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Children (Basel, Switzerland) Jul 2023This secondary data analysis study aimed to examine the associations between 1) body size perception (BSP) and body size dissatisfaction (BSD) and 2) lifestyle behaviors...
This secondary data analysis study aimed to examine the associations between 1) body size perception (BSP) and body size dissatisfaction (BSD) and 2) lifestyle behaviors and BSP and BSD in adolescents. The study pooled cross-sectional data from two studies ( = 301) performed in adolescents. Weight and height were measured, while lifestyle behaviors and perceived actual and desired body size variables were self-reported. Linear regression analysis assessed the contribution of sex and zBMI to BSP and BSD scores. Pearson's correlation explored associations between BSP and BSD. Cohen's effect sizes compared satisfied and dissatisfied adolescents within the underestimators subgroup. A positive association between BSP and BSD scores was observed among girls living with normal-weight and overweight/obesity only (r = 0.26; ≤ 0.001 and r = 0.38; < 0.05, respectively). Underestimators who were satisfied with their body size showed a moderate effect size for a lower zBMI, a small effect size for lower screen time, and higher sleep duration compared to dissatisfied underestimators. Underestimation was associated with more body size satisfaction in adolescent girls with normal weight and overweight/obesity, suggesting a protective effect of underestimation. These findings support the hypothesis that body size satisfaction and underestimation in adolescents is associated with healthier lifestyle behaviors.
PubMed: 37508760
DOI: 10.3390/children10071263 -
Clinical & Experimental Optometry May 2020This review of the literature in visual search superiority in autism was intended to quantify the effect size of visual search performance in autism. Not all studies... (Review)
Review
This review of the literature in visual search superiority in autism was intended to quantify the effect size of visual search performance in autism. Not all studies have found an advantage within the autistic population. Early findings on search superiority have led to different proposed mechanisms for the observed results. A review of feature search found that the effect size was low across 15 included studies (Cohen's d 0.089 [-0.150 to 0.293]). However, the effect size was larger for more complex search paradigms using a conjunctive search strategy with Cohen's d showing a moderate effect of 0.223 (0.087 to 0.293). The majority of studies were limited to a small sample size and biased toward the high-functioning end of the autistic spectrum. The overall results indicate that within the autism spectrum disorder population there is a low to moderate search advantage compared to typically developing individuals.
Topics: Attention; Autism Spectrum Disorder; Discrimination Learning; Humans; Vision, Low; Visual Perception
PubMed: 31282016
DOI: 10.1111/cxo.12940 -
Current Biology : CB Jul 2022To create an accurate percept of the world, the visual system relies on past experience and prior assumptions. For example, although the retinal projection of an object...
To create an accurate percept of the world, the visual system relies on past experience and prior assumptions. For example, although the retinal projection of an object moving in depth changes drastically, we still perceive the object at a constant size and velocity. Consequently, if we see the same object with a constant retinal size at two different depth levels, the perceived size differs (illustrated by the Ponzo illusion). Past experience also directly influences perceptual judgments, an effect known as serial dependence. Such sequential effects have also been reported for oculomotor behavior, even on the trial-by-trial level. An integration of past experiences seems like a smart and sophisticated mechanism to reduce uncertainty and improve behavior in a world full of statistical regularities. By leveraging the Ponzo illusion to dissociate perceived size and speed from retinal signals, we show that serial-dependence effects for oculomotor control are mediated by retinal error signals. These sequential effects likely take place in early sensory processing because they transfer to different visual stimuli. In contrast to recently reported history effects for perceptual decisions, sequential effects for oculomotor control deviate from perceptual mechanisms by not integrating spatial context and by ignoring size and velocity constancy. Although this dissociation might appear suboptimal, we argue that this effect reveals the different goals of the oculomotor and perceptual systems. The oculomotor system tries to reduce retinal error signals to bring and keep the target close to the fovea, whereas the visual system interprets retinal input to achieve an accurate representation of the world..
