Detection of Icon Appearance and Disappearance on a Digital Situation Awareness Display

The potential for change detection failure during the monitoring of a military digital situation awareness map was investigated. Participants were asked to monitor the map for icon appearance or disappearance. A change accompanied by two other changes was detected 69.3% of the time, while the same change occurring alone was detected 79.6% of the time. When three changes occurred simultaneously, all three were detected only 37% of the time. Detection of icon appearance was superior to detection of icon disappearance, as might be expected from the literature on visual attention. The discussion addresses the need to represent change explicitly in such systems and suggests properties that a change detection aid should possess.     

图标形象度影响早期识别进程: 来自ERP的证据

人们主观上认为形象图标容易识别,然而以反应时为指标的行为实验发现,随着熟悉度增加,形 象优势逐渐消失。本研究采用事件相关电位(ERPs)技术,记录分析了 17 名熟练用户在识别图标时的识别电 位(RP)。结果显示:图标形象度对 RP 在潜伏期无显著差异,但形象图标反应时比抽象图标短,且形象图标 的RP波幅显著小于抽象图标。这一结果说明识别形象图标在类别分拣进程中处理的特征信息量较抽象图标少。     

Visual marking and visual change

Five experiments investigated the types of changes that disrupt the preview effect--the benefit gained in difficult search tasks from presenting some distractors earlier in time. A shape change with or without an overall luminance change at the location of an old item was found to disrupt the preview effect, whereas an equivalent luminance change alone or an isoluminant color change was not disruptive. Results suggest that (a) relatively low-level visual changes may not be sufficient to abolish the benefit, (b) the benefit most likely occurs through inhibition applied to locations within a location master map, and (c) inhibition need not be applied to surface features of objects.     

Similarity chains in the transformational paradigm

Rips’ (1989) results with the transformational paradigm have often been cited as supporting accounts of categorisation not based on similarity, such as involving necessary or sufficient features (or a belief in such features), which guarantee a categorisation outcome once their presence has been established. We discuss a similarity account of the transformational paradigm based on similarity chains, which predicts that when the transformation is more gradual the identity of the transformed object is less likely to change. Conversely, we suggest that an essentialist approach to categorisation predicts that essences are more likely to change in gradual transformations, across generations, as is the case with evolutionary change of species. In two experiments we examined the scope of the similarity versus the essentialist account in the transformational paradigm. With space aliens, the similarity account was superior to the essentialist one, but the converse was true with earth creatures. We suggest that an essentialist mode of categorisation is more likely than a similarity one for stimuli that are in better correspondence with our naïve understanding of the world.     

时间压力下图标语义距离对雷达界面信息工作记忆的影响

本研究分别在无时间压力和有时间压力的条件下,通过两个实验探究了图标语义距离?目标数量以及目标类型对雷达界面信息工作记忆的影响?结果发现无时间压力下图标语义距离在工作记忆的编码提取上没有差异,而有时间压力下,强语义图标相较于弱语义图标在工作记忆的提取上具有优势;且无论是在无时间压力下还是有时间压力下,工作记忆容量最佳为3个目标项;对敌机的提取时长于友机长于不明飞行物?结果表明仅在有时间压力下强语义图标在信息提取上具有优势,验证了工作记忆容量的限制,为雷达界面的设计提供了参考意见?     

Errors and error detection in typing

The errors and error detections made by qualified and trainee typists were examined, when they were given a passage of prose that included pseudo-words and words made up of random consonants. It was shown that trainees make more and detect relatively fewer errors. For all typists errors are made more often per letter in long or degraded words and are relatively less likely to be detected.     

Searching for signs, symbols, and icons: effects of time of day, visual complexity, and grouping

Searching for icons, symbols, or signs is an integral part of tasks involving computer or radar displays, head-up displays in aircraft, or attending to road traffic signs. Icons therefore need to be designed to optimize search times, taking into account the factors likely to slow down visual search. Three factors likely to adversely affect visual search were examined: the time of day at which search was carried out, the visual complexity of the icons, and the extent to which information features in the icon were grouped together. The speed with which participants searched icon arrays for a target was slower early in the afternoon, when icons were visually complex and when information features in icons were not grouped together to form a single object. Theories of attention that account for both feature-based and object-based search best explain these findings and are used to form the basis for ways of improving icon design.     

