keyword
MENU ▼
Read by QxMD icon Read
search

Motion perception

keyword
https://www.readbyqxmd.com/read/28337137/an-adaptive-neural-mechanism-for-acoustic-motion-perception-with-varying-sparsity
#1
Danish Shaikh, Poramate Manoonpong
Biological motion-sensitive neural circuits are quite adept in perceiving the relative motion of a relevant stimulus. Motion perception is a fundamental ability in neural sensory processing and crucial in target tracking tasks. Tracking a stimulus entails the ability to perceive its motion, i.e., extracting information about its direction and velocity. Here we focus on auditory motion perception of sound stimuli, which is poorly understood as compared to its visual counterpart. In earlier work we have developed a bio-inspired neural learning mechanism for acoustic motion perception...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28330878/linear-summation-of-repulsive-and-attractive-serial-dependencies-orientation-and-motion-dependencies-sum-in-motion-perception
#2
David Alais, Johahn Leung, Erik Van der Burg
Recent work from several groups has shown that perception of various visual attributes in human observers at a given moment is biased towards what was recently seen. This positive serial dependency is a kind of temporal averaging which exploits short-term correlations in visual scenes to reduce noise and stabilise perception. To date this stabilising 'continuity field' has been demonstrated on stable visual attributes such as orientation and face identity, yet it would be counterproductive to apply it to dynamic attributes where change sensitivity is needed...
March 22, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28330382/algorithm-based-motion-magnification-for-video-processing-in-urological-laparoscopy
#3
Fabian Adams, Reto Schoelly, Daniel Schlager, Martin Schoenthaler, Dominik Stefan Schoeb, Konrad Wilhelm, Simon Hein, Ulrich Wetterauer, Arkadiusz Miernik
PURPOSE: Minimally invasive surgery is in constant further development and has replaced many conventional operative procedures. If vascular structure movement could be detected during these procedures, it could reduce the risk of vascular injury and conversion to open surgery. The recently proposed motion-amplifying algorithm Eulerian Video Magnification (EVM) has been shown to substantially enhance minimal object changes in digitally recorded video that is barely perceptible to the human eye...
March 23, 2017: Journal of Endourology
https://www.readbyqxmd.com/read/28326440/effects-of-visual-motion-consistent-or-inconsistent-with-gravity-on-postural-sway
#4
Priscilla Balestrucci, Elena Daprati, Francesco Lacquaniti, Vincenzo Maffei
Vision plays an important role in postural control, and visual perception of the gravity-defined vertical helps maintaining upright stance. In addition, the influence of the gravity field on objects' motion is known to provide a reference for motor and non-motor behavior. However, the role of dynamic visual cues related to gravity in the control of postural balance has been little investigated. In order to understand whether visual cues about gravitational acceleration are relevant for postural control, we assessed the relation between postural sway and visual motion congruent or incongruent with gravity acceleration...
March 22, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28320677/intermanual-apparent-tactile-motion-and-its-extension-to-3d-interactions
#5
Siyan Zhao, Ali Israr, Micah Fenner, Roberta Klatzky
Information provided by sensory systems is inherently ambiguous as to its source in the physical world. To arrive at a coherent representation, perception deploys heuristic rules and multimodal input, which potentially produce errors such as illusions. The current work uses these effects to create apparent tactile motion and illusory depth motion using sparse vibrotactile stimulation across the hands. Experiment 1 showed the effects of vibrotactile duration and temporal separation between the hands on the quality of perceived illusory linear motion...
March 13, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28315957/right-sided-dominance-of-the-bilateral-vestibular-system-in-the-upper-brainstem-and-thalamus
#6
Marianne Dieterich, V Kirsch, T Brandt
MRI diffusion tensor imaging tractography was performed on the bilateral vestibular brainstem pathways, which run from the vestibular nuclei via the paramedian and posterolateral thalamic subnuclei to the parieto-insular vestibular cortex. Twenty-one right-handed healthy subjects participated. Quantitative analysis revealed a rope-ladder-like system of vestibular pathways in the brainstem with crossings at pontine and mesencephalic levels. Three structural types of right-left fiber distributions could be delineated: (1) evenly distributed pathways at the lower pontine level from the vestibular nuclei to the pontine crossing, (2) a moderate, pontomesencephalic right-sided lateralization between the pontine and mesencephalic crossings, and (3) a further increase of the right-sided lateralization above the mesencephalic crossing leading to the thalamic vestibular subnuclei...
March 18, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28301322/semicircular-canal-modeling-in-human-perception
#7
Houshyar Asadi, Shady Mohamed, Chee Peng Lim, Saeid Nahavandi, Eugene Nalivaiko
The human vestibular system is a sensory and equilibrium system that manages and controls the human sense of balance and movement. It is the main sensor humans use to perceive rotational and linear motions. Determining an accurate mathematical model of the human vestibular system is significant for research pertaining to motion perception, as the quality and effectiveness of the motion cueing algorithm (MCA) directly depends on the mathematical model used in its design. This paper describes the history and analyses the development process of mathematical semicircular canal models...
