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ENeuro Jun 2024In measurement, a reference frame is needed to compare the measured object to something already known. This raises the neuroscientific question of which reference frame...
In measurement, a reference frame is needed to compare the measured object to something already known. This raises the neuroscientific question of which reference frame is used by humans when exploring the environment. Previous studies suggested that, in touch, the body employed as measuring tool also serves as reference frame. Indeed, an artificial modification of the perceived dimensions of the body changes the tactile perception of external object dimensions. However, it is unknown if such a change in tactile perception would occur when the body schema is modified through the illusion of owning a limb altered in size. Therefore, employing a virtual hand illusion paradigm with an elongated forearm of different lengths, we systematically tested the subjective perception of distance between two points [tactile distance perception (TDP) task] on the corresponding real forearm following the illusion. Thus, the TDP task is used as a proxy to gauge changes in the body schema. Embodiment of the virtual arm was found significantly greater after the synchronous visuotactile stimulation condition compared with the asynchronous one, and the forearm elongation significantly increased the TDP. However, we did not find any link between the visuotactile-induced ownership over the elongated arm and TDP variation, suggesting that vision plays the main role in the modification of the body schema. Additionally, significant effect of elongation found on TDP but not on proprioception suggests that these are affected differently by body schema modifications. These findings confirm the body schema malleability and its role as a reference frame in touch.
Topics: Humans; Female; Male; Virtual Reality; Touch Perception; Young Adult; Adult; Illusions; Distance Perception; Proprioception; Body Image; Forearm
PubMed: 38844346
DOI: 10.1523/ENEURO.0244-23.2024 -
Journal of Vision Jun 2024Ensemble processing allows the visual system to condense visual information into useful summary statistics (e.g., average size), thereby overcoming capacity limitations... (Comparative Study)
Comparative Study
Ensemble processing allows the visual system to condense visual information into useful summary statistics (e.g., average size), thereby overcoming capacity limitations to visual working memory and attention. To examine the role of attention in ensemble processing, we conducted three experiments using a novel paradigm that merged the action effect (a manipulation of attention) and ensemble processing. Participants were instructed to make a simple action if the feature of a cue word corresponded to a subsequent shape. Immediately after, they were shown an ensemble display of eight ovals of varying sizes and were asked to report either the average size of all ovals or the size of a single oval from the set. In Experiments 1 and 2, participants were cued with a task-relevant feature, and in Experiment 3, participants were cued with a task-irrelevant feature. Overall, the task-relevant cues that elicited an action influenced reports of average size in the ensemble phase more than the cues that were passively viewed, whereas task-irrelevant cues did not bias the reports of average size. The results of this study suggest that attention influences ensemble processing only when it is directed toward a task-relevant feature.
Topics: Humans; Attention; Cues; Young Adult; Male; Female; Photic Stimulation; Adult; Memory, Short-Term; Reaction Time; Size Perception; Form Perception; Psychomotor Performance; Pattern Recognition, Visual
PubMed: 38842835
DOI: 10.1167/jov.24.6.5 -
Journal of Vision Jun 2024The primary symptom of visual snow syndrome (VSS) is the unremitting perception of small, flickering dots covering the visual field. VSS is a serious but poorly...
The primary symptom of visual snow syndrome (VSS) is the unremitting perception of small, flickering dots covering the visual field. VSS is a serious but poorly understood condition that can interfere with daily tasks. Several studies have provided qualitative data about the appearance of visual snow, but methods to quantify the symptom are lacking. Here, we developed a task in which participants with VSS adjusted parameters of simulated visual snow on a computer monitor until the simulation matched their internal visual snow. On each trial, participants (n = 31 with VSS) modified the size, density, update speed, and contrast of the simulation. Participants' settings were highly reliable across trials (intraclass correlation coefficients > 0.89), and they reported that the task was effective at stimulating their visual snow. On average, visual snow was very small (less than 2 arcmin in diameter), updated quickly (mean temporal frequency = 18.2 Hz), had low density (mean snow elements vs. background = 2.87%), and had low contrast (average root mean square contrast = 2.56%). Our task provided a quantitative assessment of visual snow percepts, which may help individuals with VSS communicate their experience to others, facilitate assessment of treatment efficacy, and further our understanding of the trajectory of symptoms, as well as the neural origins of VSS.
Topics: Humans; Adult; Male; Female; Visual Fields; Young Adult; Photic Stimulation; Middle Aged; Contrast Sensitivity; Perceptual Disorders; Visual Perception; Computer Simulation; Vision Disorders
PubMed: 38837169
DOI: 10.1167/jov.24.6.3 -
Human Vaccines & Immunotherapeutics Dec 2024To determine the influencing factors of Chinese parents' intention and behavior for children to receive live attenuated influenza vaccine during the 2022-2023 influenza...
