Orientation misperceptions induced by contrast polarity: comment on "Contrast polarities determine the direction of Café Wall tilts" by Akiyoshi Kitaoka, Baingio Pinna, and Gavin Brelstaff (2004)

According to Kitaoka et al (2004, Perception 33 11-20), the Café Wall illusion can be reduced to misalignment effects produced locally by a large shape on a line passing nearby. I demonstrate here that the interacting units are edges and not whole shapes, and that the source of the illusion does not consist in a local tilt but in a tendency of the edges to join when they have the same contrast polarity.     

Further studies of the Café Wall and Hollow Squares illusions

The effect of varying the contrast on the apparent convergence is measured for both the Café Wall and the Hollow Squares (Taylor-Woodhouse) illusions. The apparent convergence is dependent on the contrast, and also on the size of the stimulus, and varies in the same way for both illusions. This strengthens the argument that the illusions are not independent, as Taylor and Woodhouse originally claimed. McCourt has discussed brightness induction as a basis of the Café Wall illusion. Consideration of this theory leads to some interesting examples of interactions of the two illusions, and to a further, very strong, variation of the illusion in a real-life situation.     

Do the eyes have it? Cues to the direction of social attention

The face communicates an impressive amount of visual information. We use it to identify its owner, how they are feeling and to help us understand what they are saying. Models of face processing have considered how we extract such meaning from the face but have ignored another important signal - eye gaze. In this article we begin by reviewing evidence from recent neurophysiological studies that suggests that the eyes constitute a special stimulus in at least two senses. First, the structure of the eyes is such that it provides us with a particularly powerful signal to the direction of another person's gaze, and second, we may have evolved neural mechanisms devoted to gaze processing. As a result, gaze direction is analysed rapidly and automatically, and is able to trigger reflexive shifts of an observer's visual attention. However, understanding where another individual is directing their attention involves more than simply analysing their gaze direction. We go on to describe research with adult participants, children and non-human primates that suggests that other cues such as head orientation and pointing gestures make significant contributions to the computation of another's direction of attention.     

Does head-movement feedback calibrate the perceived direction of optical motions?

Vertical motions of the head were made to cause diagonal optical motions by using an electronic rearrangement technique. Constancy of visual position during the head movement showed a rapid adaptive change; however, no change was found in perceived movement direction when the head was then held stationary and a vertical object movement presented. These results confirm that a memory exists for the correlation between head motion and optical motion, but indicate that this memory does not control the perception of externally generated optical motions. Together with earlier evidence, the results suggest that the memory lies in the eye-movement control system and in a part of that system which is operative during head movement. but not during passively viewed object movement.     

Control over the processing of the opponent’s gaze direction in basketball experts

Basketball players’ responses to an opposing players’ pass direction are typically delayed when the opposing player gazes in another than the pass direction. Here, we studied the role of basketball expertise on this, the so-called head-fake effect, in three groups of participants (basketball experts, soccer players, and non-athletes). The specific focus was on the dependency of the head-fake effect on previous fake experience as an index of control over the processing of task-irrelevant gaze information. Whereas (overall) the head-fake effect was of similar size in all expertise groups, preceding fake experience removed the head-fake effect in basketball players, but not in non-experts. Accordingly, basketball expertise allows for higher levels of control over the processing of task-irrelevant gaze information.     

Is it possible to experimentally determine the extension of cognition?

Various analytical tools originally developed for theories of mechanistic explanation have recently been imported into the ongoing debate on the hypothesis of (extracerebrally) extended cognition (HEC). One such tool that appears particularly relevant to that debate is Craver’s mutual manipulability account of constitution (MM), most of all because it promises to settle the debate on experimental grounds. This paper investigates whether it is possible to deliver on that promise. We first find that, far from grounding an experimental evaluation of HEC, MM is conceptually incompatible with both internalist and externalist accounts of cognition. Next, we propose a suitable modification of MM, MM*, but it turns out that MM* presupposes rather than produces clarity on the extension of cognition. Moreover, subject to MM* the inference to constitution is radically empirically underdetermined. Finally, we argue that our results can be generalized and conclude that, for principled reasons, it is impossible to experimentally determine whether cognitive processes have extracerebral constituents. Determining the extension of cognition is an inherently pragmatic matter.     

Turn right or turn left? Heuristic of adhering to the direction of destination

It has been found that humans not only tend to avoid the middle routes and prefer the peripheral routes among multiple choices, but also rely on the ‘initial segment strategy’ to select the route. In this paper, we propose a new heuristic which humans apply during route selection: Participants prefer the route whose initial direction lies in the direction of their final destination, while avoiding the route whose initial direction does not. Four maps were designed. The pathways, on different maps, constituted a parallelogram, a rectangle and a square. Pedestrians were instructed to select a route from an origin to a destination on one of the maps. The results confirm the application of the newly proposed heuristic. Other possible factors, such as handedness, route angles and occurrence of turns were excluded. Moreover, the heuristics of deferring decision and relying on initial straightness are not supported. Copyright © 2010 John Wiley & Sons, Ltd.     