The Influence of Skills,Message Frame,and Visual Aids on Prevention of Sexually Transmitted Diseases

In a large three week longitudinal study, we investigated the efficacy of framed messages for promoting condom use in sexually active young adults. We also investigated the influence of key risk literacy skills (i.e., numeracy and graph literacy) and visual aids (i.e., icon arrays) on the efficacy of framed messages. Finally, we investigated the underlying psychological mechanisms of behavioral change on the ability of icon arrays to improve message effectiveness. Results showed that framed messages including icon arrays increased adherence to self‐reported condom use by giving rise to enduring changes in attitudes and behavioral intentions, which influenced behavior. Icon arrays were found to be most beneficial among young adults with relatively low numeracy as long as they had high graph literacy. These findings build on the previous research in risk communication and extend psychological theories of health‐related decision making such as the theory of planned behavior. These findings also map the conditions under which well‐constructed visual aids can be among the most effective, transparent, and ethically desirable means of risk communication. Implications for risk communication and informed medical decision making are discussed. Copyright © 2013 John Wiley & Sons, Ltd.     

Probability as a psychological distance: Construal and preferences

We argue that probability, like space and time, instantiates psychological distance. Unlikely outcomes may seem more remote than likely outcomes and may therefore be construed at a relatively high level. Specifically, when the probability of an outcome is low, ends-related primary features should be more salient than means-related secondary features, but as the probability of the outcome increases, means-related features may become no less and even more salient than ends-related features. Thus, increases in probability should increase the weight of means-related features relative to the weight of ends-related features in decisions, thereby decreasing (or even reversing) the preference for a more desirable/less feasible outcome over a less desirable/more feasible outcome. We observed this pattern in two experiments. Analyses of judgments, monetary decisions, and self-reported reasons for decisions showed that the weight of means-related features was more sensitive to changes in probability than the weight of ends-related features in decisions.     

Critical reading of words and phrases in aphasia

To assess ability to read critically at the word and phrase level, four tests were administered to aphasic patients blocked on site of lesion and severity of auditory comprehension defect. Overall, site of lesion did not affect the quantitative scores or the patterns of errors in the four tests; this result suggests that there is a fixed order of difficulty in reading comprehension irrespective of the locus of the aphasic deficit. In contrast, profiles of performance differed significantly, depending on severity of comprehension difficulty. Patients with significant comprehension defect proved relatively superior at recognizing misspelled words; relatively poor at matching written nouns with their depicted referents; less likely to display improved comprehension when an additional substantive was included in a written phrase; relatively better at recognizing which words were the same parts of speech than at recognizing which words share salient semantic features; and relatively better at matching words which belonged together than at choosing the word which does not belong to a set. Taken together, the results suggest that strategies of reading may change in the presence of a severe aphasia, with such impaired patients relying less on semantic considerations and consequently more on orthographic information and on the distributional and sequential properties of words in sentences.     

The use of Afrocentric features as cues for judgment in the presence of diagnostic information

Prior research has shown that within racial category, group members with more Afrocentric facial features are presumed to have more stereotypic traits than those with less Afrocentric features. The present experiment investigated whether this form of feature‐based stereotyping occurs when more diagnostic information is available. The participants were provided with photographs and information about the aggressive (or non‐aggressive) behaviour of 64 African Americans in four different situations, and asked to predict the likelihood of aggression in a fifth situation. As expected, each instance of aggression increased estimates that a target would behave aggressively in the unknown situation. With degree of displayed aggression controlled, however, targets with more Afrocentric features were judged as significantly more likely to behave aggressively than targets with less Afrocentric features. Thus, stereotyping based on Afrocentric features occurs even when other obviously‐relevant information is available. This suggests that it may be difficult to detect and avoid. Copyright © 2004 John Wiley & Sons, Ltd.     

