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Visual processing delay

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https://www.readbyqxmd.com/read/28345189/tuning-face-perception-with-electrical-stimulation-of-the-fusiform-gyrus
#1
Corey J Keller, Ido Davidesco, Pierre Megevand, Fred A Lado, Rafael Malach, Ashesh D Mehta
The fusiform gyrus (FG) is an important node in the face processing network, but knowledge of its causal role in face perception is currently limited. Recent work demonstrated that high frequency stimulation applied to the FG distorts the perception of faces in human subjects (Parvizi et al. []: J Neurosci 32:14915-14920). However, the timing of this process in the FG relative to stimulus onset and the spatial extent of FG's role in face perception are unknown. Here, we investigate the causal role of the FG in face perception by applying precise, event-related electrical stimulation (ES) to higher order visual areas including the FG in six human subjects undergoing intracranial monitoring for epilepsy...
March 27, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28334225/pom-thalamocortical-input-drives-layer-specific-microcircuits-in-somatosensory-cortex
#2
Nicholas J Audette, Joanna Urban-Ciecko, Megumi Matsushita, Alison L Barth
Higher-order thalamic nuclei, such as the posterior medial nucleus (POm) in the somatosensory system or the pulvinar in the visual system, densely innervate the cortex and can influence perception and plasticity. To systematically evaluate how higher-order thalamic nuclei can drive cortical circuits, we investigated cell-type selective responses to POm stimulation in mouse primary somatosensory (barrel) cortex, using genetically targeted whole-cell recordings in acute brain slices. We find that ChR2-evoked thalamic input selectively targets specific cell types in the neocortex, revealing layer-specific modules for the summation and processing of POm input...
March 10, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28329909/testing-the-boundaries-of-boundary-extension-anticipatory-scene-representation-across-development-and-disorder
#3
G Spanò, H Intraub, J O Edgin
Recent studies have suggested that Boundary Extension (BE), a scene construction error, may be linked to the function of the hippocampus. In this study, we tested BE in two groups with variations in hippocampal development and disorder: a typically developing sample ranging from preschool to adolescence and individuals with Down syndrome. We assessed BE across three different test modalities: drawing, visual recognition, and a 3D scene boundary reconstruction task. Despite confirmed fluctuations in memory function measured through a neuropsychological assessment, the results showed consistent BE in all groups across test modalities, confirming the near universal nature of BE...
March 22, 2017: Hippocampus
https://www.readbyqxmd.com/read/28326967/development-and-validation-of-a-remote-home-safety-protocol
#4
Sergio Romero, Mi Jung Lee, Ivana Simic, Charles Levy, Jon Sanford
AIM: Environmental assessments and subsequent modifications conducted by healthcare professionals can enhance home safety and promote independent living. However, travel time, expense and the availability of qualified professionals can limit the broad application of this intervention. Remote technology has the potential to increase access to home safety evaluations. PURPOSE: This study describes the development and validation of a remote home safety protocol that can be used by a caregiver of an elderly person to video-record their home environment for later viewing and evaluation by a trained professional...
March 22, 2017: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/28323074/an-obesogenic-refined-low-fat-diet-disrupts-attentional-and-behavioral-control-processes-in-a-vigilance-task-in-rats
#5
Aaron P Blaisdell, Traci Biedermann, Eric Sosa, Ava Abuchaei, Neveen Youssef, Sylvie Bradesi
Diets consisting of refined foods (REF) are associated with poor physical (e.g., obesity and diabetes) and mental (e.g., depression) health and impaired cognition. Few animal studies have explored the causal links between diet processing and health. Instead, most studies focus on the role of macronutrients, especially carbohydrate and fat concurrently with how processed are the ingredients. We previously showed that a REF low fat diet (LFD) caused greater adiposity and impaired motivation compared to an unrefined control (CON) diet consisting of similar macronutrient ratios (Blaisdell et al...
March 18, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28321884/electromechanical-response-times-in-the-knee-muscles-in-young-and-old-women
#6
Agnieszka Szpala, Alicja Rutkowska-Kucharska
INTRODUCTION: The aim of the study was to compare electromechanical response times (total reaction time, TRT; pre-motor time, PMT; electromechanical delay) in the knee muscles in groups of young and older women during release of peak torque (PT). METHODS: Fifty women (one group approximately 20 years of age and the other approximately 60) participated in the study. PT and electromyographic activity were measured for flexors and extensors of the right and left knee in static conditions in response to a visual stimulus...
March 21, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28318972/persistent-single-neuron-activity-during-working-memory-in-the-human-medial-temporal-lobe
#7
Simon Kornblith, Rodrigo Quian Quiroga, Christof Koch, Itzhak Fried, Florian Mormann
Working memory is an essential component of human cognition. Persistent activity related to working memory has been reported in many brain areas, including the inferior temporal and prefrontal cortex [1-8]. The medial temporal lobe (MTL) contains "concept cells" that respond invariantly to specific individuals or places whether presented as images, text, or speech [9, 10]. It is unknown, however, whether the MTL also participates in working memory processes. We thus sought to determine whether human MTL neurons respond to images held in working memory...
