Scanning Behavior Research Articles

The time-course of visual scanning behaviour of paramedicine students upon arrival at a simulated emergency call

BackgroundLimited knowledge exists regarding how paramedics acquire an understanding of the scene they encounter upon arrival, despite their need to quickly gather information for effective clinical decision-making. This study examined visual scanning behaviour during the early stages of simulated emergency calls. MethodsEye movements of 10 paramedicine students were recorded during simulated calls conducted in both a high-fidelity classroom setting and a full sensory immersion setting. ResultsStudents focused on similar areas in both settings, with most time spent looking at the patient rather than distractors such as room features or other people. Analysis of gaze behaviour across the first five minutes revealed a more nuanced pattern: attention initially gravitated towards distractors but decreased as students became familiar with their surroundings and focused on the task at hand. This pattern was consistent across both simulation settings, indicating that information-seeking strategies may be independent of scene complexity. ConclusionsExpertise relies on the ability to differentiate between relevant and irrelevant information. Given the unpredictable nature of their work, paramedics must continuously adapt their understanding of a scene from the moment they enter it. Understanding how this skill develops may help identify expert strategies to inform training of novice paramedics.

Designing Greedy Algorithm for Cyber Threat Detection

As the digital landscape continues to expand, the complexity and frequency of cyber threats targeting critical information systems also increases. Effective cyber threat detection has become a paramount concern for safeguarding sensitive data and ensuring the uninterrupted operation of various infrastructures. This research introduces a novel approach to cyber threat detection through the design of a greedy algorithm tailored for identifying specific types of threats. The algorithm focuses on a simplified aspect of threat detection, aiming to highlight the potential of greedy algorithms in contributing to the broader field of cybersecurity. The methodology involves monitoring network traffic for signs of port scanning activity, a common precursor to potential cyber-attacks. The algorithm's effectiveness is evaluated in terms of its ability to accurately identify suspicious scanning behavior while minimizing false positives. By presenting this algorithmic framework, the research aims to contribute to the ongoing efforts in enhancing cyber threat detection techniques.

Resolving conflict between aversive and appetitive learning of views: how ants shift to a new route during navigation

Ants store and recall views associated with foraging success, facilitating future foraging journeys. Negative views are also learned, but instead prompt avoidance behaviors such as turning away. However, little is known about the aversive view’s role in navigation, the effect of cue conflict, or the contextual relationship between learning and recalling. In this study, we tested Myrmecia midas’ capacity for aversive learning of views either independently of or in conflict with appetitive events. We either captured and released foragers when reaching a location or let them pass unhindered. After a few journeys, captured foragers exhibited aversive learning by circumventing the capture location and increasing both meandering and scanning. Ants that experienced foraging-appetitive and homing-aversive events on their journeys exhibited lower rates of avoidance behavior and scans than those experiencing aversive events in both outbound and homebound journeys. The foraging-aversive and homing-aversive ants exhibited similar levels of avoidance and scanning as those that experienced the foraging-aversive and homing-appetitive. We found that foragers showed evidence of context specificity in their scanning behavior, but not in other measures of aversive learning. The foragers did not increase their meandering and scans while approaching the views associated with aversive events. In addition to shedding light on the role of aversive views in navigation, our finding has important implications for understanding the learning mechanisms triggered by handling animals.

Comprehensive analysis of thermal runaway and rupture of lithium-ion batteries under mechanical abuse conditions

