scholarly journals Spatial Memory Following Shifts of Gaze. I. Saccades to Memorized World-Fixed and Gaze-Fixed Targets

2003 ◽  
Vol 89 (5) ◽  
pp. 2564-2576 ◽  
Author(s):  
Justin T. Baker ◽  
Timothy M. Harper ◽  
Lawrence H. Snyder
Keyword(s):  
Reference Frame ◽  
Smooth Pursuit ◽  
Spatial Working Memory ◽  
Whole Body ◽  
Visually Guided ◽  
Gaze Shift ◽  
Representational System ◽  
The World ◽  
Spatial Locations ◽  
Sequence Characteristics

During a shift of gaze, an object can move along with gaze or stay fixed in the world. To examine the effect of an object's reference frame on spatial working memory, we trained monkeys to memorize locations of visual stimuli as either fixed in the world or fixed to gaze. Each trial consisted of an initial reference frame instruction, followed by a peripheral visual flash, a memory-period gaze shift, and finally a memory-guided saccade to the location consistent with the instructed reference frame. The memory-period gaze shift was either rapid (a saccade) or slow (smooth pursuit or whole body rotation). This design allowed a comparison of memory-guided saccade performance under various conditions. Our data indicate that after a rotation or smooth-pursuit eye movement, saccades to memorized world-fixed targets are more variable than saccades to memorized gaze-fixed targets. In contrast, memory-guided saccades to world- and gaze-fixed targets are equally variable following a visually guided saccade. Across all conditions, accuracy, latency, and main sequence characteristics of memory-guided saccades are not influenced by the target's reference frame. Memory-guided saccades are, however, more accurate after fast compared with slow gaze shifts. These results are most consistent with an eye-centered representational system for storing the spatial locations of memorized objects but suggest that the visual system may engage different mechanisms to update the stored signal depending on how gaze is shifted.

II. The Question of God in the Struggle for Racial Justice

Horizons ◽  
2021 ◽  
Vol 48 (1) ◽  
pp. 172-194
Author(s):  
Christopher Pramuk
Keyword(s):  
Human Freedom ◽  
Whole Body ◽  
Racial Justice ◽  
The Earth ◽  
The World ◽  
The Face

In March 1943, having narrowly escaped Europe three years earlier, Abraham Joshua Heschel published “The Meaning of This War,” his first essay in an American publication. The essay shows, quite remarkably, his full command of literary English. It also shows, as biographer Edward Kaplan remarks, that Heschel “had found his militant voice.” “Emblazoned over the gates of the world in which we live,” the essay begins, “is the escutcheon of the demons. The mark of Cain in the face of man has come to overshadow the likeness of God. There have never been so much guilt and distress, agony and terror. At no time has the earth been so soaked with blood.” Heschel's extraordinary life's witness, his whole body of work, traverses precisely this anthropological and theological knife's edge: The mark of Cain in the face of man has come to overshadow the likeness of God. Where is God? Or better, Who is God? in relation to the rapacious misuse and idolatrous distortion of human freedom? Or simply, Is God?

Prefrontal Cortical Representation of Visuospatial Working Memory in Monkeys Examined by Local Inactivation With Muscimol

2001 ◽  
Vol 86 (4) ◽  
pp. 2041-2053 ◽  
Author(s):  
Toshiyuki Sawaguchi ◽  
Michiyo Iba
Keyword(s):  
Working Memory ◽  
Functional Organization ◽  
Visual Fields ◽  
Local Injection ◽  
Delayed Response ◽  
Visually Guided ◽  
Visuospatial Working Memory ◽  
Prefrontal Cortical ◽  
Response Task ◽  
Spatial Locations

