Attitude of judgment and reaction time in estimation of size at a distance

Experiment I obtained scalar (absolute) size estimates under full cue conditions for rectangular standards that were presented at distances ranging from 1.22 to 3.05 m. Size-estimate reaction times increased linearly with increasing viewing distance. Reaction times for distance estimation were the same at all distances. Experiment II obtained size estimates over distances ranging from 1.22 to 5.49 m under objective and phenomenal size-estimation instructions. Only objective size-estimate reaction times increased with distance. Phenomenal size estimates were faster then objective estimates and were the same for all viewing distances. It was concluded that the cognitive operations involved in objective size estimation were responsible for the effects obtained in Experiment I and the similar findings reported in earlier studies by Broota and Epstein (1973).     

Superior performance of blind compared with sighted individuals on bimanual estimations of object size

Five preliminary experiments on sighted individuals revealed marked overestimation on an object size-estimation task using a bimanual response. These experiments ruled out the possibility that overestimation was due to the mode of visual presentation (whether two-dimensional or three-dimensional), the input modality (visual or kinesthetic), or the influence of other visual cues. The main experiment then investigated whether these distortions are due to visual experience by using a variant of the same task to test 24 blind and 24 sighted control participants. Remarkably, the sighted control participants overestimated object size, on average, but the blind participants did not. A follow-up experiment demonstrated that visual memory was the primary influence causing the size over-estimations. We conclude that blind individuals are more accurate than sighted individuals in representing the size of familiar objects because they rely on manual representations, which are less influenced by visual experience than are visual memory representations.     

Body Image or Body Images?: Comparative,Multidimensional Assessment Among College Students

A major criticism of research on body image concerns the dubious assumptions of the unidimensionality of the construct and the equivalence of body-image measures. Our study of 125 male and female college students compared multiple measurement methods within each of two modalities of body image. (a) perceptual (body-size estimation) and (b) attitudinal (body-image affect and cognition). Clinically relevant indices of psychological adjustment and eating disturbance were included. Results clearly supported the distinction between attitudinal and perceptual modalities of body image and indicated more convergent and discriminant validity for the former than for the latter. Whereas one method of assessing size-estimation accuracy and most body-image attitudes produced relationships with maladjustment, only attitudinal body image and perceptual, self-ideal discrepancy measures were significantly linked to eating disturbance. Relationships were generally more consistent for women that for men. Implications are discussed in the context of extant and future research on body image with clinical and nonclinical populations.     

Body image or body images?: Comparative, multidimensional assessment among college students

A major criticism of research on body image concerns the dubious assumptions of the unidimensionality of the construct and the equivalence of body-image measures. Our study of 125 male and female college students compared multiple measurement methods within each of two modalities of body image: (a) perceptual (body-size estimation) and (b) attitudinal (body-image affect and cognition). Clinically relevant indices of psychological adjustment and eating disturbance were included. Results clearly supported the distinction between attitudinal and perceptual modalities of body image and indicated more convergent and discriminant validity for the former than for the latter. Whereas one method of assessing size-estimation accuracy and most body-image attitudes produced relationships with maladjustment, only attitudinal body image and perceptual, self-ideal discrepancy measures were significantly linked to eating disturbance. Relationships were generally more consistent for women than for men. Implications are discussed in the context of extant and future research on body image with clinical and nonclinical populations.     

Does nondirectional signalization of target distance contribute to navigation in the Morris water maze?

The possibility that rats can navigate in the Morris water maze by reducing the difference between the memorized platform scene and the current sensory input was tested in nine blind rats. A computerized videosystem monitored the rats' movements in the pool and converted the rat-target distance into tones the frequency of which increased in 64 equal steps from 120 Hz at 128 cm to 7680 Hz at 0 cm. During 15 days of training to find a fixed platform position from different starting points (12 trials per day) average escape latencies decreased from 39.0 to 25.4 s. The performance significantly deteriorated when the acoustic distance signalization was omitted and/or when the target position was changed form trial to trial. It is concluded that blind rats solved the task by simultaneously employing search strategy based on position responses, mapping using acoustic background beacons, and distance reduction navigation. It is argued that the various strategies are additive and that their relative significance depends of the conditions of the experiment.     

