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117 results for “Pursuit”
Data from: Stock composition of juvenile salmon taken by an abundant, pursuit-diving seabird in the coastal waters of British
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Pursuit predation with intermittent locomotion in zebrafish
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Data from: Predicted tracking error triggers catch-up saccades during smooth pursuit
For foveated animals, visual tracking of moving stimuli requires the synergy between saccades and smooth pursuit eye movements. Deciding to trigger a catch-up saccade during pursuit influences the quality of visual input. This decision is a trade-off between tolerating sustained position error when no saccade is triggered or a transient loss of vision during the saccade due to saccadic suppression. Although catch-up saccades have been extensively investigated, it remains unclear how the trigger decision is made by the brain. de Brouwer et al (2002) demonstrated that catch-up saccades were less likely to occur when the expected time to foveate a target using pursuit alone is between 40 and 180ms into the future, referred to as the smooth zone. However, this descriptive result lacks a mechanistic explanation for how the trigger decision is made. More recently, we proposed a decision model (Coutinho et al., 2018) that relies on a probabilistic estimation of predicted position error (PEpred) during visual tracking. To test the model predictions, we investigated how human participants combined predicted position error, retinal slip, and the uncertainty in those estimates to make trigger decisions. We found a significant effect of the pre-saccadic magnitude of PEpred on trigger time and occurrence of catch-up saccades. To test the role of uncertainty, we blurred the moving target which led to longer and more variable saccade trigger times and more smooth pursuit trials, consistent with model predictions. As predicted by our model, large PEpred (>10deg) produced early saccades regardless of the level of uncertainty while saccades preceded by small PEpred (<10deg) were significantly modulated by high uncertainty. Our model also predicted increased signal dependent noise as retinal slip increases, which resulted in longer saccade trigger times and more smooth trials. In conclusion, the data supports our hypothesized role of PEpred in deciding when to trigger a catch-up saccade during smooth pursuit while taking into account uncertainty in sensory estimates.
Data from: A migratory northern ungulate in the pursuit of spring: jumping or surfing the green wave?
The Forage Maturation Hypothesis (FMH) states that herbivores migrate along a phenological gradient of plant development in order to maximize energy intake. Despite strong support for the FMH, the actual relationship between plant phenology and ungulate movement has remained enigmatic. We linked plant phenology (MODIS-NDVI) and space use of 167 migratory and 78 resident red deer (Cervus elaphus) using a space-time-time matrix of "springness", defined as the instantaneous rate of green-up (IRG). Consistent with the FMH, migrants experienced substantially greater access to early plant phenology than residents. Deer were also more likely to migrate in areas where migration led to greater gains in springness. Rather than "surfing the green wave" during migration, migratory red deer moved rapidly from the winter to the summer range, thereby "jumping the green wave". However, migrants, and to a lesser degree residents, did track phenological green-up through parts of the growing season by making smaller-scale adjustments in habitat use. We conclude that, whereas in some systems migration itself is a way to surf the green wave, in others it may simply be a means to re-connect with phenological spring at the summer range.
Data from: The pursuit strategy of predatory bluefish
A predator's ability to capture prey depends critically on how it coordinates its approach in response to a prey's motion. Flying insects, bats, and raptors are capable of capturing prey with a strategy known as parallel navigation, which allows a predator to move directly toward the anticipated point of interception. It is unclear if predators using other modes of locomotion are capable of employing this strategy when pursuing evasive prey. Using kinematic measurements and mathematical modeling, we tested whether bluefish (Pomatomus saltatrix) pursue prey fish (Fundulus heteroclitus) with parallel navigation. We found that the directional changes of bluefish were not consistent with this strategy, but rather were predicted by a strategy known as deviated pursuit. Although deviated pursuit requires few sensory cues and relatively modest motor coordination, a comparison of mathematical models suggested negligible differences in path length from parallel navigation, largely due to the acceleration exhibited by bluefish near the end of a pursuit. Therefore, the strategy of bluefish is unlike flying predators, but offers comparable performance with potentially more robust control that may be well-suited to the visual system and habitat of fishes. These findings offer a foundation for understanding the sensing and locomotor control of predatory fishes.