March 15, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28303113/neurophysiological-correlates-of-visual-dominance-a-lateralized-readiness-potential-investigation
#8
You Li, Mingxin Liu, Wei Zhang, Sai Huang, Bao Zhang, Xingzhou Liu, Qi Chen
When multisensory information concurrently arrives at our receptors, visual information often receives preferential processing and eventually dominates awareness and behavior. Previous research suggested that the visual dominance effect implicated the prioritizing of visual information into the motor system. In order to further reveal the underpinning neurophysiological mechanism of how visual information is prioritized into the motor system when vision dominates audition, the present study examined the time course of a particular motor activation ERP component, the lateralized readiness potential (LRP), during multisensory competition...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28303100/a-neural-dynamic-architecture-for-reaching-and-grasping-integrates-perception-and-movement-generation-and-enables-on-line-updating
#9
Guido Knips, Stephan K U Zibner, Hendrik Reimann, Gregor Schöner
Reaching for objects and grasping them is a fundamental skill for any autonomous robot that interacts with its environment. Although this skill seems trivial to adults, who effortlessly pick up even objects they have never seen before, it is hard for other animals, for human infants, and for most autonomous robots. Any time during movement preparation and execution, human reaching movement are updated if the visual scene changes (with a delay of about 100 ms). The capability for online updating highlights how tightly perception, movement planning, and movement generation are integrated in humans...
2017: Frontiers in Neurorobotics
https://www.readbyqxmd.com/read/28302161/cognitive-profile-in-prodromal-dementia-with-lewy-bodies
#10
Jennifer Kemp, Nathalie Philippi, Clélie Phillipps, Catherine Demuynck, Timothée Albasser, Catherine Martin-Hunyadi, Catherine Schmidt-Mutter, Benjamin Cretin, Frédéric Blanc
BACKGROUND: Cortical and subcortical cognitive impairments have been found in dementia with Lewy bodies (DLB). Roughly, they comprise visuoconstructive and executive dysfunction, whereas memory would remain relatively spared. However, the cognitive profile of patients with prodromal DLB remains poorly illustrated to date. METHODS: We included 37 patients with prodromal DLB (age 67.2 ± 8.6 years, 18 men, Mini Mental State Examination [MMSE] score 27.4 ± 2) and 29 healthy control subjects (HCs; age 68...
March 16, 2017: Alzheimer's Research & Therapy
https://www.readbyqxmd.com/read/28288702/the-oil-rich-alga-schizochytrium-sp-as-a-dietary-source-of-docosahexaenoic-acid-improves-shape-discrimination-learning-associated-with-visual-processing-in-a-canine-model-of-senescence
#11
K B Hadley, J Bauer, N W Milgram
Whole cell Schizochytrium sp. is a rich source of omega-3 long-chain polyunsaturated fatty acids (n-3 LCPUFA) including docosahexaenoic acid (DHA), an important nutrient for brain health. Aged beagle dogs experienced on a visuospatial task of working memory, variable-delay delayed-non-matching-to-position were used to assess efficacy of DHA-rich microalgae based upon DHA wt% of total phospholipids and 8-iso-PGF2α concentrations in plasma, and performance on cognitive assessments of visual object discrimination, learning, and memory consolidation after 25 weeks on fortified diet...
March 2017: Prostaglandins, Leukotrienes, and Essential Fatty Acids
https://www.readbyqxmd.com/read/28287761/familiarity-speeds-up-visual-short-term-memory-consolidation
#12
Weizhen Xie, Weiwei Zhang
Existing long-term memory (LTM) can boost the number of retained representations over a short delay in visual short-term memory (VSTM). However, it is unclear whether and how prior LTM affects the initial process of transforming fragile sensory inputs into durable VSTM representations (i.e., VSTM consolidation). The consolidation speed hypothesis predicts faster consolidation for familiar relative to unfamiliar stimuli. Alternatively, the perceptual boost hypothesis predicts that the advantage in perceptual processing of familiar stimuli should add a constant boost for familiar stimuli during VSTM consolidation...
March 13, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28286477/transfer-effects-to-a-multimodal-dual-task-after-working-memory-training-and-associated-neural-correlates-in-older-adults-a-pilot-study
#13
Stephan Heinzel, Jérôme Rimpel, Christine Stelzel, Michael A Rapp
Working memory (WM) performance declines with age. However, several studies have shown that WM training may lead to performance increases not only in the trained task, but also in untrained cognitive transfer tasks. It has been suggested that transfer effects occur if training task and transfer task share specific processing components that are supposedly processed in the same brain areas. In the current study, we investigated whether single-task WM training and training-related alterations in neural activity might support performance in a dual-task setting, thus assessing transfer effects to higher-order control processes in the context of dual-task coordination...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28276964/occupational-engagement-and-cognitive-functioning-among-persons-with-schizophrenia-an-explorative-study
#14
Annika Lexén, Ulrika Bejerholm
BACKGROUND: Cognitive functioning may have implications for engagement in daily occupations among people with schizophrenia. OBJECTIVES: This cross-sectional study explores relationships between time use assessed occupational engagement and cognitive functioning among persons with schizophrenia. METHODS: Thirty-nine participants from four mental health care services in Sweden participated. The Profile of Occupational Engagement among persons with Severe mental illness (POES) and a cognitive test battery was used...
