Inaccuracy of Affordance Judgments for Firefighters Wearing Personal Protective Equipment

In order to safely negotiate cluttered and dangerous environments, firefighters must efficiently and effectively make affordance judgments. Failure to do so could put them at risk for slips, trips, and falls, which are major causes of injuries for firefighters. We examined how well firefighters were able to perceive their obstacle crossing abilities while wearing firefighting protective equipment. Firefighters were asked to judge whether they could cross over, under, and through different obstacles that simulated idealized fireground situations. Perceptual judgment errors were found for each obstacle type, the largest occurring with an overestimation of ability to pass under an obstacle. Years of experience had a moderate positive correlation with absolute judgment error in the “over” and “under” obstacles. Overall, a general lack of awareness of their personal protective equipment for obstacle crossing ability was observed. A better understanding of how to reduce judgment error while wearing firefighter protective gear would likely decrease the risk of injuries on the fireground.     

Body Language of Women and Judgments of Vulnerability to Sexual Assault

The present study experimentally examined the effects of body language on judgments of vulnerability to sexual assault by strangers. Four features of body language (stride length, weight shift, body-limb movement, and foot movement) were manipulated to create 2 typical victim profiles and 1 typical nonvictim profile. Short videotapes of 3 adult female models walking alone in each of the 3 body language profiles were filmed. Forty-one college students and 33 police officers individually viewed 3 videotapes (each showing a different model and a different body language profile) and made judgments for each about the woman's confidence level and vulnerability to sexual assault. As predicted, women in the 2 victim profiles were judged to be significantly more vulnerable to sexual assault and significantly less confident than women in the nonvictim profile. Implications and suggestions for future research are discussed.     

Postural and Locomotor Contributions to Affordance Perception

The authors sought to evaluate the relative importance of locomotor control and postural control in the perception of affordances. While seated in a stationary wheelchair, participants made a series of judgments about the minimum lintel height under which they could roll in the wheelchair. Prior to making judgments, participants were given brief (～2 min) experience with wheelchair locomotion. They expected that this practice would influence the accuracy of subsequent affordance judgments. During practice, participants moved under their own power (using their hands on the wheels) or with an experimenter pushing the wheelchair. Also during wheelchair locomotion the participant's head was restrained, or was not. Results revealed that head restraint during the practice session had no effect on the accuracy of subsequent judgments. By contrast, the judgments of participants who controlled locomotion during practice were significantly more accurate than the judgments of participants who had not controlled their locomotion during practice.     

Self-Induced Motion Sickness and Body Movement During Passive Restraint

From both direct-realist and motor-theoretic perspectives, the objects of speech perception are construed as articulatory events. We offer the alternative view that it is the auditory properties of phonetic events to which listeners are primarily sensitive. Evidence for this alternative view comes from a variety of sources, including studies of phonetic and phonological universals, comparisons of the perception of speech and nonspeech signals, cross-language perceptual experi- ments, and studies of phonetic categorization by nonhuman animals.     

Breadth and Limits of the Affordance Concept

Kirlik (this issue) reviews my recent (Stoffregen, 2003b) definition of affordance and suggests that it is too broad. Kirlik argues that the concept of affordance should include only things that are opportunities for action. In replying, I agree that affordance should be restricted to opportunities for action. However, I argue that action can and should include the great majority of animate behavior and possibly all of it. Finally, I argue that the concept of affordance is not unbounded but rather has strict limits.     

The Integration of Body Movement and Attention in Young Infants

The normal development of adaptive behavior in humans depends on the integration of visual attention and body movement, yet little is known about the initial state of movement-attention coupling at the beginning of postnatal life. We studied 1- and 3-month-old infants during extended periods of visual exploration and found that spontaneous shifts of gaze are preceded by rapid changes in general body movement. The results reveal a tight link between motor activation and overt attention on a time scale of seconds or less. This link undergoes substantial developmental change in the first few weeks after birth. During that time, phasic motor activation may play a key role in visual exploration by helping to unlock gaze when the environment is unchanging.     