March 16, 2017: Reviews in the Neurosciences
https://www.readbyqxmd.com/read/28301185/embodied-memory-allows-accurate-and-stable-perception-of-hidden-objects-despite-orientation-change
#8
Jing Samantha Pan, Ned Bingham, Geoffrey P Bingham
Rotating a scene in a frontoparallel plane (rolling) yields a change in orientation of constituent images. When using only information provided by static images to perceive a scene after orientation change, identification performance typically decreases (Rock & Heimer, 1957). However, rolling generates optic flow information that relates the discrete, static images (before and after the change) and forms an embodied memory that aids recognition. The embodied memory hypothesis predicts that upon detecting a continuous spatial transformation of image structure, or in other words, seeing the continuous rolling process and objects undergoing rolling observers should accurately perceive objects during and after motion...
March 16, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28300605/a-rapid-quantification-of-binocular-misalignment-without-recording-eye-movements-vertical-and-torsional-alignment-nulling
#9
Kara H Beaton, Mark J Shelhamer, Dale C Roberts, Michael C Schubert
BACKGROUND: Small, innate asymmetries between the left and right otolith organs can cause ocular misalignment with symptoms that include double vision and motion sickness. Additionally, ocular misalignment affects nearly 5% of the US population. We have developed a portable, non-invasive technology that uses subjective perception of binocular visual signals to estimate relative binocular alignment. NEW METHOD AND RESULTS: The Vertical Alignment Nulling (VAN) and Torsional Alignment Nulling (TAN) tests ask subjects to view one red and one blue line on a tablet computer while looking through color-matched red and blue filters so that each eye sees only one of the lines...
March 11, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28299726/implied-motion-language-can-influence-visual-spatial-memory
#10
David W Vinson, Jan Engelen, Rolf A Zwaan, Teenie Matlock, Rick Dale
How do language and vision interact? Specifically, what impact can language have on visual processing, especially related to spatial memory? What are typically considered errors in visual processing, such as remembering the location of an object to be farther along its motion trajectory than it actually is, can be explained as perceptual achievements that are driven by our ability to anticipate future events. In two experiments, we tested whether the prior presentation of motion language influences visual spatial memory in ways that afford greater perceptual prediction...
March 15, 2017: Memory & Cognition
https://www.readbyqxmd.com/read/28298300/differential-processing-of-the-direction-and-focus-of-expansion-of-optic-flow-stimuli-in-areas-mst-and-v3a-of-the-human-visual-cortex
#11
Samantha L Strong, Edward H Silson, Andre D Gouws, Antony B Morland, Declan J McKeefry
Human neuropsychological and neuroimaging studies have raised the possibility that different attributes of optic flow stimuli, namely radial direction and the position of the focus of expansion (FOE), are processed within separate cortical areas. In the human brain, visual areas V5/MT+ and V3A have been proposed as integral to the analysis of these different attributes of optic flow stimuli. In order to establish direct causal relationships between neural activity in V5/MT+ and V3A and the perception of radial motion direction and FOE position, we used Transcranial Magnetic Stimulation (TMS) to disrupt cortical activity in these areas whilst participants performed behavioural tasks dependent on these different aspects of optic flow stimuli...
March 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28298299/time-compression-of-visual-perception-around-microsaccades
#12
Gongchen Yu, Mingpo Yang, Peng Yu, Michael C Dorris
Even during fixation, our eyes are in constant motion. For example, microsaccades are small (typically<1°) eye movements that occur 1~3 times/second. Despite their tiny and transient nature, our percept of visual space is compressed prior to microsaccades (Hafed 2013). As visual space and time are interconnected at both the physical and physiological levels, we asked whether microsaccades also affect the temporal aspects of visual perception. Here we demonstrate that the perceived interval between transient visual stimuli was compressed if accompanied by microsaccades...
March 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28297036/wide-field-landers-keratoprothesis-in-various-combined-corneal-and-vitreoretinal-problems-twelve-month-results
#13
Ziya Kapran, Abdullah Ozkaya, Gurkan Erdogan, Yalcin Karakucuk, Tugba Aydogan Gezginaslan, Irfan Perente, Muhittin Taskapili
BACKGROUND AND OBJECTIVE: To investigate the outcomes of combined pars plana vitrectomy (PPV), transient keratoprosthesis (TKP), and penetrating keratoplasty (PKP) in patients with coexisting corneal and vitreoretinal diseases. PATIENTS AND METHODS: Patients who underwent PPV, TKP, and PKP were included. The main outcome measures were change in visual acuity (VA), clarity of the graft, and retinal attachment. RESULTS: Twenty eyes were included...