Sidewall rupture of lithium-ion batteries plays an important role in thermal runaway (TR) propagation because flame burst from the side of cell can directly heat adjacent cells. However, the understanding of sidewall rupture in high specific energy cells under mechanical abuse conditions remains limited. In this work, nail penetration is adopted as a trigger method of TR of 21700-format cylindrical cells with high specific energy (257.0 W∙h/kg). The effects of test parameters including nail diameter, nail speed, penetrating location, penetrating depth, and state of charge on likelihood and severity of thermal runaway and sidewall rupture behaviour were investigated. A series of equipment including high-definition cameras, thermal imaging camera, X-ray computed tomography (CT), cycler and electronic balance were adopted to reveal the behaviour and the mechanism of TR and sidewall rupture. Discussion on CT scan and fire behaviour provides new perspectives for understanding sidewall rupture and TR mechanisms in high specific energy cells. The results show that the mean mass loss ratio of the cell with 100% SoC is greater than 45% under each test condition, and the maximum of them is as high as 62.5% when penetrating off-centre from the cell bottom and with a penetrating depth of 10 mm. The likelihood of sidewall rupture increases with the increasing nail speed, nail diameter, penetrating depth and state of charge when penetrating from the top cover of the cell, but it is little affected by the penetrating depth and nail diameter for penetrating from the bottom of the cell. For the first time such a relationship is presented. The root-cause analysis for the sidewall rupture of the cell has been discussed, which highlights the three key factors, including the casing strength, the internal pressure, and the opening area of the venting disk.

How overqualified teams motivate members to explore the external environment – the mediating role of change self-efficacy

PurposeMuch of the research on overqualification has focused on the negative effects at the individual level. However, in the face of the increasing tendency to recruit overqualified employees, managing the perception of team overqualification can be effective in motivating team members in the current complex and changing business environment.Design/methodology/approachBased on the person–environment fit theory, this study examines how team overqualification affects employees' change self-efficacy and how it further motivates employees to engage in strategic scanning behavior toward proactive external information gathering and analysis. The data collection for this study was divided into two stages, spaced three months apart. The analysis of questionnaire data from 290 employees and 72 supervisors confirmed the theoretical hypothesis of this study.FindingsWhen employees perceive a higher level of team overqualification, they will generate more strategic scanning behavior. And the change self-efficacy plays a mediating role between team overqualification and strategic scanning behavior and thus team members actively seek information from the external environment to develop future plans and work strategies. Meanwhile, transformational leadership positively moderates this process.Originality/valueFirstly, this study extends the positive manifestations of overqualification at the team level. Secondly, this study verifies that change self-efficacy mediates the relationship between team overqualification and strategic scanning, enriching the research on the antecedent and outcome variables of change self-efficacy. Finally, this study verified that the interaction effect of transformational leadership and team overqualification had an impact on employee strategic scanning behavior through change self-efficacy.

Acoustic behavior in the northern short-tailed shrew (Blarina brevicauda): Ultrasonic click production in a novel environment.

Although echolocation is classically associated with bats and dolphins, many animals produce ultrasonic and/or click-like signals to potentially navigate their environment. Shrews (Soricidae) are thought to rely on ultrasonic signals for echo-orientation, producing both ultrasonic click-like signals and tonal twittering signals. Recently, the role of ultrasonic clicks in shrew echo-orientation has been questioned, as these clicks have been proposed to be artifacts of shrews moving throughout their environment. By combining infrared video and ultrasonic audio recordings, we investigated the acoustic signals made by shrews (Blarina brevicauda) during different periods of locomotion. We hypothesized that if shrews are using ultrasonic vocalizations as a sensory mechanism, they will display head scanning behavior while emitting clicks that share key characteristics with other known echolocating animals. Our results show that B. brevicauda predominantly emit ultrasonic clicks rather than ultrasonic twittering calls while exploring a new environment, with clicks having the following characteristics: less than 120 μs in duration, median peak frequency of 26.9 kHz, and median bandwidth of 22.9 kHz. Across individuals we found no significant difference in peak frequency. Our results indicate that shrews emit ultrasonic clicks in novel environments which further supports the hypothesis of echo-orientation or echolocation in shrews.

