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Saccadic memory

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https://www.readbyqxmd.com/read/29451118/a-spatial-memory-signal-shows-that-the-parietal-cortex-has-access-to-a-craniotopic-representation-of-space
#1
Mulugeta Semework, Sara C Steenrod, Michael E Goldberg
Humans effortlessly establish a gist-like memory of their environment whenever they enter a new place, a memory that can guide action even in the absence of vision. Neurons in the lateral intraparietal area (LIP) of the monkey exhibit a form of this environmental memory. These neurons respond when a monkey makes a saccade that brings the spatial location of a stimulus that appeared on a number of prior trials, but not on the present trial, into their receptive fields (RFs). The stimulus need never have appeared in the neuron's RF...
February 16, 2018: ELife
https://www.readbyqxmd.com/read/29450807/an-eye-fixation-related-potential-study-in-two-reading-tasks-reading-to-memorize-and-reading-to-make-a-decision
#2
Aline Frey, Benoît Lemaire, Laurent Vercueil, Anne Guérin-Dugué
We investigated how two different reading tasks, namely reading to memorize [Read & Memorize (RM)] and reading to decide whether a text was relevant to a given topic [Read & Decide (RD)], modulated both eye movements (EM) and brain activity. To this end, we set up an ecological paradigm using the eye fixation-related potentials (EFRP) technique, in which participants freely moved their eyes to process short paragraphs, while their electroencephalography (EEG) activity was recorded in synchronization with their EM...
February 15, 2018: Brain Topography
https://www.readbyqxmd.com/read/29434540/perceptual-color-space-representations-in-the-oculomotor-system-are-modulated-by-surround-suppression-and-biased-selection
#3
Devin H Kehoe, Maryam Rahimi, Mazyar Fallah
The oculomotor system utilizes color extensively for planning saccades. Therefore, we examined how the oculomotor system actually encodes color and several factors that modulate these representations: attention-based surround suppression and inherent biases in selecting and encoding color categories. We measured saccade trajectories while human participants performed a memory-guided saccade task with color targets and distractors and examined whether oculomotor target selection processing was functionally related to the CIE (x,y) color space distances between color stimuli and whether there were hierarchical differences between color categories in the strength and speed of encoding potential saccade goals...
2018: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/29432778/-looking-at-nothing-during-sequential-sensorimotor-actions-long-term-memory-based-eye-scanning-of-remembered-target-locations
#4
Rebecca M Foerster
Before acting humans saccade to a target object to extract relevant visual information. Even when acting on remembered objects, locations previously occupied by relevant objects are fixated during imagery and memory tasks - a phenomenon called "looking-at-nothing". While looking-at-nothing was robustly found in tasks encouraging declarative memory built-up, results are mixed in the case of procedural sensorimotor tasks. Eye-guidance to manual targets in complete darkness was observed in a task practiced for days beforehand, while investigations using only a single session did not find fixations to remembered action targets...
February 9, 2018: Vision Research
https://www.readbyqxmd.com/read/29406885/preliminary-evidence-of-the-cerebellar-role-on-cognitive-performances-in-clinically-isolated-syndrome
#5
Amandine Moroso, Aurélie Ruet, Delphine Lamargue-Hamel, Fanny Munsch, Mathilde Deloire, Jean-Christophe Ouallet, Stéphanie Cubizolle, Julie Charré-Morin, Aurore Saubusse, Thomas Tourdias, Vincent Dousset, Bruno Brochet
BACKGROUND: Cerebellar and cognitive dysfunction can occur early in clinically isolated syndrome (CIS). Eye tracking is a reliable tool for the evaluation of both subtle cerebellar symptoms and cognitive impairment. OBJECTIVES: To investigate the early cognitive profile using neuropsychological and ocular motor (OM) testing in CIS with and without cerebellar dysfunction with OM testing compared to healthy subjects (HS). METHODS: Twenty-eight patients and 12 HC underwent OM and neuropsychological testing...
February 15, 2018: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/29372362/large-scale-traveling-waves-in-eeg-activity-following-eye-movement
#6
Marcello Giannini, David M Alexander, Andrey R Nikolaev, Cees van Leeuwen
In spontaneous, stimulus-evoked, and eye-movement evoked EEG, the oscillatory signal shows large scale, dynamically organized patterns of phase. We investigated eye-movement evoked patterns in free-viewing conditions. Participants viewed photographs of natural scenes in anticipation of a memory test. From 200 ms intervals following saccades, we estimated the EEG phase gradient over the entire scalp, and the wave activity, i.e. the goodness of fit of a wave model involving a phase gradient assumed to be smooth over the scalp...