To determine the influencing factors of Chinese parents' intention and behavior for children to receive live attenuated influenza vaccine during the 2022-2023 influenza season. A theoretical model was developed and included seven constructs, and structural equation modeling was used to test 11 hypotheses. From October 2022 to December 2023, a survey was conducted across 38 medical institutions in four Chinese cities and their subordinate districts, counties, and rural areas. Parents who accompanied their children for vaccinations were selected through a randomization process based on their child's medical card numbers. Measures were taken to minimize method bias, including a diverse geographical representation and random sampling. The survey resulted in the collection of 936 valid responses, exceeding the recommended sample size for structural equation model analysis and providing robust statistical inferences. During the study period, 936 respondents were included in the study. Perceived ease of use was verified to be a predictor of perceived usefulness and perceived value. Perceived usefulness was verified as a predictor of perceived value and behavioral intention. Knowledge was a significant antecedent of perceived value and risk perception of influenza disease. Risk perception of influenza disease was proved to be a significant predictor of perceived value and self-reported vaccination behavior. Perceived value significantly affected behavioral intention, and behavioral intention significantly affected self-reported vaccination behavior. Six demographic variables significantly moderate the theoretical models. The low vaccination coverage of live attenuated influenza vaccine (LAIV) among children in China suggests a need for a deeper understanding of the factors that influence vaccination rates. Particularly, effective strategies are necessary from policymakers and practitioners to elevate childhood LAIV coverage.
Topics: Humans; Influenza Vaccines; Influenza, Human; Parents; Female; Male; Vaccines, Attenuated; China; Adult; Health Knowledge, Attitudes, Practice; Patient Acceptance of Health Care; Child; Vaccination; Surveys and Questionnaires; Middle Aged; Child, Preschool; Young Adult; Intention; Vaccination Coverage
PubMed: 38835204
DOI: 10.1080/21645515.2024.2356343 -
Journal of Vision Jun 2024The spectral locus of unique yellow was determined for flashes of different sizes (<11 arcmin) and durations (<500 ms) presented in and near the fovea. An adaptive...
The spectral locus of unique yellow was determined for flashes of different sizes (<11 arcmin) and durations (<500 ms) presented in and near the fovea. An adaptive optics scanning laser ophthalmoscope was used to minimize the effects of higher-order aberrations during simultaneous stimulus delivery and retinal imaging. In certain subjects, parafoveal cones were classified as L, M, or S, which permitted the comparison of unique yellow measurements with variations in local L/M ratios within and between observers. Unique yellow shifted to longer wavelengths as stimulus size or duration was reduced. This effect is most pronounced for changes in size and more apparent in the fovea than in the parafovea. The observed variations in unique yellow are not entirely predicted from variations in L/M ratio and therefore implicate neural processes beyond photoreception.
Topics: Humans; Photic Stimulation; Retinal Cone Photoreceptor Cells; Fovea Centralis; Color Perception; Retina; Adult; Ophthalmoscopy
PubMed: 38833255
DOI: 10.1167/jov.24.6.2 -
Frontiers in Neurorobotics 2024During the last few years, a heightened interest has been shown in classifying scene images depicting diverse robotic environments. The surge in interest can be...
INTRODUCTION
During the last few years, a heightened interest has been shown in classifying scene images depicting diverse robotic environments. The surge in interest can be attributed to significant improvements in visual sensor technology, which has enhanced image analysis capabilities.
METHODS
Advances in vision technology have a major impact on the areas of multiple object detection and scene understanding. These tasks are an integral part of a variety of technologies, including integrating scenes in augmented reality, facilitating robot navigation, enabling autonomous driving systems, and improving applications in tourist information. Despite significant strides in visual interpretation, numerous challenges persist, encompassing semantic understanding, occlusion, orientation, insufficient availability of labeled data, uneven illumination including shadows and lighting, variation in direction, and object size and changing background. To overcome these challenges, we proposed an innovative scene recognition framework, which proved to be highly effective and yielded remarkable results. First, we perform preprocessing using kernel convolution on scene data. Second, we perform semantic segmentation using UNet segmentation. Then, we extract features from these segmented data using discrete wavelet transform (DWT), Sobel and Laplacian, and textual (local binary pattern analysis). To recognize the object, we have used deep belief network and then find the object-to-object relation. Finally, AlexNet is used to assign the relevant labels to the scene based on recognized objects in the image.
RESULTS
The performance of the proposed system was validated using three standard datasets: PASCALVOC-12, Cityscapes, and Caltech 101. The accuracy attained on the PASCALVOC-12 dataset exceeds 96% while achieving a rate of 95.90% on the Cityscapes dataset.
DISCUSSION
Furthermore, the model demonstrates a commendable accuracy of 92.2% on the Caltech 101 dataset. This model showcases noteworthy advancements beyond the capabilities of current models.
PubMed: 38831877
DOI: 10.3389/fnbot.2024.1398703 -
Trends in Hearing 2024The extent to which active noise cancelation (ANC), when combined with hearing assistance, can improve speech intelligibility in noise is not well understood. One...