Examination of eye movements during visual scanning of real-world images in Alzheimer's disease and amnestic mild cognitive impairment

Available evidence shows that Alzheimer's disease (AD) patients display inefficiencies in visual scanning of their surroundings, directing their attention towards non-relevant aspects of scenes. Not much is known about eye movements during visual scanning in individuals with amnestic mild cognitive impairment (aMCI). Notably, a consensus has yet to be reached on this issue. Furthermore, prior research has indicated the existence of visual attention deficits in individuals diagnosed with AD and aMCI. The objective of this study was to examine the visual scanning patterns of individuals diagnosed with AD, aMCI, and healthy controls (HC) when viewing various scenes. Thirty patients with AD, 32 aMCI, and 32 HC were included in the study. A set of 30 real-life scene images were presented to the participants in the visual scanning task. Participants' eye events were monitored using the EyeLink 1000 Plus in this task. The results indicate a significant reduction in total fixation duration, number of scanned areas, fixation counts, and saccade counts in AD as compared to those with aMCI and HC. The research did not reveal any significant statistical differences in eye parameters between the aMCI and HC groups. This study found abnormalities in visual scanning in AD compared to aMCI and HC. Visual scanning patterns of aMCI patients were not different from HC. Previous studies have specifically shown visual attention difficulties in AD and MCI. Our findings may be related to visual attention difficulties in AD. In addition, this study is the first to examine visual scanning behaviour with real-world images in AD and aMCI.

A MEMS Mirror-Based Confocal Laser Endomicroscope with Image Distortion Correction

Scanning MEMS mirrors can extend confocal laser microscopy into endoscopic applications, but the practical use of MEMS mirror-based confocal endomicroscopy is hindered partially by various image distortions such as barrel, fan-shaped and nonlinear distortions. In this work, the nonlinear scanning behaviors of an electrothermal MEMS mirror are analyzed and incorporated into an optical scanning model that takes all these three types of distortions into account. The model generates a 2D spatial mapping that can be applied to correct all of the image distortions in one step without a calibration board. To experimentally validate this method, a confocal laser endomicroscope employing a two-axis scanning electrothermal MEMS micromirror is designed and constructed, and confocal fluorescence images of a patterned micro-structure are obtained with the MEMS endomicroscope. The results show that the overall image distortion is reduced by at least one order of magnitude in the length direction.

Assessment of Terrestrial Laser Scanning (TLS) Behavior Against Material and Color for Short Range Applications

Assessment of Terrestrial Laser Scanning (TLS) Behavior Against Material and Color for Short Range Applications

Scanning behaviour in ants: an interplay between random-rate processes and oscillators

At the start of a journey home or to a foraging site, ants often stop, interrupting their forward movement, turn on the spot a number of times, and fixate in different directions. These scanning bouts are thought to provide visual information for choosing a path to travel. The temporal organization of such scanning bouts has implications about the neural organisation of navigational behaviour. We examined (1) the temporal distribution of the start of such scanning bouts and (2) the dynamics of saccadic body turns and fixations that compose a scanning bout in Australian desert ants, Melophorus bagoti, as they came out of a walled channel onto open field at the start of their homeward journey. Ants were caught when they neared their nest and displaced to different locations to start their journey home again. The observed parameters were mostly similar across familiar and unfamiliar locations. The turning angles of saccadic body turning to the right or left showed some stereotypy, with a peak just under 45°. The direction of such saccades appears to be determined by a slow oscillatory process as described in other insect species. In timing, however, both the distribution of inter-scanning-bout intervals and individual fixation durations showed exponential characteristics, the signature for a random-rate or Poisson process. Neurobiologically, therefore, there must be some process that switches behaviour (starting a scanning bout or ending a fixation) with equal probability at every moment in time. We discuss how chance events in the ant brain that occasionally reach a threshold for triggering such behaviours can generate the results.

Insect navigation: Where to face when moving through space

Ants perform oscillating scans of the environment during homing. A new study has shown that this scanning behaviour in ants is controlled by an intrinsic neuronal oscillator, which is modulated by both innate, and learnt visual cues.