March 1, 2017: Ophthalmic Surgery, Lasers & Imaging Retina
https://www.readbyqxmd.com/read/28293182/visual-field-map-clusters-in-high-order-visual-processing-organization-of-v3a-v3b-and-a-new-cloverleaf-cluster-in-the-posterior-superior-temporal-sulcus
#14
Brian Barton, Alyssa A Brewer
The cortical hierarchy of the human visual system has been shown to be organized around retinal spatial coordinates throughout much of low- and mid-level visual processing. These regions contain visual field maps (VFMs) that each follows the organization of the retina, with neighboring aspects of the visual field processed in neighboring cortical locations. On a larger, macrostructural scale, groups of such sensory cortical field maps (CFMs) in both the visual and auditory systems are organized into roughly circular cloverleaf clusters...
2017: Frontiers in Integrative Neuroscience
https://www.readbyqxmd.com/read/28292667/minds-in-motion-in-memory-enhanced-spatial-memory-driven-by-the-perceived-animacy-of-simple-shapes
#15
Benjamin van Buren, Brian J Scholl
Even simple geometric shapes are seen as animate and goal-directed when they move in certain ways. Previous research has revealed a great deal about the cues that elicit such percepts, but much less about the consequences for other aspects of perception and cognition. Here we explored whether simple shapes that are perceived as animate and goal-directed are prioritized in memory. We investigated this by asking whether subjects better remember the locations of displays that are seen as animate vs. inanimate, controlling for lower-level factors...
March 11, 2017: Cognition
https://www.readbyqxmd.com/read/28291461/corneal-and-corneoscleral-injury-in-combat-ocular-trauma-from-operations-iraqi-freedom-and-enduring-freedom
#16
Anton Vlasov, Denise S Ryan, Spencer Ludlow, Andrew Coggin, Eric D Weichel, Richard D Stutzman, Kraig S Bower, Marcus H Colyer
OBJECTIVES: To examine the incidence and the etiology of corneal and corneoscleral injuries in the setting of combat ocular trauma, and to determine what effect these injuries have on overall visual impairment from combat ocular trauma. METHODS: Retrospective, noncomparative, interventional case series, analyzing U.S. service members who were evacuated to the former Walter Reed Army Medical Center (WRAMC). Primary outcome measures were types of corneal injuries, length of follow-up at WRAMC, globe survival, and anatomical causes of blindness...
March 2017: Military Medicine
https://www.readbyqxmd.com/read/28285029/biological-motion-processing-in-schizophrenia-systematic-review-and-meta-analysis
#17
Łukasz Okruszek, Izabela Pilecka
CONTEXT: Patients with schizophrenia show impairments in processing of biological motion. This is especially important since deficits in domains of social cognition has been associated with functional outcome and everyday functioning in this population. OBJECTIVES: We conducted a systematic review and meta-analysis of studies which have used point-light displays to present whole-body motion to patients with schizophrenia and healthy controls, to evaluate the magnitude of differences between these groups in biological motion processing...
March 9, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28272421/eeg-frequency-tagging-dissociates-between-neural-processing-of-motion-synchrony-and-human-quality-of-multiple-point-light-dancers
#18
Nihan Alp, Andrey R Nikolaev, Johan Wagemans, Naoki Kogo
Do we perceive a group of dancers moving in synchrony differently from a group of drones flying in-sync? The brain has dedicated networks for perception of coherent motion and interacting human bodies. However, it is unclear to what extent the underlying neural mechanisms overlap. Here we delineate these mechanisms by independently manipulating the degree of motion synchrony and the humanoid quality of multiple point-light displays (PLDs). Four PLDs moving within a group were changing contrast in cycles of fixed frequencies, which permits the identification of the neural processes that are tagged by these frequencies...
March 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28271220/constraints-on-perception-of-information-from-obstacles-during-foot-clearance-in-people-with-chronic-stroke
#19
Mohsen Shafizadeh, Jonathan Wheat, Keith Davids, Noureddin Nakhostin Ansari, Ali Ali, Samira Garmabi
The aim of this study was to examine effects of different types of task constraints on coupling of perception and action in people with chronic stroke when crossing obstacles during a walking task. Ten participants with hemiplegic chronic stroke volunteered to walk over a static obstacle under two distinct task constraints: simple and dual tasks. Under simple task constraints, without specific instructions, participants walked at their preferred speed and crossed over an obstacle. Under dual task constraints, the same individuals were required to subtract numbers whilst walking...
March 7, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28270573/saccadic-suppression-is-embedded-within-extended-oscillatory-modulation-of-sensitivity
#20
Alessandro Benedetto, Maria Concetta Morrone
Action and perception are intimately coupled systems; one clear case is saccadic suppression, the reduced visibility around the time of saccades, important in mediating visual stability; another is the oscillatory modulation of visibility synchronized with hand action. To suppress effectively the spurious retinal motion generated by the eye movements, it is crucial that saccadic suppression and saccadic onset be temporally synchronous. However, the mechanisms that determine this temporal synchrony are unknown...
March 7, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
keyword
keyword
31538
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"