Topics: Eye Movements; Fovea Centralis; Humans; Illusions; Judgment; Sensation
PubMed: 35640623
DOI: 10.1016/j.cub.2022.05.011 -
BMC Public Health Nov 2022Regardless of competitive athletes' body image pressures, only few studies have focused on adolescent sport participants' body image and the findings are inconclusive....
BACKGROUND
Regardless of competitive athletes' body image pressures, only few studies have focused on adolescent sport participants' body image and the findings are inconclusive. Furthermore, the role of competitive goals in sports on adolescents' body size perception has not been studied. We examined the factors associated with adolescents' competitive goals in sports and body size perception, and the associations between adolescents' competitive goals in sports and body size perception.
METHODS
The cross-sectional study consisted of 475 goal-oriented sports club participants and 936 reference youths (aged 14-16 years). The study questionnaire included multiple choice items on health behaviours, motives to exercise, competitive goals in sports and body size perception. The multinomial logistic regression analysis was used to investigate the associations.
RESULTS
Adolescents with competitive goals in sports perceived their body size as about the right size more frequently than reference youths (68% vs 47%, p < 0.001 in girls; 74% vs 61%, p < 0.001 in boys). More than one-fourth of girls with competitive goals in sports perceived themselves as overweight, although only 7% of them were overweight. Adolescents with appearance/weight motives to exercise and poor perceived physical fitness had higher odds of perceived fatness. Additionally, BMI was positively associated with perceived fatness and negatively with perceived thinness. Having competitive goals in sports was not independently associated with perceived fatness or perceived thinness.
CONCLUSIONS
Adolescents' BMI, appearance/weight motives to exercise, and perceived physical fitness were more strongly associated with body size perception than their competitive goals in sports. However, perceived fatness among girls with competitive goals in sports should be considered in organized sports.
Topics: Male; Female; Adolescent; Humans; Cross-Sectional Studies; Youth Sports; Size Perception; Overweight; Thinness; Finland; Goals; Body Size
PubMed: 36434562
DOI: 10.1186/s12889-022-14511-z -
PloS One 2022Perception and action are essential in our day-to-day interactions with the environment. Despite the dual-stream theory of action and perception, it is now accepted that...
Perception and action are essential in our day-to-day interactions with the environment. Despite the dual-stream theory of action and perception, it is now accepted that action and perception processes interact with each other. However, little is known about the impact of unpredicted changes of target size during grasping actions on perception. We assessed whether size perception and saccade amplitude were affected before and after grasping a target that changed its horizontal size during the action execution under the presence or absence of tactile feedback. We have tested twenty-one participants in 4 blocks of 30 trials. Blocks were divided into two experimental tactile feedback paradigms: tactile and non-tactile. Trials consisted of 3 sequential phases: pre-grasping size perception, grasping, and post-grasping size perception. During pre- and post-phases, participants executed a saccade towards a horizontal bar and performed a manual size estimation of the bar size. During grasping phase, participants were asked to execute a saccade towards the bar and to make a grasping action towards the screen. While grasping, 3 horizontal size perturbation conditions were applied: non-perturbation, shortening, and lengthening. 30% of the trials presented perturbation, meaning a symmetrically shortened or lengthened by 33% of the original size. Participants' hand and eye positions were assessed by a motion capture system and a mobile eye-tracker, respectively. After grasping, in both tactile and non-tactile feedback paradigms, size estimation was significantly reduced in lengthening (p = 0.002) and non-perturbation (p<0.001), whereas shortening did not induce significant adjustments (p = 0.86). After grasping, saccade amplitude became significantly longer in shortening (p<0.001) and significantly shorter in lengthening (p<0.001). Non-perturbation condition did not display adjustments (p = 0.95). Tactile feedback did not generate changes in the collected perceptual responses, but horizontal size perturbations did so, suggesting that all relevant target information used in the movement can be extracted from the post-action target perception.