Nano-apertures vs. nano-barriers: Surface scanning through obstacles and super-resolution in AFM-NSOM dual-mode

As part of the performance characterization of a combined and enhanced new AFM-NSOM tip-photo-detector, diffraction limitations were studied on two complementary samples: a nano-barrier embedded between two nano-apertures and one nano-aperture embedded between two nano-barriers. These consecutive multiple-obstacle scanning paths are part of this challenging specifications study of a new conical-shaped and drilled tip-photodetector, sharing a subwavelength aperture. A super-resolution algorithm feature was added in order to overcome possible obstacles, while scanning the same object with several small angles. The new multi-mode system includes scanning topography, optical imaging and an obstacle-overcoming algorithm. The present article study emphasizes the complexity of nano-scanning multiple-apertures/barriers. Both complementary analytical (Python) and numerical (Comsol) analyses are presented to forecast the expected scanning behavior and limitations. Moreover, in addition to a new concept of a combined AFM-NSOM drilled photo-sensor tip, several breakthroughs are presented in the algorithm itself: treatment of one unique pixel, angular scanning and reconstruction of sub-wavelength information. The uniqueness of the present study lies in its provision of a comprehensive solution to near field scanning: a paired hardware and software package solution.

Thermomechanical response of thermoplastic polyurethane used in MEX additive manufacturing over repetitive mechanical recycling courses

Sustainability is critical nowadays, with a growing interest in polymers, due to their increasing usage in products. Mechanical recycling of polymers involves grinding/shredding and thermal extrusion of the material. This is a thermomechanical process, which negatively affects the bulk mechanical performance of the polymer and may potentially introduce contamination. This work investigates the response of Thermoplastic Polyurethane (TPU) in material extrusion (MEX) 3D printing, after multiple recycling courses. Each course comprises two thermal cycles, one in the extruder for filament fabrication and a second one in the 3D printer's nozzle, for the manufacturing of the parts, following corresponding standards. The response of the material after up to six repetitions of the process was studied in this work. In each repetition, the effect of the process on the mechanical (tensile, flexural, impact, microhardness, Dynamic Mechanical Analysis), thermal (Thermogravimetric Analysis), morphological (Scanning Electron Microscopy), and structural (Micro X-Ray Computed Tomography Scanning & Analysis) behavior of the material was studied. The results of the study show a reasonable potential for the sustainability of the TPU material, exploiting 3D printing advantages. The highest tensile strength is reported in the sixth repetition of the thermal reprocessing of the material, indicating that TPU mechanical recycling is a viable option.

Women's behaviours towards cervical cancer screening in the COVID-19 pandemic: A moderated-mediation-model based on Information-Motivation-Behavioural Skills.

(1) To establish a predictive model based on the Information-Motivation-Behavioural Skills model, which can analyse the factors affecting the behaviours of women towards cervical cancer screening in the COVID-19 pandemic, and (2) to test the mediating effects of behavioural skills in the model, and (3) to test the moderated mediation effect of age. A cross-sectional study was conducted among 354 women aged 30-65 between May and August 2021 in Turkey. Data were collected by using an online survey. The direct and indirect effects were tested in the structural equation model and the moderated-mediation effect was tested in the PROCESS macro. Behavioural skills mediate the effect of motivation on cervical cancer screening behaviours. In addition, age has a moderated mediation effect on this mediation effect. Our study revealed that as women's motivation for cervical cancer screening increased, their behavioural skills also increased. It can be stated that middle-aged and older women with higher behavioural skills are more likely to have screening during the pandemic and to comply with national recommendations. This study is the first quantitative study to test the impact of the components of the Information-Motivation-Behavioural Skills model on cervical cancer screening during the COVID-19 pandemic. In addition, the results reveal the mediating effect of behavioural skills in the relationship between motivation and cervical cancer scanning behaviour and the moderated mediation effect of age. Our results can provide insight for nurses into how to triage women with delayed cervical cancer screening, how to build screening capacity, and how intervention strategies should be developed to improve compliance with cervical cancer screening and follow-up recommendations in women at risk during and after the pandemic.