Dataset from 'Billino,J., Hennig, J., & Gegenfurtner K.R. (2016). The role of dopamine in anticipatory pursuit eye movements: Insights from genetic polymorphisms in healthy adults. eNeuro, 3(6). doi: 10.1523/ENEURO.0190-16.2016'
<p>Dataset associated with the following publication:</p> <p>Billino,J., Hennig, J., & Gegenfurtner K.R. (2016). The role of dopamine in anticipatory pursuit eye movements: Insights from genetic polymorphisms in healthy adults. eNeuro, 3(6). doi: 10.1523/ENEURO.0190-16.2016 <span><a></a></span></p> <p>--------------------------------------------------------------</p> <p>The folder contains 2 data files and 1 description file providing column labels.<br> The data file 'anticippursuit.txt' contains the dataset for the anticipatory pursuit task.<br> The data file 'visualpursuit.txt' contains the dataset for the visually pursuit task.</p> <p>-------------------------------------------------------------</p> <p>For further questions, please contact:<br> jutta.billino[at]psychol.uni-giessen.de</p> <p> </p>
Attention is allocated closely ahead of the target during smooth pursuit eye movements: evidence from EEG frequency tagging
<p>Dataset relative to the following publication:</p> <p>Chen, J., Valsecchi, M. & Gegenfurtner, K.R. (2017). Attention is allocated closely ahead of the target during smooth pursuit eye movements: Evidence from EEG frequency tagging. <strong>Neuropsychologia</strong>, doi: 10.1016/j.neuropsychologia.2017.06.024.</p> <p>Please refer to "data description.txt" in each experiment for details about the data. </p>
Enhanced brain responses to color during smooth pursuit eye movements
<p>Dataset relative to the following publication:</p> <p>Chen, J., Valsecchi, M. & Gegenfurtner, K.R. (2017). Enhanced brain responses to color during smooth pursuit eye movements. <em>Journal of Neurophysiology, </em>DOI: 10.1152/jn.00208.2017</p> <p>Please refer to "data description.txt" for details about the data. </p>
The Role and Risks of Essay Writing Services in Academic Pursuits
<p>In contemporary academia, the proliferation of online essay writing services such as Essayservice.com has sparked debates regarding their ethical implications and academic integrity. While these platforms offer assistance to students overwhelmed with academic tasks, their usage raises concerns about plagiarism and the erosion of genuine learning.</p> <p>Essay writing services like <a title="https://www.linkedin.com/pulse/honest-essayservicecom-review-what-i-supposed-find-sana-a-kroh-ikyyc" href="https://www.linkedin.com/pulse/honest-essayservicecom-review-what-i-supposed-find-sana-a-kroh-ikyyc" target="_blank" rel="noopener">Essayservice.com</a> provide customized essays, research papers, and other academic assignments for a fee. They promise original content, timely delivery, and confidentiality. However, students must be cautious about the potential risks associated with their utilization.</p> <p>One significant concern is the ethical dilemma of submitting work that is not one's own. Using these services could lead to academic dishonesty and undermine the purpose of education, which is to foster critical thinking and intellectual growth. Moreover, there's a risk of getting caught for plagiarism, which can result in severe consequences, including expulsion from educational institutions.</p> <p>Furthermore, reliance on essay writing services deprives students of the opportunity to develop essential skills such as research, writing, and critical analysis. Academic success should not be measured solely by grades but also by the knowledge and skills gained through the learning process.</p> <p>Despite the allure of convenience, students should prioritize academic integrity and personal growth over shortcuts offered by essay writing services. Instead of outsourcing their assignments, they should seek support from professors, academic advisors, and writing centers to enhance their skills and overcome academic challenges legitimately.</p> <p>In conclusion, while essay writing services like Essayservice.com offer a quick fix to academic pressures, their usage comes with ethical and academic risks. Students must weigh these considerations carefully and make informed decisions that prioritize their long-term academic and personal development.</p>
Visual pursuit behavior in mice maintains the pursued prey on the retinal region with least optic flow
<p>Mice have a large visual field that is constantly stabilized by vestibular ocular reflex (VOR) driven eye rotations that counter head-rotations. While maintaining their extensive visual coverage is advantageous for predator detection, mice also track and capture prey using vision. However, in the freely moving animal quantifying object location in the field of view is challenging. Here, we developed a method to digitally reconstruct and quantify the visual scene of freely moving mice performing a visually based prey capture task. By isolating the visual sense and combining a mouse eye optic model with the head and eye rotations, the detailed reconstruction of the digital environment and retinal features were projected onto the corneal surface for comparison, and updated throughout the behavior. By quantifying the spatial location of objects in the visual scene and their motion throughout the behavior, we show that the prey image consistently falls within a small area of the VOR-stabilized visual field. This functional focus coincides with the region of minimal optic flow in the visual field and consequently minimal motion-induced image blur during pursuit. The functional focus lies in the upper-temporal part of the retina and coincides with the reported high density-region of Alpha-ON<sub> </sub>sustained retinal ganglion cells.</p>
Non-inferiority Study of the Pursuit of Enteral Nutrition Compared to a Strategy of Gastric Emptiness Peri-extubation. Cluster Randomized Trial
ClinicalTrials.gov study NCT03335345. IPD Sharing: UNDECIDED. Countries: 2. Publications: 2.
Cardiac Arrest Pursuit Trial With Unique Registration and Epidemiologic Surveillance
ClinicalTrials.gov study NCT03700203. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Impact of Osteopathic Manipulative Treatment on Pursuit Eye Movements in Healthy Human Adults
ClinicalTrials.gov study NCT05018390. IPD Sharing: UNDECIDED. Countries: 1. Publications: 1.
Data from: Dragonflies use underdamped pursuit to chase conspecifics
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Data from: Predicted tracking error triggers catch-up saccades during smooth pursuit
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Visual pursuit behavior in mice maintains the pursued prey on the retinal region with least optic flow
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Data from: A migratory northern ungulate in the pursuit of spring: jumping or surfing the green wave?
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Eye saccades align optic flow with retinal specializations during object pursuit in freely moving ferrets
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Data from: The pursuit strategy of predatory bluefish
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Data from: Dynamic visual cues induce jaw opening and closing by tiger beetles during pursuit of prey
In dynamic locomotory contexts, visual cues often trigger adaptive behaviour by the viewer, yet studies investigating how animals determine impending collisions typically employ either stationary viewers or objects. Here, we describe a dynamic situation of visually guided prey pursuit in which both impending prey contact and escape elicit observable adaptive behaviours in the pursuer, a predatory beetle. We investigated which visual cues may independently control opening and closing of the beetle's jaws during chases of prey dummies. Jaw opening and closing typically occur when prey is within the 60° binocular field, but not at specific distances, angular sizes or time-to-collision. We show that a sign change in the expansion rate of the target image precedes jaw opening (16 ms) and closing (35 ms), signalling to the beetle that it is gaining on the target or that the target is getting away. We discuss the 'sloppiness' of such variation in the lag of the behavioural response, especially jaw closing, as an adaptation to uncertainty about target position due to degradation of the target image by motion blur from the fast-running beetle.
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.