January 25, 2018: Brain Topography
https://www.readbyqxmd.com/read/29364069/the-signature-of-undetected-change-an-exploratory-electrotomographic-investigation-of-gradual-change-blindness
#7
John Emmanuel Kiat, Michael D Dodd, Robert F Belli, Jacob E Cheadle
Neuroimaging based investigations of change blindness, a phenomenon in which seemingly obvious changes in visual scenes fail to be detected, have significantly advanced our understanding of visual awareness. The vast majority of prior investigations, however, utilize paradigms involving visual disruptions (e.g. intervening blank screens, saccadic movements, "mudsplashes"), making it difficult to cleanly isolate neural responses towards undetected visual changes. To address this issue in this present study, high-density EEG data (256 channel) was collected from 25 participants using a paradigm in which visual changes were progressively introduced into detailed real-world scenes without the use of visual disruption...
January 24, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29348583/rapid-updating-of-spatial-working-memory-across-saccades
#8
Paul J Boon, Silvia Zeni, Jan Theeuwes, Artem V Belopolsky
Each time we make an eye movement, positions of objects on the retina change. In order to keep track of relevant objects their positions have to be updated. The situation becomes even more complex if the object is no longer present in the world and has to be held in memory. In the present study, we used saccadic curvature to investigate the time-course of updating a memorized location across saccades. Previous studies have shown that a memorized location competes with a saccade target for selection on the oculomotor map, which leads to saccades curving away from it...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29327042/transsaccadic-memory-of-multiple-spatially-variant-and-invariant-object-features
#9
Jerrold Jeyachandra, Yoongoo Nam, YoungWook Kim, Gunnar Blohm, Aarlenne Z Khan
Transsaccadic memory is a process by which remembered object information is updated across a saccade. To date, studies on transsaccadic memory have used simple stimuli-that is, a single dot or feature of an object. It remains unknown how transsaccadic memory occurs for more realistic, complex objects with multiple features. An object's location is a central feature for transsaccadic updating, as it is spatially variant, but other features such as size are spatially invariant. How these spatially variant and invariant features of an object are remembered and updated across saccades is not well understood...
January 1, 2018: Journal of Vision
https://www.readbyqxmd.com/read/29321562/perception-during-double-step-saccades
#10
E Zimmermann, M C Morrone, P Binda
How the visual system achieves perceptual stability across saccadic eye movements is a long-standing question in neuroscience. It has been proposed that an efference copy informs vision about upcoming saccades, and this might lead to shifting spatial coordinates and suppressing image motion. Here we ask whether these two aspects of visual stability are interdependent or may be dissociated under special conditions. We study a memory-guided double-step saccade task, where two saccades are executed in quick succession...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29295669/effects-of-handedness-consistency-and-saccade-execution-on-eyewitness-memory-in-cued-and-free-recall-procedures
#11
Keith B Lyle
Identifying characteristics that distinguish between people with relatively good versus poor episodic memory is an important goal of eyewitness-memory research, as is identifying activities that can improve people's ability to retrieve episodic memories. Consistency of hand preference is a trait associated with the quality of people's episodic memory and repetitive saccade execution is an activity known to improve people's ability to retrieve episodic memories. These factors were examined in relation to cued and free recall of a staged criminal event...
January 2, 2018: Memory
https://www.readbyqxmd.com/read/29275124/effects-of-saccade-induced-retrieval-enhancement-on-conceptual-and-perceptual-tests-of-explicit-implicit-memory
#12
Andrew Parker, Daniel Powell, Neil Dagnall
The effects of saccadic horizontal (bilateral) eye movements upon tests of both conceptual and perceptual forms of explicit and implicit memory were investigated. Participants studied a list of words and were then assigned to one of four test conditions: conceptual explicit, conceptual implicit, perceptual explicit, or perceptual implicit. Conceptual tests comprised category labels with either explicit instructions to recall corresponding examples from the study phase (category-cued recall), or implicit instructions to generate any corresponding examples that spontaneously came to mind (category-exemplar generation)...
March 2018: Brain and Cognition
https://www.readbyqxmd.com/read/29246747/tms-over-posterior-parietal-cortex-disrupts-trans-saccadic-visual-stability
#13
Thérèse Collins, Pierre O Jacquet
BACKGROUND: Saccadic eye movements change the retinal location of visual objects, but we do not experience the visual world as constantly moving, we perceive it as seamless and stable. This visual stability may be achieved by an internal or efference copy of each saccade that, combined with the retinal information, allows the visual system to cancel out or ignore the self-caused retinal motion. OBJECTIVE: The current study investigated the underlying brain mechanisms responsible for visual stability in humans with online transcranial magnetic stimulation (TMS)...
