.     

Three contributions to understanding human sexuality

A critical review of three recent studies of sexuality is placed against the background of four groups that have, for the past decade, attempted to discern the most important facts—known or still to be discovered—about human sexuality. The books reviewed are:The Pleasure Bond by William H. Masters and Virginia Johnson;Christian, Celebrate Your Sexuality by Dwight Hervey Small; andMale Homosexuals: Their Problems and Adaptations by Martin S. Weinberg and Colin J. Williams.     

HIPS: Image processing under UNIX. Software and applications

HIPS (Human Information Processing Laboratory’s Image processing System) is a software system for image processing that runs under the UNIX operating system. HIPS is modular and flexible: it provides automatic documentation of its actions, and is relatively independent of special equipment. It has proved its usefulness in the study of the perception of American Sign Language (ASL). Here, we demonstrate some of its applications in the study of vision, and as a tool in general signal processing. Ten examples of HIPS-generated stimuli and—in some cases—analyses are provided, including the spatial filtering analysis of two types of visual illusions; the study of frequency channels with sine-wave gratings and band-limited noise; 3-dimensional perceptual reconstruction from 2-dimensional images in the kinetic depth effect; the perception of depth in random dot stereograms and cinematograms; and the perceptual segregation of objects induced by differential dot motion. Finally, examples of noise-masked, cartoon coded, and hierarchically encoded ASL images are provided.     

Effects of colour on perceived depth: Review of experiments and evalutaion of theories

A selective and evaluative review of experiments and theories dealing with the effect of colour on perceived depth is presented. It has long been known that equidistant objects that differ in colour may appear as if they are located at different distances. The present paper emphasizes the theoretical importance of distinguishing between monocular and binocular effects. There is at present no completely satisfactory explanation of the monocular effect but chromatic aberration seems to be a critical factor. The binocular effect (colour stereoscopy) is most probably due to disparity between differently coloured images on the retinae. The stereoscopic theories of Einthoven (1885) and Vos (1960, 1963, 1966) are discussed; available evidence favours the latter.     

A Visual Illustration of Induction in Multilevel Methods: The Problem of Leaders Awarding Countervailing Merit Components

Purpose

The purpose of this study is to illustrate the use of a multilevel technique, Within and Between Analysis (WABA), for inductively investigating the impact of how supervisory groups influence the process of awarding merit raises (permanent) and performance bonuses (temporary). From a levels of analysis perspective, is this relationship best modeled at the individual subordinate, the whole supervisory-group, or the within-group level?

Design

Archival merit pay data for 2 years were obtained for 71 managers and professionals nested within 21 supervisory groups who encompassed the entire management hierarchy of a 500+ person-manufacturing plant.

Findings

What appeared to be a countervailing relationship at the individual level (r _total = ?.64***), in which raises and bonuses were negatively correlated, was found to be a countervailing relationship at the whole supervisory-group level (r _between = ?.79*** vs. r _within = ?.36*). Given the statistically significant differences between supervisory groups, an induction toward a whole-group effect was made. These countervailing findings were replicated at the group level in the subsequent year’s data.

Implications

The whole-group effect indicates that managers were attempting to create some type of within-group equity by (1) minimizing variability within their groups, and (2), at the same time, trading off raises for bonuses at the whole-group level.

Originality

The application of WABA focuses on testing entities as well as variables, and it can provide a generalizable method for investigating levels of analysis issues in merit pay programs without necessarily advocating that only one level of analysis is universally potent. WABA also allows for the inductive investigation of additional levels of analysis as well as a variety of boundary conditions.     