The Role of Body Weight,Waist-to-Hip Ratio,and Breast Size in Judgments of Female Attractiveness

It was demonstrated by Singh and Young (1995)that morphological features such as overall body fatdistribution measured by waist-to-hip ratio (WHR) andbreast size, influence judgments of femaleattractiveness, age, and desirability for relationships. Thepresent study was a replication and extension of thatresearch, using both male and female participants. Theresults supported the general findings of the original study, and as predicted, the effect of breastsize on attractiveness judgments depended on overallbody fat and WHR. The significance of interactionswithin the different morphological features whichdetermine female attractiveness were noted. Overall,there were surprisingly few sex differences. Results arediscussed in terms of the socio-biological theoriescurrently popular in the literature.     

The Equivalence of Contingency Structure for Intuitive Covariation Judgments About Height,Weight, and Body Fat

In a complete between-subjects design, 576 respondents judged covariations of problems framed around height, weight, and body fat. A verbal measure was used, consisting of prepositional statements representing relationships between two of the variables, as well as two types of response options: true or false, and a 7-point, bipolar, Likert-type scale. Consistent with previous findings, weight and body fat were unambiguously judged as if positively correlated; there were indications of a perceived negative correlation of height and body fat; and there was no evidence that participants regarded height and weight as positively correlated. Furthermore, there was no reliable evidence in support of framing effects. However, there were indications of influence for conditional format. These findings are discussed relative to previous and ongoing research efforts, and it is concluded that it may be inappropriate to regard variations in conditional format as parallel items. Measures involving all possible variations are considered fundamentally unbiased and consistent with I. Ajzen's (1988) principle of aggregation.     

Perception of Sex From Complex Body Movement in Young Children

This article reports on a study of the perception of sex from complex body movement. Studies by Cutting and his associates (Barclay, Cutting, & Kozlowski, 1978; Kozlowski & Cutting, 1977) and by Runeson and Frykholm (1983) have shown that adult observers of both adult and child actors (11-12 years old) can reliably recognize the sex of the actor. In this study, prepubescent actors (4-5 years old) were employed, and the role of familiarity of observers with children of this age was also examined. Ten children (4-5 years old), 5 boys and 5 girls, performed 7 actions similar to those employed in Runeson and Frykholm's study: walking in a circle, running in a circle, throwing a ball, lifting a box, sitting on the floor, sitting on a chair, and climbing onto a chair and jumping down. Point-light displays were made of each child performing each action. Each actor was recorded performing each action once. An experimental tape was prepared in which all 70 acts from the source tape appeared in a counterbalanced order such that each child appeared once in each block of 10 trials and each action appeared once in each block of 7 trials. The effect of familiarity was explored by employing 3 different groups of observers: the parents of the child actors, a group of adults familiar with children of this age, and a student group of young adults not familiar with children of this age. The overall detection rate was only just above chance and none of the observer groups performed better than chance. Sex was reliably perceived, however, for particular actors and for particular actions. The implications of these findings for Runeson and Frykholm's kinematics specifies dynamics principle are noted.     

“动作-评价”效应:动作与认知的交互作用

"动作-评价"效应是具身认知理论的一个重要的支持性证据。早期研究表明,人们倾向于对积极刺激做"拉"反应而对消极刺激做"推"反应,进而在效价评定过程中表现出一种"动作-评价"效应。而随后一系列研究发现该效应的表现模式并非固定,并且该效应的发生不仅限于"推拉"动作。相应的,研究者也对这些现象做出了多种观点解释。进一步研究需继续深入探索"动作-评价"效应的本质及该效应的局限范围,以统合各种观点。     

Judgments of proportions

This study investigated the processes that underlie estimates of relative frequency. Ss performed 4 tasks using the same stimuli (squares containing black and white dots); they judged "percentages" of white dots, "percentages" of black dots, "ratios" of black dots to white dots, and "differences" between the number of black and white dots. Results were consistent with the theory that Ss used the instructed operations with the same scale values in all tasks. Despite the use of the correct operation, Ss consistently overestimated small proportions and underestimated large proportions. Variations in the distributions of actual proportions affected the extent to which Ss overestimated small proportions and underestimated large proportions in the direction predicted by range-frequency theory. Results suggest that proportion judgments, and by analogy probability judgments, should not be taken at face value.     