Icon flickering, flicker rate, and color combinations of an icon's symbol/background in visual search performance

The effects of color combinations of an icon's symbol/background and components of flicker and flicker rate on visual search performance on a liquid crystal display screen were investigated with 39 subjects who searched for a target icon in a circular stimulus array (diameter = 20 cm) including one target and 19 distractors. Analysis showed that the icon's symbol/background color significantly affected search time. The search times for icons with black/red and white/blue were significantly shorter than for white/yellow, black/yellow, and black/blue. Flickering of different components of the icon significantly affected the search time. Search time for an icon's border flickering was shorter than for an icon symbol flickering; search for flicker rates of 3 and 5 Hz was shorter than that for 1 Hz. For icon's symbol/background color combinations, search error rate for black/blue was greater than for black/red and white/blue combinations, and the error rate for an icon's border flickering was lower than for an icon's symbol flickering. Interactions affected search time and error rate. Results are applicable to design of graphic user interfaces.     

Sex differences during visual scanning of occlusion events in infants

A growing number of sex differences in infancy have been reported. One task on which they have been observed reliably is the event-mapping task. In event mapping, infants view an occlusion event involving 1 or 2 objects, the occluder is removed, and then infants see 1 object. Typically, boys are more likely than girls to detect an inconsistency between a 2-object occlusion event and a 1-object display. The current research investigated underlying reasons for this sex difference. Three eye-tracking experiments were conducted with infants at 9 and 4 months (mean age). Infants saw a ball-box or ball-ball occlusion event followed by a 1-ball display; visual scanning of the occlusion event and the 1-ball display was recorded. Older boys were more likely than older girls to visually track the objects through occlusion and more likely to detect an inconsistency between the ball-box event and the 1-ball display. In addition, tracking objects through occlusion was related to infants' scanning of the 1-ball display. Both younger boys and girls failed to track the objects through occlusion and to detect an inconsistency between the ball-box event and the 1-ball display. These results suggest that infants' capacity to track objects through occlusion facilitates extraction of the structure of the initial event (i.e., the number of distinct objects involved) that infants can map onto the final display and that sex differences in the capacity emerge between 4 and 9 months. Possible explanations for how the structure of an occlusion event is extracted and mapped are considered.     

Sad people avoid the eyes or happy people focus on the eyes? Mood induction affects facial feature discrimination

Depressed people tend to avoid eye-contact in social situations and in experimental settings, whereas happy people actively seek eye-contact. We report an experiment in which participants made discriminations between faces that had either configural or featural changes made to the eyes, nose, or head shape. The results showed participants induced to be happy detected changes in eyes more often than participants induced to be sad, but failed to detect changes in other facial features. Sad-induced participants detected changes to the head shape but not the eyes. The results are interpreted in terms of differential use of features attended to by happy and sad participants, whereby happy people are more likely to attend to eyes during face perception than sad people.     

How Children Learn the Ins and Outs: A Training Study of Toddlers' Categorization of Animals

Young children are able to categorize animals on the basis of unobservable features such as shared biological properties (e.g., bones). For the most part, children learn about these properties through explicit verbalizations from others. The present study examined how such input impacts children's learning about the properties of categories. In a training study with thirty-six 2.5-year-olds (M_age = 2;9), we tested the prediction that a relatively small amount of input highlighting the importance of unobservable properties would lead to a gradual shift in children's use of these properties for categorization. Children with no initial categorization bias were trained to categorize either on the basis of shared unobservable properties or shared observable properties. During 3 days of training, children gradually developed a categorization bias in the direction of the property type for which they received training and sustained this bias more than a week after training. Also, a set of children who exhibited an initial perceptual bias showed an abrupt change in how they categorized after only 1 training session.     

Autobiographical memories for the September 11th attacks: Reconstructive errors and emotional impairment of memory

College students were asked about their personal memories from September 11, 2001. Consistency in reported features over a 2-month period increased as the delay between the initial test and 9/11 increased. Central features (e.g., Where were you?) were reported with greater consistency than were peripheral features (What were you wearing?) but also contained a larger proportion of reconstructive errors. In addition, highly emotional participants demonstrated poor prospective memory and relatively inconsistent memory for peripheral details, when compared with less emotional participants. Highly emotional participants were also more likely to increase the specificity of their responses over time but did not exhibit greater consistency for central details than did less emotional participants. The results demonstrated reconstructive processes in the memory for a highly consequential and emotional event and emotional impairment of memory processing of incidental details.     