Stimulus generalization along a dimension based on a verbal concept

The present study examined generalization along a dimension based on a verbal concept of occupational status. The status dimension was scaled by students who placed occupation names into five status categories, Category 1 representing highest status and Category 5 the lowest status. In two experiments, key presses by students were occasionally reinforced when a slide showing an occupation name from Status Category 3 was present. For half the subjects, key presses were not reinforced during a name from Category 1; for the other half, presses were not reinforced during a name from Category 5. Occupation names from all status categories were later singly presented. In this generalization test, subjects typically divided the dimension into two parts, responding alike to all names within each part. The results suggest that generalization along a dimension in humans is mediated by a subject's verbal classifications of stimuli.     

Effects of a meaningful, a discriminative, and a meaningless stimulus on equivalence class formation

Thirty college students attempted to form three 3-node 5-member equivalence classes under the simultaneous protocol. After concurrent training of AB, BC, CD, and DE relations, all probes used to assess the emergence of symmetrical, transitive, and equivalence relations were presented for two test blocks. When the A-E stimuli were all abstract shapes, none of 10 participants formed classes. When the A, B, D, and E stimuli were abstract shapes and the C stimuli were meaningful pictures, 8 of 10 participants formed classes. This high yield may reflect the expansion of existing classes that consist of the associates of the meaningful stimuli, rather than the formation of the ABCDE classes, per se. When the A-E stimuli were abstract shapes and the C stimuli became S(D)s prior to class formation, 5 out of 10 participants formed classes. Thus, the discriminative functions served by the meaningful stimuli can account for some of the enhancement of class formation produced by the inclusion of a meaningful stimulus as a class member. A sorting task, which provided a secondary measure of class formation, indicated the formation of all three classes when the emergent relations probes indicated the same outcome. In contrast, the sorting test indicated "partial" class formation when the emergent relations test indicated no class formation. Finally, the effects of nodal distance on the relatedness of stimuli in the equivalence classes were not influenced by the functions served by the C stimuli in the equivalence classes.     

Wear behaviour of a gradient surface produced by a punching process in a Cu-30 Ni alloy

The grain size variation in a gradient surface produced by a punching and recovery process on a Cu-30Ni alloy has been observed by atomic force microscopy. The friction characteristics of the gradient surface in a 3.5 wt% NaCl solution were investigated using a micro-indenter probe, a pin-on-disc type tribometer, a strain sensor and an optical microscope. The results showed that the hardness and grain size can be well represented by the Hall–Petch relationship when the gain size is more than 30?nm. The wear rate, friction coefficient and adhesive force all increase depth below the surface. These variations are attributed to a gradual increasing grain size with depth. The morphologies of the worn track were also studied to understand further the corrosive wear behaviour of gradient surfaces.     

Divided stimulus control: a replication and a quantitative model

Four pigeons were trained on a conditional discrimination. The conditional stimuli were compounds of pairs of stimuli from two different dimensions, fast versus slow cycles of red or green stimuli, and short- versus long-duration presentations of these cycles. Across conditions, the probability of reinforcers for correctly responding to each dimension was varied from 0 to 1. Discriminability, measured by log d, for stimuli on a dimension increased as the relative frequency of reinforcers for that dimension increased, replicating the results of Shahan and Podlesnik (2006). Two further conditions showed that discriminability between stimuli on each dimension was unaffected by whether the stimuli on the other dimension varied or were constant. Finally, maximal discriminability was unchanged in a redundant-relevant cues condition in which either of the stimuli comprising a compound signaled the same correct response. Davison and Nevin's (1999) model provided an excellent quantitative account of the effect of relative reinforcer frequency on discriminability, and thus of the way in which divided stimulus control is itself controlled by relative reinforcement.     