Hazard perception performance and visual scanning behaviours: The effect of sleepiness

Driver sleepiness accounts for a substantial proportion of crashes in Australia and Worldwide. Young adults are overrepresented in sleep-related crashes and are more susceptible to sleepiness, resulting in impaired attention and driving performance. Visual scanning behaviour can affect the role between attention and information acquisition from the driver's environment. Thus, if attention is impaired, visual scanning behaviours are likely to show decrements as well. Overall, 32 young adults aged between 20 and 25 years completed a 60-minute hazard perception task to examine the effect of sleepiness and time-on-task on hazard perception performance, visual scanning behaviours, subjective sleepiness scores, and psychomotor vigilance test performance. The main outcomes include decrements in hazard perception performance and a restriction in horizontal and vertical eye scanning ranges across the 60-minute session, but with a more pronounced effect when sleep-restricted. These outcomes were consistent with increases in subjective sleepiness and behavioural metrics of sleepiness assessed via the PVT. Reductions in scanning range could limit opportunities to attend to hazards and other critical safety events. The current study outcomes provide an important contribution regarding the risks associated with sleepy driving performance.

Shared space: Different age groups’ perspectives

BackgroundShared spaces, in the context of road transport, often refer to areas shared by unprotected and protected road users and intended to facilitate a living city space for every-one. A basic idea behind shared spaces is to create traffic safety by inducing some uncertainty. This study investigates how young, middle-aged, and elderly pedestrians experience shared space, as well as whether and, if so, how two shared space designs (without and with large flowerpots) affect this experience. MethodThirty-seven participants, divided into three age groups, participated in the study, conducted in Fisherman’s Square, Västervik, Sweden. An adjacent non-signal-regulated pedestrian crossing was used as a control. Two studies – visual scanning and Q studies – were combined. In the visual scanning study, eye-tracking examined how the two designs affected the participants’ visual scanning behaviour (i.e., what participants looked at) as pedestrians. In the Q-study, Q-methodology was used to examine how the two designs affected the participants’ experiences as pedestrians. ResultsThe visual scanning study showed that different age groups were affected in different ways by designs without and with large flowerpots in the shared space. While the middle-aged participants always glanced more often at traffic-relevant objects, and young participants always glanced equally often at traffic-relevant and non-traffic-relevant objects, the elderly participants changed their visual scanning behaviour depending on the design. Without large flowerpots deployed, the elderly participants glanced more often at traffic-relevant than non-traffic-relevant objects. No such difference was obtained when large flowerpots were deployed. The Q-study showed that participants, regardless of age, experienced no great uncertainty in this shared space. The perceived uncertainty, which nevertheless existed, was reduced with large flowerpots deployed to recreate the traditional division with clear zones where pedestrians could stay in relatively car-free areas while motor vehicles had clear paths to travel along. ConclusionThe results suggest that shared space, without large flowerpots, succeeded in inducing some uncertainty, especially among middle-aged and elderly pedestrians. However, deploying large flowerpots seemed to decrease this uncertainty, especially among elderly pedestrians. The major concern prompted by these results is how this decreased uncertainty affects traffic safety. Shared space also needs to be studied from the car driver’s perspective to understand the interaction between different road user groups.

Validation of a system for automatic quantitative analysis of laboratory mice behavior based on locomotor pose

Automatic recognition and accurate quantitative analysis of rodent behavior play an important role in brain neuroscience, pharmacological and toxicological. Currently, most behavior recognition systems used in experiments mainly focus on the indirect measurements of animal movement trajectories, while neglecting the changes of animal body pose that can indicate more psychological factors. Thus, this paper developed and validated an hourglass network-based behavioral quantification system (HNBQ), which uses a combination of body pose and movement parameters to quantify the activity of mice in an enclosed experimental chamber. In addition, The HNBQ was employed to record behavioral abnormalities of head scanning in the presence of food gradients in open field test (OFT). The results proved that the HNBQ in the new object recognition (NOR) experiment was highly correlated with the scores of manual observers during the latent exploration period and the cumulative exploration time. Moreover, in the OFT, HNBQ was able to capture the subtle differences in head scanning behavior of mice in the gradient experimental groups. Satisfactory results support that the combination of body pose and motor parameters can regard as a new alternative approach for quantification of animal behavior in laboratory.

Attention for Emotion-How Young Adults With Neurodevelopmental Disorders Look at Facial Expressions of Affect.