November 29, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/29240758/increased-gamma-band-activity-for-lateral-interactions-in-humans
#14
Alon Shapira, Anna Sterkin, Moshe Fried, Oren Yehezkel, Zeev Zalevsky, Uri Polat
Collinear facilitation of contrast sensitivity supported by lateral interactions within primary visual cortex is implicated in contour and object perception, with neural correlates in several frequency bands. Although higher component of the ERP power spectrum, the gamma-band, is postulated to reflect object representation, attention and memory, its neuronal source has been questioned, suggesting it is an artifact reflecting saccadic eye movements. Here we explored the gamma-band activity during collinear facilitation with no saccade-related confounds...
2017: PloS One
https://www.readbyqxmd.com/read/29231021/-eye-movement-characteristics-of-cooperation-degree-during-image-completion-test-in-psychiatric-impairment-assessment
#15
J J Wang, C Liu, L Liu, S Y Zhang, H Z Li, W X Cai
OBJECTIVES: To explore the difference of eye movement characteristics between uncooperative and cooperative subjects with mental disorder after cerebral trauma. METHODS: Thirty-nine subjects which needed psychiatric impairment assessment were selected. According to the binomial forced-choice digit memory test (BFDMT), all subjects were divided into cooperative and uncooperative groups. The subjects were asked to take the image completion test from Wechsler adult intelligence scale...
April 2017: Fa Yi Xue za Zhi
https://www.readbyqxmd.com/read/29230169/eye-gaze-and-aging-selective-and-combined-effects-of-working-memory-and-inhibitory-control
#16
Trevor J Crawford, Eleanor S Smith, Donna M Berry
Eye-tracking is increasingly studied as a cognitive and biological marker for the early signs of neuropsychological and psychiatric disorders. However, in order to make further progress, a more comprehensive understanding of the age-related effects on eye-tracking is essential. The antisaccade task requires participants to make saccadic eye movements away from a prepotent stimulus. Speculation on the cause of the observed age-related differences in the antisaccade task largely centers around two sources of cognitive dysfunction: inhibitory control (IC) and working memory (WM)...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29223864/involuntary-top-down-control-by-search-irrelevant-features-visual-working-memory-biases-attention-in-an-object-based-manner
#17
Rebecca M Foerster, Werner X Schneider
Many everyday tasks involve successive visual-search episodes with changing targets. Converging evidence suggests that these targets are retained in visual working memory (VWM) and bias attention from there. It is unknown whether all or only search-relevant features of a VWM template bias attention during search. Bias signals might be configured exclusively to task-relevant features so that only search-relevant features bias attention. Alternatively, VWM might maintain objects in the form of bound features...
December 7, 2017: Cognition
https://www.readbyqxmd.com/read/29163352/parahippocampal-involvement-in-mesial-temporal-lobe-epilepsy-with-hippocampal-sclerosis-a-proof-of-concept-from-memory-guided-saccades
#18
Silvia Colnaghi, Giorgio Beltrami, Guy Poloni, Anna Pichiecchio, Stefano Bastianello, Carlo Andrea Galimberti, Maurizio Versino
Objective: Mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS) may involve extrahippocampal areas of structural damage and dysfunction. The accuracy of medium-term spatial memory can be tested by memory-guided saccades (MGS) to evaluate a functional impairment of the parahippocampal cortex (PHC), while voxel-based morphometry (VBM) analysis can be used to detect a structural damage of the latter region. Methods: MGS with 3- and 30-s memorization delays were compared between 7 patients affected by right MTLE-HS (r-MTLE-HS), 6 patients affected by left MTLE-HS, and 13 healthy controls...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29162899/remapping-high-capacity-pre-attentive-fragile-sensory-memory
#19
Paul Zerr, Surya Gayet, Kees Mulder, Yaïr Pinto, Ilja Sligte, Stefan Van der Stigchel
Humans typically make several saccades per second. This provides a challenge for the visual system as locations are largely coded in retinotopic (eye-centered) coordinates. Spatial remapping, the updating of retinotopic location coordinates of items in visuospatial memory, is typically assumed to be limited to robust, capacity-limited and attention-demanding working memory (WM). Are pre-attentive, maskable, sensory memory representations (e.g. fragile memory, FM) also remapped? We directly compared trans-saccadic WM (tWM) and trans-saccadic FM (tFM) in a retro-cue change-detection paradigm...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29159799/memory-for-retinotopic-locations-is-more-accurate-than-memory-for-spatiotopic-locations-even-for-visually-guided-reaching
#20
Anna Shafer-Skelton, Julie D Golomb
To interact successfully with objects, we must maintain stable representations of their locations in the world. However, their images on the retina may be displaced several times per second by large, rapid eye movements. A number of studies have demonstrated that visual processing is heavily influenced by gaze-centered (retinotopic) information, including a recent finding that memory for an object's location is more accurate and precise in gaze-centered (retinotopic) than world-centered (spatiotopic) coordinates (Golomb & Kanwisher, 2012b)...
November 20, 2017: Psychonomic Bulletin & Review
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