Finding a face in a face-like object

Humans have the tendency to perceive a face even in a non-living object. Previous studies report that people perceive facial features and even interpret a personality in a car front. Following these findings, we investigated whether the perception of a face in a face-like object is mediated by human face processing, which involves both featural and configural processing. In our experiment, participants were presented with 30 face-like objects and were asked about the existence of facial features, the intensity of typicality/distinctiveness, and the intensity of facial expression. Using multiple regression analysis, which predicts the perception of a face in a face-like object, we found that the existence of eyes was a significant predictor of variance in perceiving a face in a face-like object.     

Airflow as a discriminative stimulus

In one experiment, pigeons were taught to discriminate airflow by having availability of reinforcement signalled by its presence and extinction signalled by its absence. After they reached criterion, some were trained on a discrimination reversal. Others were trained on an intradimensional discrimination with a low airflow velocity associated with reinforcement and a higher airflow velocity associated with extinction. All discriminations were learned rapidly, indicating that airflow velocity can function as a discriminative stimulus. In the second and third experiments, naive pigeons were trained to discriminate the presence of a compound stimulus (one of three tonal intensities paired with one of three airflow velocities) from its absence. These pigeons were subsequently given a component stimulus test during extinction on four stimulus values; the two training values, the tone alone, and the airflow alone. High or moderate velocity airflow controlled more responding than any of the three tone intensities. However, low velocity airflow controlled more responding only when a low intensity tone was employed.     

Hefting for a maximum distance throw: a smart perceptual mechanism

Objects for throwing to a maximum distance were selected by hefting objects varying in size and weight. Preferred weights increased with size reproducing size-weight illusion scaling between weight and volume. In maximum distance throws, preferred objects were thrown the farthest. Throwing was related to hefting as a smart perceptual mechanism. Two strategies for conveying high kinetic energy to projectiles were investigated by studying the kinematics of hefting light, preferred, and heavy objects. Changes in tendon lengths occurring when objects of varying size were grasped corresponded to changes in stiffness at the wrist. Hefting with preferred objects produced an invariant phase between the wrist and elbow. This result corresponded to an optimal relation at peak kinetic energy for the hefting. A paradigm for the study of perceptual properties was compared to size-weight illusion methodology.     

The impact of a stillbirth on a marriage

The crippling consequences on family life of the failure to mourn a stillbirth adequately are demonstrated in a vulnerable couple. They were helped by brief, planned, focal, conjoint marital psychotherapy which is described.     

Beliefs and inferences—a test of a rational-emotive hypothesis: 3. On expectations about enjoying a party

Ninety-six subjects were asked to imagine that they were going to a party. They were further asked to imagine (a) that they adhered to a rational or an irrational belief; (b) that they had jilted or been jilted by a partner with whom they were having an intimate relationship; and (c) that they knew or did not know other friends who would be going to the party. Whilst in role, subjects were asked to make inferences about various aspects of their enjoyment of the party. The results supported the hypothesis that holding an irrational belief leads to more negatively distorted inferences than holding a rational belief, and that having been jilted by a partner would have a similar effect. There was only limited support for the hypothesis that the second two independent variables would have a moderating or amplifying effect on the negativity of inferences through interaction with the belief variable. The implications of these findings for counselling are discussed, especially with respect to challenging irrational beliefs.     