Topics: Hand Strength; Humans; Movement; Psychomotor Performance; Saccades; Size Perception; Visual Perception
PubMed: 35290373
DOI: 10.1371/journal.pone.0264560 -
FASEB Journal : Official Publication of... Sep 2021Memorizing pheromonal locations is critical for many mammalian species as it involves finding mates and avoiding competitors. In rodents, pheromonal information is...
Memorizing pheromonal locations is critical for many mammalian species as it involves finding mates and avoiding competitors. In rodents, pheromonal information is perceived by the main and accessory olfactory systems. However, the role of somatosensation in context-dependent learning and memorizing of pheromone locations remains unexplored. We addressed this problem by training female mice on a multimodal task to locate pheromones by sampling volatiles emanating from male urine through the orifices of varying dimensions or shapes that are sensed by their vibrissae. In this novel pheromone location assay, female mice' preference toward male urine scent decayed over time when they were permitted to explore pheromones vs neutral stimuli, water. On training them for the associations involving olfactory and whisker systems, it was established that they were able to memorize the location of opposite sex pheromones, when tested 15 days later. This memory was not formed either when the somatosensory inputs through whisker pad were blocked or when the pheromonal cues were replaced with that of same sex. The association between olfactory and somatosensory systems was further confirmed by the enhanced expression of the activity-regulated cytoskeleton protein. Furthermore, the activation of main olfactory bulb circuitry by pheromone volatiles did not cause any modulation in learning and memorizing non-pheromonal volatiles. Our study thus provides the evidence for associations formed between different sensory modalities facilitating the long-term memory formation relevant to social and reproductive behaviors.
Topics: Animals; Discrimination Learning; Female; Male; Memory; Mice; Odorants; Olfactory Bulb; Olfactory Perception; Pheromones; Size Perception; Smell; Vibrissae
PubMed: 34407246
DOI: 10.1096/fj.202100167R -
Indian Journal of Ophthalmology Oct 2023Advances in patient treatment depend heavily on clinical trials (CTs). Patient volunteers for CT are tougher to recruit and retain. In order to administer CTs...
Attitude and perception toward clinical trials in India among patients and patient bystanders visiting the Indian Ophthalmology Clinical Trial Network: A multi-centric, cross-sectional survey.
PURPOSE
Advances in patient treatment depend heavily on clinical trials (CTs). Patient volunteers for CT are tougher to recruit and retain. In order to administer CTs effectively, it is necessary to comprehend how the public views and perceives participating in them. The study assessed the perception and attitudes of patients and bystanders toward CTs in India.
METHODS
This was a multi-centric, cross-sectional study among patients and bystanders using a questionnaire that consisted of socio-demographic characteristics and questions on knowledge and attitude toward participation in CTs. The minimum sample size estimated for the survey was 750.
RESULTS
A total of 1260 respondents (patients and bystanders) had participated in the survey. 42% of total respondents were aware about CTs. Unawareness regarding (i) voluntary power of an individual to participate in a CT (only 47%), (ii) entitled benefits of free treatment and medical insurance during enrolment in a CT (only 47%), and (iii) only 16% of the respondents knew involvement of human subjects in CT were the major highlights among those who had prior knowledge about CTs. Education was the most pervasive factor in shaping positive perception among the respondents. Occupation was another ubiquitous factor in shaping their perception regarding CTs.
CONCLUSION
The majority of respondents were not aware of CTs. The major concerns observed were time consumption and harmful nature of CTs that influenced their unwillingness to participate in CTs. Initiatives such as awareness campaigns and survey assessments that would result in scientifically effective health service policies would be strategic methods to enhance CT participation.
Topics: Humans; Cross-Sectional Studies; Health Knowledge, Attitudes, Practice; Ophthalmology; Perception; Surveys and Questionnaires; Clinical Trials as Topic
PubMed: 37787231
DOI: 10.4103/IJO.IJO_3035_22 -
Acta Psychologica Jan 2021Stimuli characteristics ha a decisive role in our perception and cognition. In the present study, we aimed to evaluate the effects of dimension of stimuli,...