The extent to which active noise cancelation (ANC), when combined with hearing assistance, can improve speech intelligibility in noise is not well understood. One possible source of benefit is ANC's ability to reduce the sound level of the direct (i.e., vent-transmitted) path. This reduction lowers the "floor" imposed by the direct path, thereby allowing any increases to the signal-to-noise ratio (SNR) created in the amplified path to be "realized" at the eardrum. Here we used a modeling approach to estimate this benefit. We compared pairs of simulated hearing aids that differ only in terms of their ability to provide ANC and computed intelligibility metrics on their outputs. The difference in metric scores between simulated devices is termed the "ANC Benefit." These simulations show that ANC Benefit increases as (1) the environmental sound level increases, (2) the ability of the hearing aid to improve SNR increases, (3) the strength of the ANC increases, and (4) the hearing loss severity decreases. The predicted size of the ANC Benefit can be substantial. For a moderate hearing loss, the model predicts improvement in intelligibility metrics of >30% when environments are moderately loud (>70 dB SPL) and devices are moderately capable of increasing SNR (by >4 dB). It appears that ANC can be a critical ingredient in hearing devices that attempt to improve SNR in loud environments. ANC will become more and more important as advanced SNR-improving algorithms (e.g., artificial intelligence speech enhancement) are included in hearing devices.
Topics: Humans; Hearing Aids; Signal-To-Noise Ratio; Speech Intelligibility; Noise; Perceptual Masking; Speech Perception; Computer Simulation; Acoustic Stimulation; Correction of Hearing Impairment; Persons With Hearing Impairments; Hearing Loss; Equipment Design; Signal Processing, Computer-Assisted
PubMed: 38831646
DOI: 10.1177/23312165241260029 -
Journal of Family Medicine and Primary... Apr 2024Menopause is an inevitable phase in every woman's life. Women may suffer from unpleasant symptoms during perimenopause. Understanding the health needs of the community...
UNLABELLED
Menopause is an inevitable phase in every woman's life. Women may suffer from unpleasant symptoms during perimenopause. Understanding the health needs of the community during this period will help in developing menopause management programs that can improve quality of life.
AIM
To study the symptoms of menopause and perception of women in relation to menopause in order to understand their needs.
SETTINGS AND DESIGN
A cross-sectional, multi-centric study was undertaken at three institutions (called DH, SJ, and SK) at two cities in India. The study population comprised women between the ages of 40 and 60. Institutional Ethics Committee approval and consent of participants were ensured.
MATERIAL AND METHODS
Two instruments, a pilot-tested, peer-reviewed, validated, structured questionnaire and the Menopause Rating Scale (MRS) were utilized for the study. The minimum sample size was calculated to be 385 per site. Statistical analysis was conducted using the IBM Statistical Package for Social Sciences.
RESULTS
A total of 1297 forms were analyzed. MRS scores showed psychological symptoms to be most prevalent. Joint and muscular pains were the most common somatic symptoms. Hot flashes and urogenital symptoms were experienced by a lower number. Our MRS scores were significantly higher than those seen in other regions. Urban women, site SJ, those with irregular menstrual cycles, and lower incomes scored higher than their counterparts. Awareness about menopause was patchy, especially regarding medication or support services available.
CONCLUSIONS
The high MRS scores emphasize the need to institute awareness programs, providing information on choices available for care (hormone replacement therapy, medications, or counseling) and information on where to access services. Primary care physicians can play a vital role in fulfilling this need by ensuring timely knowledge to the community, providing correct diagnosis and treatment. This will help improve the quality of life and sense of well-being of this community.
PubMed: 38827709
DOI: 10.4103/jfmpc.jfmpc_1129_23 -
Journal of Neurogastroenterology and... Jun 2024Chronic constipation is an important public health problem and significantly affects women's lives. It is important to investigate non-pharmacological applications that...
BACKGROUND/AIMS
Chronic constipation is an important public health problem and significantly affects women's lives. It is important to investigate non-pharmacological applications that can be used in the treatment of chronic constipation. The aim is to assess how abdominal massage and kinesio taping impact constipation severity, quality of life (QOL), and perception of subjective improvement in women with chronic constipation.
METHODS
Following Rome IV diagnostic criteria, women with constipation were randomly sorted into three distinct groups for study: massage group (lifestyle recommendations+abdominal massage, n:22), taping group (lifestyle recommendations+kinesio taping, n:22), and control group (lifestyle recommendations, n:22). Constipation Severity Instrument (CSI) (for constipation severity), 7 days bowel diary (for bowel function), Patient Assessment of Constipation QOL (PAC-QOL) questionnaire (for QOL), 4-item Likert-type scale (for perception of subjective improvement) was used.
RESULTS
The group x time interaction effect was significant in all CSI, bowel diary and PAC-QQL parameters, except for incomplete evacuation and PAC-QOL-worries/concerns, and a large effect size was found (Partial η2 > 0.14). Improvement scores of all parameters (except CSI-obstructive defecation, incomplete evacuation, PAC-QOL-worries/concerns) were similar in the massage and taping groups and were better than the control group. Noteworthy perceptions of subjective improvement and normalization of stool type predominantly manifested in the massage group (p<0.05).
CONSLUSION
Abdominal massage and kinesio taping are recommended as initial conservative interventions for managing chronic constipation within the therapeutic spectrum.
PubMed: 38826075
DOI: 10.5056/jnm23131