February 9, 2017: Scandinavian Journal of Occupational Therapy
https://www.readbyqxmd.com/read/28270759/attentional-modulation-of-change-detection-erp-components-by-peripheral-retro-cueing
#15
Paula Pazo-Álvarez, Adriana Roca-Fernández, Francisco-Javier Gutiérrez-Domínguez, Elena Amenedo
Change detection is essential for visual perception and performance in our environment. However, observers often miss changes that should be easily noticed. A failure in any of the processes involved in conscious detection (encoding the pre-change display, maintenance of that information within working memory, and comparison of the pre and post change displays) can lead to change blindness. Given that unnoticed visual changes in a scene can be easily detected once attention is drawn to them, it has been suggested that attention plays an important role on visual awareness...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28270589/coding-of-spatial-attention-priorities-and-object-features-in-the-macaque-lateral-intraparietal-cortex
#16
Ekaterina Levichkina, Yuri B Saalmann, Trichur R Vidyasagar
Primate posterior parietal cortex (PPC) is known to be involved in controlling spatial attention. Neurons in one part of the PPC, the lateral intraparietal area (LIP), show enhanced responses to objects at attended locations. Although many are selective for object features, such as the orientation of a visual stimulus, it is not clear how LIP circuits integrate feature-selective information when providing attentional feedback about behaviorally relevant locations to the visual cortex. We studied the relationship between object feature and spatial attention properties of LIP cells in two macaques by measuring the cells' orientation selectivity and the degree of attentional enhancement while performing a delayed match-to-sample task...
March 2017: Physiological Reports
https://www.readbyqxmd.com/read/28264099/temporal-binding-window-of-the-sound-induced-flash-illusion-in-amblyopia
#17
Cindy Narinesingh, Herbert C Goltz, Agnes M F Wong
Purpose: Amblyopia is a neurodevelopmental visual disorder caused by abnormal visual experience in childhood. In addition to known visual deficits, there is evidence for changes in audiovisual integration in amblyopia using explicit tasks. We examined audiovisual integration in amblyopia using an implicit task that is more relevant in a real-world context. Methods: A total of 11 participants with amblyopia and 16 controls were tested binocularly and monocularly on the sound-induced flash illusion, in which flashes and beeps are presented concurrently and the perceived number of flashes is influenced by the number of beeps...
March 1, 2017: Investigative Ophthalmology & Visual Science
https://www.readbyqxmd.com/read/28261131/visual-working-memory-capacity-can-be-increased-by-training-on-distractor-filtering-efficiency
#18
Cui-Hong Li, Xu He, Yu-Juan Wang, Zhe Hu, Chun-Yan Guo
It is generally considered that working memory (WM) capacity is limited and that WM capacity affects cognitive processes. Distractor filtering efficiency has been suggested to be an important factor in determining the visual working memory (VWM) capacity of individuals. In the present study, we investigated whether training in visual filtering efficiency (FE) could improve VWM capacity, as measured by performance on the change detection task (CDT) and changes of contralateral delay activity (CDA) (contralateral delay activity) of different conditions, and evaluated the transfer effect of visual FE training on verbal WM and fluid intelligence, as indexed by performance on the verbal WM span task and Raven's Standard Progressive Matrices (RSPM) test, respectively...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28258438/clinical-application-of-eye-movement-tasks-as-an-aid-to-understanding-parkinson-s-disease-pathophysiology
#19
REVIEW
Kikuro Fukushima, Junko Fukushima, Graham R Barnes
Parkinson's disease (PD) is a progressive neurodegenerative disorder of the basal ganglia. Most PD patients suffer from somatomotor and oculomotor disorders. The oculomotor system facilitates obtaining accurate information from the visual world. If a target moves slowly in the fronto-parallel plane, tracking eye movements occur that consist primarily of smooth-pursuit interspersed with corrective saccades. Efficient smooth-pursuit requires appropriate target selection and predictive compensation for inherent processing delays...
March 3, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28254613/speeded-saccadic-and-manual-visuo-motor-decisions-distinct-processes-but-same-principles
#20
Aline Bompas, Craig Hedge, Petroc Sumner
Action decisions are considered an emergent property of competitive response activations. As such, decision mechanisms are embedded in, and therefore may differ between, different response modalities. Despite this, the saccadic eye movement system is often promoted as a model for all decisions, especially in the fields of electrophysiology and modelling. Other research traditions predominantly use manual button presses, which have different response distribution profiles and are initiated by different brain areas...
February 27, 2017: Cognitive Psychology
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