Do the sources of the urban elderly's social support determine its psychological consequences?

This article examines whether the psychological impact of different kinds of social supports varies according to who provides them. Data on 82 older adults' social relationships, measured as social provisions (Weiss, 1974), were used to evaluate whether the relationship between social provisions and emotional well-being varied when kin and, alternatively, nonkin, made the provisions. Findings showed that, although most social provisions were valuable regardless of their source, reassurance of worth was distinctly more beneficial when provided by nonkin than by kin, and reliable alliance, or instrumental assistance, was more strongly related to well-being when provided by kin than by nonkin. Analysis of social network structure showed that "multiplexity" was negatively related to well-being, and having duplicate providers for a given social provision was uniquely important in offsetting negative affect.     

Fearful asymmetry: Kierkegaard’s search for the direction of time

The ancient problem of whether our asymmetrical attitudes towards time are justified (or normatively required) remains a live one in contemporary philosophy. Drawing on themes in the work of McTaggart, Parfit, and Heidegger, I argue that this problem is also a key concern of Kierkegaard’s Either/Or (1843). Part I of Either/Or presents the “aesthete” as living a temporally volatilized form of life, devoid of temporal location, sequence and direction. Like Parfit’s character “Timeless,” these aesthetes are indifferent to the direction of time and seemingly do not experience McTaggart’s “A-Series” mode of temporality. The “ethical” conception of time that Judge William offers in Part II contains an attempt to normativize the direction of time, by re-orienting the aesthete towards an awareness of time’s finitude. However, the form of life Judge William articulates gives time sequentiality but not necessarily the robust directionality necessary to justify (and make normative) our asymmetrical attitudes to time. Hence while Either/Or raises this problem it remains unanswered until The Concept of Anxiety (1844). Only with the eschatological understanding of time developed in The Concept of Anxiety does Kierkegaard answer the question of why directional and asymmetrical conative and affective attitudes towards time are normative.     

Going my way? The benefits of travelling in the same direction

Couples' marital satisfaction can depend on whether they commute to work in the same or different directions. Two surveys, conducted in the United States and Hong Kong, showed that partners' satisfaction with their relationship was greater when they traveled to work in the same direction than when they traveled in different directions. This was true regardless of whether the partners left for work at the same or different times. A controlled laboratory study eliminated alternative interpretations of the survey findings, showing that even randomly paired participants reported greater attraction to one another when they walked to an experimental task in the same direction rather than in different directions.     

Does the direction and magnitude of cognitive change depend on initial level of ability?

Longitudinal change in five cognitive abilities was investigated to determine if the direction or magnitude of change was related to the individual's ability level. Adults between 18 and 97 years of age performed three versions of 16 cognitive tests on two occasions separated by an average of 2.7 years. In order to control for influences associated with regression toward the mean, level of ability was determined from scores on the first version of the cognitive tests on the first occasion, and across-occasion change was examined on the second and third versions. Change in every cognitive ability was significantly more negative with increased age. However, there was little indication of ability-dependent change in any of the five cognitive abilities, either in differences between composite scores, or in estimates of latent change. Although there are reasons to expect cognitive change to be less negative at either high or low levels of ability, these data suggest that neither the direction nor magnitude of change is related to initial ability when influences of regression toward the mean are controlled.     

Have you got the look? Gaze direction affects judgements of facial attractiveness

Much is known about the attractiveness of physical attributes, such as symmetry and averageness. Here we examine the effect of a social cue, eye-gaze direction, on facial attractiveness. Given that direct gaze signals social engagement, we predicted that faces showing direct gaze would be preferred to faces showing averted gaze. Thirty-two males completed two tasks designed to assess preferences for female faces displaying a neutral expression. Participants were more likely to select the face with direct gaze, when choosing the more attractive face from direct- and averted-gaze versions of the same face. This direct-gaze preference was stronger for high-attractive than low-attractive face sets, but was present for both. Attractiveness ratings were also higher for faces with direct than averted gaze. Interestingly, stimulus inversion weakened the preference for inverted faces, which suggests the preference does not simply reflect a bilateral symmetry bias.     

On the representation of intentions: Do personally relevant consequences determine activation?