While Autism Spectrum Disorder (ASD), Attention-Deficit/Hyperactivity Disorder (ADHD) and Schizophrenia (SCZ) differ in many clinically relevant features such as symptomatology and course, they may also share genetic underpinnings, affective problems, deviancies in social interactions, and are all characterized by some kind of cognitive impairment. This situation calls for a joint investigation of the specifics of cognitive (dys-)functions of the three disorders. Such endeavor should focus, among other domains, on the inter-section of processing cognitive, affective and social information that is crucial in effective real-life interactions and can be accomplished when attentional preferences for human facial expressions of emotions is studied. To that end, attention to facial expressions of basic emotions was examined in young adults with ASD, ADHD, or SCZ in the present study. The three clinical groups were compared with an age-matched group of typically-developing participants (TD) during the free contemplation of five different facial emotions presented simultaneously, by varying identities, through the registration of eye movements. We showed, that dwell times and fixation counts differed for the different emotions in TD and in a highly similar way in ADHD. Patients with ASD differed from TD by showing a stronger differentiation between emotions and partially different attentional preferences. In contrast, the SCZ group showed an overall more restricted scanning behavior and a lack of differentiation between emotions. The ADHD group, showed an emotion-specific gazing pattern that was highly similar to that of controls. Thus, by analyzing eye movements, we were able to differentiate three different viewing patterns that allowed us to distinguish between the three clinical groups. This outcome suggests that attention for emotion may not tap into common pathophysiological processes and argues for a multi-dimensional approach to the grouping of disorders with neurodevelopmental etiology.

Applying the comprehensive model of information seeking to understand chronic illness information scanning: Hong Kong evidence

AbstractChronic illness is the most prevalent and costly global public health challenge. To address this challenge, health information is essential for individuals to make informed decisions to self‐manage their health and prevent and monitor chronic illness. Although previous studies show that health information scanning—a form of information gathering behavior to obtain health information, incidentally, when health topics of interest arise during daily conversations with others or through regular use of the media—positively influenced health decisions, little is known about information scanning in the context of chronic illness. This study applied the Comprehensive Model of Information Seeking to examine factors that influence individuals' use of different channels for health information scanning. Using quota sampling to resemble population demographic characteristics, we collected 1100 online survey responses from Chinese‐speaking Hong Kong residents aged from 18 to 65 or older. Three structural equation modeling analyses were performed to examine how antecedent factors and information carrier factors influenced the use of interpersonal/group channels, the Internet‐related channels, and the traditional media channels for scanning chronic illness‐related information. The findings supported that channel utility was an important determinant of health scanning behavior, and channel characteristics were strong predictors of channel utility. However, mixed findings were observed on the relationship between antecedent factors and channel utility across the three‐channel categories, because some antecedent factors had direct influence on health information scanning. These findings will inform the information dissemination and promotional message design for chronic illness prevention and care.

Analysis of Attention, Processing, and Visual Search in Adults With Traumatic Brain Injury: A Preliminary Study

Purpose: Some adults with underlying cognitive and visual deficits following traumatic brain injury (TBI) have difficulty locating items in visuographic materials. Given that many external supports depict content through multiple modalities, understanding how individuals with cognitive or visual deficits interpret content is crucial for designing and selecting supports. The purpose of this exploratory study was to evaluate the scanning, attention, and processing behaviors of adults with TBI during visual searches. Method: Participants included nine adults with TBI and nine controls. Participants viewed 24 grid (5 × 5) displays on an eye tracker under two conditions (i.e., text and icons) and located target items. Results: Participants collectively exhibited more difficulty scanning for and processing iconic stimuli than text stimuli. More efficient searches increased the likelihood of a successful search, regardless of condition. Conclusions: These findings have implications for clinicians and researchers who evaluate, select, and create visuographic supports. Layouts should be individualized to the person's strengths and challenges in visual search. Direct instructions should be provided to adults with TBI to increase their ability to successfully search and use visuographic supports. Further research will help elucidate whether the presentation of content in different layouts or representing various word classes (e.g., adjectives and verbs) prompts additional scanning and processing challenges.