Effects of Affordance Perception on the Initiation and Actualization of Action

Studies have shown information specifying some affordances may be faster or easier to perceive than others. This article investigates the effect of affordance perception on the time taken to initiate and perform an action. In particular it focuses on how action timing varies as a function of a continuum of afforded action, that is, around an action-boundary. In Experiment 1, participants made judgments regarding whether they could fit a small ball through a series of different size apertures. Judgments were quick and accurate at the extremes of the affordance scale; however, at the perceived action-boundary longer, more variable initiation times (ITs) were observed. Trials repeated over 3 consecutive days revealed a systematic change in the IT distribution and demonstrated that IT is highly sensitive to changes in location of the perceived action-boundary. In Experiment 2 effects of action-scaling were observed on IT and movement time of afforded actions: around the perceived action-boundary the afforded action took longer to be both perceived and acted upon. The results highlight that affordance perception influences not only action selection and preparation but also the action itself. The findings are discussed in terms of the informational basis of action responses.     

Judgments of learning and improvement

Can learners accurately judge the rate of their learning? Rates of learning may be informative when study time is allocated across materials, and students' judgments of their learning rate have been proposed as a possible metacognitive tool. Participants estimated how much they improved between presentations in multitrial learning situations in which n-gram paragraphs (in Experiments 1 and 2) or word pairs (Experiments 3 and 4) were learned . In the first experiment, participants rated improvement on a percentage scale, whereas on the second and third, judgments were given on a 0–6 scale. Experiment 4 used both a percentage scale and an absolute number scale. The main result was that judgments of improvement were poorly correlated with actual improvement and, in one case, were negatively correlated. Although judgments of improvement were correlated with changes in judgments of learning, they were not reliable indicators of actual improvement. Implications are discussed for theoretical work on metacognition.     

Separate Pathways for the Processing of Affordance of Neutral and Dangerous Object

Previous studies have shown that observation of object automatically elicits the activation of a reach-to-grasp response specifically directed to interact with the object, which is termed affordance. Recent findings provide evidences that even dangerous objects can evoke aversive affordances. However, these studies only focused on avoidance effect emerged with dangerous objects. It remains unclear whether the neutral object and dangerous object share a common mechanism for the processing of affordance information. The affordance effect is considered to be a type of conflict between the afforded response and the response required by the task. In a symbol judgment task, we simultaneously presented the neutral object and dangerous object to investigate whether the congruency sequence effects (congruency effects following incongruent trials are smaller than those following congruent trials) occurred across the two types of affordance conflict, which is typically assumed that such flexible adjustments can only be observed between the same conflict types. It was found that congruency sequence effects were only generated between the same types of affordance conflict (e.g., neutral object or dangerous object), but not between two different affordance conflict types (e.g., neutral object and dangerous object). These results indicate there may be two different pathways for the processing of affordance of the neutral and dangerous object.     

Judgments of associative memory

Judgments of associative memory (JAM) were indexed by ratings given to pairs of cue and response words. The normed probabilities, p(response|cue), were obtained from free association norms. The ratings were linearly related to the probabilities. The JAM functions were characterized by high intercepts ( approximately 50 on a 100 point scale) and shallow slopes (<0.5). The JAM function generalized across materials and method of rating. The function was not affected by expectancies or semantic similarity. Attempts to alter the function by making alternative responses more available were unsuccessful. A computer simulation model (MINERVA 2) exhibited the linear JAM function and successfully accounted for more complex phenomena (like the joint influence of forward and backward associative strengths on ratings). The shallow JAM slope appears to result from a fundamental lack of discrimination among associative strengths. The high intercept appears to result partly from an independent post-mnemonic source of bias producing over-estimation of association.     

Conflicting Judgments and Weakness of Will

Philosophia - This paper shows that our popular account of weakness of will is inconsistent with dilemmas. In dilemmas, agents judge that they ought to do one thing, that they ought to do something...     

Metacognitive Judgments and Control of Study

ABSTRACT— Recent evidence indicates that people's judgments of their own learning are causally related to their study behavior and not epiphenomenal. I argue here that people use these metacognitions in an effort to selectively study material in their own region of proximal learning. First they attempt to eliminate materials that are already well learned. Then they progress successively from studying easier to more difficult materials. Successful implementation of this metacognitively guided strategy enhances learning. The necessary components are, first, that the metacognitions be accurate, and second, that the appropriate choices are implemented for study. With these parts in place, the individual is in position to effectively take control of his or her own learning.