Making the Decision to Participate in Predictive Genetic Testing for Arrhythmogenic Right Ventricular Cardiomyopathy

This paper describes the experience of predictive genetic testing for Arrhythmogenic Right Ventricular Cardiomyopathy in the context of novel gene discovery. Two approaches to making the decision to engage in genetic testing were apparent: the decision to be tested either (a) develops gradually over time or (b) happens so quickly that it is felt as a “fait accompli.” Six key factors that influenced the particular approach taken by the participants were identified: (1) scientific process—available and relevant predictive genetic test; (2) numerous losses or deaths within the family; (3) physical signs and symptoms of disease; (4) gender; (5) sense of relational responsibility or moral obligation to other family members; and (6) family support. This study found that at risk individuals juxtapose scientific knowledge against their experiential knowledge and the six identified factors in order to make the decision to participate in genetic testing. Recommendations include the creation of a relational space within which to provide psychological counselling and assessment for the six identified factors that shape the decision to engage in predictive genetic testing.     

The Attractiveness of Panentheism—a Reply to Benedikt Paul Göcke

In his recent article in Sophia, Benedikt Paul Göcke concluded that ‘as long as we do not have a sound argument entailing the necessity of the world, panentheism is not an attractive alternative to classical theism’ (Benedikt Paul Göcke, ‘Panentheism and Classical Theism’, Sophia 52, no. 1 (2013): 75). As the article progresses, Göcke clarifies his view of what panentheism is, essentially identical to Göcke’s view of classical theism in every way, except in the world’s modal relation to God. This concept is vastly different to many of the panentheistic notions that are more commonly held. While it is not initially made transparent—especially with the label Göcke chooses to use—it becomes increasingly clear that Göcke critiques a God concept of his own making. More common variations of panentheism are contrasted with Göcke’s version, in order to provide a broader and more accurate view of the ancient concept, and to demonstrate that Göcke’s view of panentheism is idiosyncratic. It is finally explained that even if Göcke’s view of panentheism were definitive, he has not successfully argued for the relative unattractiveness of the concept, relative to his view of classical theism.     

Introduction: A Cognitive Science Slam in Honor of Guy Van Orden

Illusory depth perception experienced in driving simulators is afforded by monocular depth information contained in visual displays. Presumably binocular convergence and binocular disparity, though useful for depth perception in real environments, may poorly contribute to illusory depth in a driving simulator. Instead, they may generate conflicting information by revealing the distance of the display screen and its flatness. Nevertheless, illusory depth induced by monocular information contained in visual displays usually produces enough immersion and realism to create the illusion of driving in a real environment.

Many authors have noted improved depth perception in paintings, photographs, and even in drawings when viewed monocularly. However, this effect, known as monocular advantage, has never been explored in driving simulation. The purpose of this experiment was to assess whether the effect might exist in driving simulation. It was expected that drivers would perceive distances in depth better and more accurately with a monocular than with a binocular viewing of the display. Distance estimates were evaluated for two types of driving maneuvers referred to as alignment and bisection. Results showed that when significant performance differences between monocular and binocular viewing conditions occurred, target cars were perceived farther in depth and more accurately using monocular vision.

Alternative viewing conditions using both eyes are discussed at the end of the article.     

On a neglected variable in theories of pictorial perception: Truncation of the visual field

Theoretical analyses of pictorial perception have concentrated on the consequences of conflicting flatness and depth information in pictures, but have failed to consider the perceptual effects of the truncation of the visual field attendant on any pictorial display. The importance of this variable both for methods of testing pictorial information and for theory building was demonstrated. Under four different viewing conditions, adults were asked to scale the size and distance of five isoceles triangles at five different distances. The four conditions were unobstructed static monocular view, peephole view, view through a rectangular frame, and view of all the stimuli photographed in a slide. The slopes of the peephole, truncation, and slide conditions’ scaling functions were all significantly smaller than the slope of the untruncated Monocular condition, and the Y-intercepts were all greater. A decrease in over-constancy in the size functions indicated a similar effect for all three truncated conditions. Results are interpreted as supporting the hypothesis that truncation of the visual field, both in pictures and in peephole views of the real world, causes a frontal shift in the localization of the visible field, with a resultant compression of perceived size and distance.