The intention-superiority effect describes shorter latencies for reactions to stimuli intended for future enactment, relative to stimuli associated with no enactment or canceled enactment. Previous attempts to demonstrate an intention-superiority effect for other types of tasks—for instance, observing the experimenter executing actions—have not yielded an intention-superiority effect. A reason for this could be that the typical enactment task was associated with a higher degree of personal relevance than were other laboratory-based tasks and that task importance or its consequences heighten the accessibility of intention-relevant materials. In two experiments, we demonstrate an intention-superiority effect for different types of tasks (e.g., monitoring a video clip) when task realization has personally relevant consequences in terms of a performance evaluation. In contrast, we found no intention-superiority effect when future enactment had no personally relevant consequences for participants. These findings imply that the intention-superiority effect is not restricted to actions but occurs generally for relevant plans.     

Does your body count? Embodied influences on the preferred counting direction of preschoolers

Many studies confirm that preschoolers from left-to-right reading societies count from left to right, which reflects the cultural direction of their spatial-numerical associations (SNAs). Other factors, not directly related to cultural experience, have not yet been systematically examined as potential determinants of counting direction in preschool children. In this study, we test one such determinant, i.e. whether and how counting direction is related to body-centred reference frames, such as a preferred hand in different spatial-motoric settings. We first asked preschoolers to count spontaneously. Then, we asked them to use a particular hand to count objects presented close to or far away from their bodies. An overall left-to-right counting dominance was replicated, but it was modulated by a counting hand in both tasks: Children preferred to start counting from an object ipsilateral to the hand used. This pattern increased when stimuli were in a position close to the body. We conclude that early counting preferences of preliterate children are embodied. The SNAs which were assessed are not only related to culture but also to situated individual bodily reference frames.     

What subjective experiences determine the perception of falling asleep during sleep onset period?

Sleep onset is associated with marked changes in behavioral, physiological, and subjective phenomena. In daily life though subjective experience is the main criterion in terms of which we identify it. But very few studies have focused on these experiences. This study seeks to identify the subjective variables that reflect sleep onset. Twenty young subjects took an afternoon nap in the laboratory while polysomnographic recordings were made. They were awakened four times in order to assess subjective experiences that correlate with the (1) appearance of slow eye movement, (2) initiation of stage 1 sleep, (3) initiation of stage 2 sleep, and (4) 5 min after the start of stage 2 sleep. A logistic regression identified control over and logic of thought as the two variables that predict the perception of having fallen asleep. For sleep perception, these two variables accurately classified 91.7% of the cases; for the waking state, 84.1%.     

What factors determine the preferred gait transition speed in humans? A review of the triggering mechanisms

Human locomotion is a fundamental skill that is required for daily living, yet it is not completely known how human gait is regulated in a manner that seems so effortless. Gait transitions have been analyzed to gain insight into the control mechanisms of human locomotion since there is a known change that occurs as the speed of locomotion changes. Specifically, as gait speed changes, there is a spontaneous transition between walking and running that occurs at a particular speed. Despite the growing body of research on the determinants of this preferred transition speed and thus the triggering mechanisms of human gait transitions, a clear consensus regarding the control mechanisms of gait is still lacking. Therefore, this article reviews the determinants of the preferred transition speed using concepts of the dynamic systems theory and how these determinants contribute to four proposed triggers (i.e. metabolic efficiency, mechanical efficiency, mechanical load and cognitive and perceptual) of human gait transitions. While individual anthropometric and strength characteristics influence the preferred transition speed, they do not act to trigger a gait transition. The research has more strongly supported the mechanical efficiency and mechanical load determinants as triggering mechanisms of human gait transitions. These mechanical determinants, combined with cognitive and perceptual processes may thus be used to regulate human gait patterns through proprioceptive and perceptual feedback as the speed of locomotion changes.     

To Be a Butterfly on the Wall of This Mansion …: In Place of a Response

This paper considers how the range of insights developed in the commentary of this special issue resonate with—rather than merely reflect upon—the ideas Cleonie J. White and I develop in our respective contributions.     

Can the Same Politician Help and Hurt the Evaluations of Another Politician? The Role of Categorization on the Elicitation of Assimilation and Contrast Effects in the Mexican Political Context

Two studies investigated the effects of bringing a highly controversial politician to mind on the evaluations of another politician in the Mexican political context. We took advantage of the dynamic nature of the Mexican political context in which politicians often threaten to leave or actually leave their political parties, influencing the categorization process. We hypothesized that the same controversial politician could elicit assimilation and contrast effects on the evaluations of another politician, depending on whether both political figures were treated as lateral categories or members of the same superordinate category. Study 1 found support for the predicted contrast effects but only among those who did not classify both political figures as members of the same political party. Study 2 found support for the expected interexemplar assimilation effects but only among those who classified both political figures as members of the same political party. The theoretical and applied implications of our results were discussed.