In primates, dorsolateral areas of the prefrontal cortex (PFC) play a major role in visuospatial working memory. To examine the functional organization of the PFC for representing visuospatial working memory, we produced reversible local inactivation, with the local injection of muscimol (5 μg, 1 μl), at various sites ( n = 100) in the dorsolateral PFC of monkeys and observed the behavioral consequences in an oculomotor delayed-response task that required memory-guided saccades for locations throughout both visual fields. At 82 sites, the local injection of muscimol induced deficits in memory-guided saccades to a few specific, usually contralateral, target locations that varied with the location of the injection site. Such deficits depended on the delay length, and longer delays were associated with larger deficits in memory-guided saccades. The injection sites and affected spatial locations of the target showed a gross topographical relationship. No deficits appeared for a control task in which the subject was required to make a visually guided saccade to a visible target. These findings suggest that a specific site in the dorsolateral PFC is responsible for the working memory process for a specific visuospatial coordinate to guide goal-directed behavior. Further, memoranda for specific visuospatial coordinates appear to be represented in a topographical memory mapwithin the dorsolateral PFC to represent visuospatial working memory processes.

scholarly journals Synesthesia: From Cross-Modal to Modality-Free Learning and Knowledge

Leonardo ◽  
2015 ◽  
Vol 48 (1) ◽  
pp. 48-54 ◽  
Author(s):  
Roy Williams ◽  
Simone Gumtau ◽  
Jenny Mackness
Keyword(s):  
Case Studies ◽  
Perception And Action ◽  
Action Learning ◽  
Whole Body ◽  
Learning Design ◽  
Autistic Spectrum ◽  
Enactive Perception ◽  
The World ◽  
Innovative Learning ◽  
The Senses

In an integrated view of perception and action, learning involves all the senses, their interaction and cross-modality, rather than multi-modality alone. This can be referred to as synesthetic enactive perception, which forms the basis for more abstract, modality-free knowledge and a potential underpinning for innovative learning design. The authors explore this mode of learning in two case studies: The first focuses on children in Montessori preschools and the second on MEDIATE, an interactive space designed for children on the autistic spectrum that offers a “whole-body” engagement with the world.

scholarly journals Saccades and smooth pursuit eye movements trigger equivalent gaze-cued orienting effects

2018 ◽  
Vol 71 (9) ◽  
pp. 1860-1872 ◽  
Author(s):  
Stephen RH Langton ◽  
Alex H McIntyre ◽  
Peter JB Hancock ◽  
Helmut Leder
Keyword(s):  
Eye Movements ◽  
Smooth Pursuit ◽  
Target Location ◽  
Eye Gaze ◽  
Saccadic Eye Movements ◽  
Gaze Shift ◽  
The Gaze ◽  
Orienting Effect ◽  
Motion Speed ◽  
Uncued Target

Research has established that a perceived eye gaze produces a concomitant shift in a viewer’s spatial attention in the direction of that gaze. The two experiments reported here investigate the extent to which the nature of the eye movement made by the gazer contributes to this orienting effect. On each trial in these experiments, participants were asked to make a speeded response to a target that could appear in a location toward which a centrally presented face had just gazed (a cued target) or in a location that was not the recipient of a gaze (an uncued target). The gaze cues consisted of either fast saccadic eye movements or slower smooth pursuit movements. Cued targets were responded to faster than uncued targets, and this gaze-cued orienting effect was found to be equivalent for each type of gaze shift both when the gazes were un-predictive of target location (Experiment 1) and counterpredictive of target location (Experiment 2). The results offer no support for the hypothesis that motion speed modulates gaze-cued orienting. However, they do suggest that motion of the eyes per se, regardless of the type of movement, may be sufficient to trigger an orienting effect.

scholarly journals Cryogenic technologies in biology and medicine

2020 ◽  
Vol 2020 (2b) ◽  
pp. 129-134
Author(s):  
O.I. Ossetsky ◽  
◽  
O.S. Snurnikov ◽  
Keyword(s):  
Public Health ◽  
Food Industry ◽  
Raw Materials ◽  
Biologically Active ◽  
Whole Body ◽  
Active Ingredients ◽  
Lipid Fractions ◽  
The World ◽  
New Generation

Cryogenic technologies in biology and medicine Current tendencies of the development of cryogenic technologies in the world practice and in Ukraine have been comparatively analyzed. A special attention has been paid to cryotechnologies in biology and medicine. The features of deriving the biologically active ingredients of natural raw materials by means of cryosublimation fractionation and extraction of lipid fractions with liquefied refrigerants, as well as perspectives of their application when obtaining the products of new generation in pharmacy, cosmetics, food industry have been considered. There were discussed the possibilities of human whole body extreme cryotherapy. Main aspects of its usage in practical public health have been considered.