Undetected changes in visible stimuli influence subsequent decisions

Change blindness-our inability to detect changes in a stimulus-occurs even when the change takes place gradually, without any disruption [Simons, D. J., Franconeri, S. L., & Reimer, R. L. (2000). Change blindness in the absence of a visual disruption. Perception, 29(10), 1143-1154]. Such gradual changes are more difficult to detect than changes that involve a disruption. Using this method, David et al. [David, E., Laloyaux, C., Devue, C., & Cleeremans, A. (in press). Change blindness to gradual changes in facial expressions. Psychologica Belgica] recently showed substantial blindness to changes that involve facial expressions of emotion. In this experiment, we show that people who failed to detect any change in the displays were (1) nevertheless influenced by the changing information in subsequent recognition decisions about which facial expression they had seen, and (2) that their confidence in their decisions was lower after exposure to changing vs. static displays. The findings therefore support the notion that undetected changes that occur in highly salient stimuli may be causally efficacious and influence subsequent behavior. Implications concerning the nature of the representations associated with undetected changes are discussed.     

Acoustic factors in visual search

Previous work has shown that in searching for existing or absent “e.s” in printed prose, the presence or absence of silent “e.s” was less likely to be detected than that of pronounced “e.s.” It was suggested that the acoustic or kinaesthetic “image” was searched for evidence of an “e” in addition to the visual stimulus and that evidence from both sources was considered in making the appropriate response.

The present experiment employs mainly substitutive errors within words, which may or may not change their pronunciation. The results suggest that the form of the acoustic correlates has no bearing upon whether the words are detected as wrongly spelt, but that the presence or absence of an acoustic event corresponding in time to the spatial location of the error is important.     

Two Trajectories of Depressive Symptom Reduction Throughout Behavioral Activation Teletherapy Among Underserved,Ethnically Diverse,Primary Care Patients: A VitalSign6 Report

While prior research has investigated trajectories of depressive symptom change throughout psychotherapy, such work has not been conducted exclusively among underserved patients receiving brief Behavioral Activation (BA) teletherapy, intervention modifications that should reduce barriers to therapy initiation and engagement. The current project used cluster analysis to determine discrete groups of symptom change among patients receiving an 8-session BA teletherapy intervention, and analyzed whether demographic and clinical characteristics were associated with group membership. Data from 105 patients referred from charity primary care clinics and receiving at least two therapy sessions were analyzed. Patients were predominantly female and Latina. The 9-item Patient Health Questionnaire (PHQ-9) was the outcome. Two categories were determined: a larger group (N = 61) demonstrating initially less severe symptoms and experiencing a gradual recovery, and a smaller group beginning with more severe symptoms, and experiencing a steeper recovery. In both groups, a majority of participants experienced at least a 5-point drop in depressive symptoms, while in the latter group, a majority of patients achieved depressive symptom remission (PHQ-9 < 5). Monolingual Spanish speakers were more likely to be in the former group, but no other demographic or clinical characteristics were associated with group membership. In both groups, a majority of the symptom reduction occurred by sessions 4–6. Therefore, two categories of depressive symptom change, slow responders and rapid responders, occur among patients receiving a brief BA teletherapy intervention. No demographic differences aside from primary language, nor any clinical characteristics, distinguish group membership, suggesting similar patterns of symptom reduction among a primarily underserved sample.     

Object property encoding and change blindness in multiple object tracking

The paradigm of multiple object tracking (MOT) is an established tool for investigating human performance under conditions of divided attention to several objects. We studied change detection ability for colour and shape information in the setting of MOT. Subjects had to detect colour and shape changes during an MOT task. These changes occurred either openly (with nothing to hide them) or with a mud splash in the background to hide the change transient signal. Our experiment demonstrated that (1) when hidden by mud splashes, we fail to perceive a considerable number of colour changes even in the attended objects (i.e., targets) and (2) the visual system is significantly more likely to miss colour and shape changes in distractors than in target. We conclude that a colour change will be detected a lot more efficiently if attention is drawn to its transient. When a simultaneous mud splash hides the transient signal, subjects are significantly less efficient in detecting the change.