Stimuli characteristics ha a decisive role in our perception and cognition. In the present study, we aimed to evaluate the effects of dimension of stimuli, two-dimensional (2D) versus three-dimensional (3D), on perception and working memory. In the first experiment, using the method of eye tracking, a higher blink rate, pupil size, and the number of saccade for three compared to 2D stimuli revealed a higher perceptual demand of 3D stimuli. In the second experiment, visual search task shows a higher response time for 3D stimuli and an equal performance with 2- and 3D stimuli in spatial working memory task. In the third experiment, four working memory tasks with high and low cognitive and perceptual load revealed 3D stimuli are memorized better in the both low and high load of working memory. We can conclude that 3D stimulus, compared 2D, imposes a higher load on perceptual system, but it is memorized better. It could be concluded that the phenomenon of filtering should occur in the early perceptual system for preventing overload.
Topics: Cognition; Humans; Memory, Short-Term; Reaction Time; Saccades; Visual Perception
PubMed: 33220612
DOI: 10.1016/j.actpsy.2020.103208 -
ELife Aug 2021The pupil provides a rich, non-invasive measure of the neural bases of perception and cognition and has been of particular value in uncovering the role of arousal-linked...
The pupil provides a rich, non-invasive measure of the neural bases of perception and cognition and has been of particular value in uncovering the role of arousal-linked neuromodulation, which alters both cortical processing and pupil size. But pupil size is subject to a multitude of influences, which complicates unique interpretation. We measured pupils of observers experiencing perceptual multistability-an ever-changing subjective percept in the face of unchanging but inconclusive sensory input. In separate conditions, the endogenously generated perceptual changes were either task-relevant or not, allowing a separation between perception-related and task-related pupil signals. Perceptual changes were marked by a complex pupil response that could be decomposed into two components: a dilation tied to task execution and plausibly indicative of an arousal-linked noradrenaline surge, and an overlapping constriction tied to the perceptual transient and plausibly a marker of altered visual cortical representation. Constriction, but not dilation, amplitude systematically depended on the time interval between perceptual changes, possibly providing an overt index of neural adaptation. These results show that the pupil provides a simultaneous reading on interacting but dissociable neural processes during perceptual multistability, and suggest that arousal-linked neuromodulator release shapes action but not perception in these circumstances.
Topics: Adult; Arousal; Attention; Humans; Pupil; Visual Perception; Young Adult
PubMed: 34378532
DOI: 10.7554/eLife.66161 -
International Journal of Environmental... Nov 2022The current study aimed to identify demographic and COVID experience predictors for COVID-19 risk perception among Chinese residents in Canada. A final sample of 653...
The current study aimed to identify demographic and COVID experience predictors for COVID-19 risk perception among Chinese residents in Canada. A final sample of 653 participants aged 18 and up completed an online survey in simplified Chinese during the peak of the first wave of COVID-19 (25 April-10 June 2020). After removing those with missing data on demographic covariates, as missing data cannot be imputed, 444 were included in the structural equation model, and COVID-19 risk perception was indexed by three outcome variables: self-infection risk perception (i.e., likelihood of personal infection of COVID-19); threat perception (i.e., whether the pandemic is a real threat); and future infection rate prediction (i.e., a latent variable for community, Ontario, Canada, and World infection rate predictions). Predictors included demographic (i.e., income, gender, education, age, household size, employment status, and life satisfaction) and COVID experience variables (i.e., personal connection with confirmed or suspected COVID-19 cases, self-isolation experience, perceived anti-Chinese discrimination, and confusion over COVID-19 information). In the structural equation model, we found increased risk perception for the following demographic and COVID experience predictors; women, relatively higher education, living alone, working in a medical field, lower in life satisfaction, having personal connection with confirmed or suspected COVID-19 cases, with perceived anti-Chinese discrimination, or showing high confusion over COVID-19 information.
Topics: Female; Humans; COVID-19; SARS-CoV-2; Surveys and Questionnaires; Perception; Demography; Ontario
PubMed: 36361329
DOI: 10.3390/ijerph192114448