Interindividual‐intergroup discontinuity as a joint function of acting as a group and interacting with a group

An experiment assessed the prisoner's dilemma game (PDG) choices of a set of three persons who interacted with another supposed set of three persons. There were four conditions: (1) group‐on‐group (both three‐person sets constrained by a majority vote), (2) group‐on‐one (only own three‐person set constrained by a majority vote), (3) one‐on‐group (only other three‐person set constrained by a majority vote), (4) one‐on‐one (neither three‐person set constrained by a majority vote). The four conditions were compared with three orthogonal contrasts. Consistent with the assumption that interindividual interactions are less competitive than interactions involving groups, the first contrast indicated that there were fewer competitive choices in the one‐on‐one condition than in the other three conditions pooled. Consistent with the assumption that competitiveness can flow either from acting as a group or interacting with a group, the second contrast found no significant difference between the group‐on‐one and one‐on‐group conditions. Finally, consistent with the assumption that the interindividual‐intergroup discontinuity effect is a joint function of acting as a group and interacting with a group, the third contrast revealed that there were more competitive choices in the group‐on‐group condition than in the one‐on‐group and group‐on‐one conditions pooled. Copyright © 2006 John Wiley & Sons, Ltd.     

Memories of a 'decision-map': Recall of a real-life decision

First-year students in college who had participated in a study of college-decision-making 8 to 20 months earlier were asked to recall the criteria they had used and the alternatives they had considered in making the decision. They were also asked to describe the criteria they thought, in retrospect, that they ought to have used, and to rate their satisfaction with the decision-making process and its outcome. Two hundred and seven of the original 322 participants responded to a follow-up questionnaire through the mail. Participants recalled about half of the criteria they originally reported using, and about two-thirds of the schools they originally reported considering. Their recall of criteria was affected by their current view of teh criteria they should have used, providing a replication for previous findings. No gender or academic ability effects were found. Somewhat surprisingly, given existing literature, recall was unaffected by emotional responses to the decision, either those reported during the decision-making process or those reported retrospectively. Overall, the pattern of results suggests that memory is affected by a decision-maker's current cognitive framework of the decision, specifically, their retrospective view of how they ought to have made the decision. Moreover, memory is far from perfect, even for stimuli that the decision-maker generated her- or himself, and to which presumably, they gave significant amounts of thought.     

Generation of a pictorial code

In Experiments I and II direct measures were obtained of the time required to convert a picture or a sentence to a report of visualization or to a simple drawing, latencies were faster for pictures than for sentences and were affected by the surface form of the sentence. In Experiment Ill, Ss matched pictures or sentences against a test picture under conditions of simultaneous or successive presentation. “Yes” and “No” response times were affected by sentence form under both conditions, although the difference between sentence-picture and picture-picture comparisons was virtually eliminated under the successive condition. In Experiment IV, Ss held a sentence or picture in memory over a 1,500-msec interval at the end of which a test picture or an instruction to draw the design was presented. Construction latencies were shorter in response to pictures than sentences, and there were effects of sentence form on verification time. Some implications of these results are discussed.     

Cortical shape adaptation transforms a circle into a hexagon: a novel afterimage illusion

After viewing a colored figure on a uniform gray background, an observer will see a negative afterimage after the colored figure disappears. This study shows that the shapes of afterimages vary systematically according to the shape of the adaptation stimuli, a phenomenon that could be caused only by cortical shape adaptation. In the experiments reported here, participants typically saw a hexagonal afterimage after viewing a circle and sometimes saw a circular afterimage after viewing a hexagon. When observers were adapted to rotating circles or hexagons, which produced the same circular retinal painting, they reliably reported that afterimages of circles appeared as hexagons, and vice versa. Furthermore, the fact that this effect also arose through interocular transfer confirms that a cortical process with binocular inputs must have contributed to it. This novel finding reveals that afterimage formation is determined mainly by a cortical process, not by retinal bleaching, and that rival mechanisms detect corners and curves of shapes in cortical processing.     

Variations in mood state as a function of a football season

Scores on the Profile of Mood States were collected from football players at a small university each week prior to a Saturday football contest. The scores were analyzed to assess whether mood varied as a function of the outcome of the previous week's game. Although the subjects' overall mood state was not influenced by the outcome of the games, scores on Tension, Vigor, Fatigue, and Confusion varied. Fatigue and Confusion were related to the outcomes of the games and gave partial support to the hypothesis that the players' mood would vary according to the outcome of the games played.