scholarly journals Moving with the Screen on Zoom: Reconnecting with Bodily and Environmental Awareness

2021 ◽  
Vol 12 ◽  
Author(s):  
Claire Loussouarn
Keyword(s):  
Environmental Awareness ◽  
Physical Space ◽  
Whole Body ◽  
The World

Rather than seeing Zoom as a replacement for practicing movement and dance in a shared physical space, I propose to consider our relationship with the screen on Zoom as a movement in its own right. Using my experience of teaching movement on Zoom, I ask how we can connect with another via the screen without losing awareness of our bodies and the space which we're in. I argue that Zoom is a place of 'moving selfies' in dialogue where we can engage critically with the screen by practicing seeing with the whole body and moving with diffuse awareness and where we can critically reflect on our own habits of framing the world and its biases.

Chinese Peasants and the Closed Community: An Open and Shut Case

1971 ◽  
Vol 13 (3) ◽  
pp. 270-281 ◽  
Author(s):  
G. William Skinner
Keyword(s):  
Whole Body ◽  
Chinese Society ◽  
Mediterranean World ◽  
The World ◽  
The Mediterranean

Our repertoire of concepts and theories concerning peasantries has been built up through contributions from scholars working in many parts of the world. Latin Americanists and India-wallahs, in particular, have played a major role in the development of models, but we have also heard from specialists in Indonesia, Japan, Europe, the Mediterranean world, and even Africa. But where is China in all this ? Why are students of the world's largest peasantry silent? In part, it is because we are so few and too preoccupied with our own peasants to have time for anybody else's. More to the point, however, the whole body of inherited anthropological wisdom concerning peasantries seems somehow alien and irrelevant to students of Chinese society.

Letter to the Editor

PEDIATRICS ◽  
1994 ◽  
Vol 94 (6) ◽  
pp. 963-964
Author(s):  
Virginia L. Richmond
Keyword(s):  
Nutritional Status ◽  
World Health Organization ◽  
Oral Rehydration Solution ◽  
World Health ◽  
Whole Body ◽  
Childhood Diarrhea ◽  
Oral Rehydration ◽  
The World ◽  
Rehydration Solution ◽  
Health Organization

The article by Jacobs et al1 regarding treatment of acute childhood diarrhea with homeopathic medicine as an adjunct to the World Health Organization Oral Rehydration Solution (ORS) omits some essential measurements needed for comparison with previous literature reports and pertinent references from the last 15 years. The authors ignored the whole body of literature on rice- or cereal-based ORS (CB-ORS) that dealt with much larger patient samples and more precise measurements.2 These reports empha-sized the variability of results depending on the previous nutritional status of the child and whether adequate, nutritious diets were actually given the child on early refeeding.3

A Neural Network Model of Flexible Spatial Updating

2004 ◽  
Vol 91 (4) ◽  
pp. 1608-1619 ◽  
Author(s):  
Robert L. White ◽  
Lawrence H. Snyder
Keyword(s):  
Neural Network ◽  
Reference Frame ◽  
Spatial Information ◽  
Target Location ◽  
Target Position ◽  
Spatial Location ◽  
Spatial Updating ◽  
Gaze Shift ◽  
Fixed Reference ◽  
Gaze Position

Neurons in many cortical areas involved in visuospatial processing represent remembered spatial information in retinotopic coordinates. During a gaze shift, the retinotopic representation of a target location that is fixed in the world (world-fixed reference frame) must be updated, whereas the representation of a target fixed relative to the center of gaze (gaze-fixed) must remain constant. To investigate how such computations might be performed, we trained a 3-layer recurrent neural network to store and update a spatial location based on a gaze perturbation signal, and to do so flexibly based on a contextual cue. The network produced an accurate readout of target position when cued to either reference frame, but was less precise when updating was performed. This output mimics the pattern of behavior seen in animals performing a similar task. We tested whether updating would preferentially use gaze position or gaze velocity signals, and found that the network strongly preferred velocity for updating world-fixed targets. Furthermore, we found that gaze position gain fields were not present when velocity signals were available for updating. These results have implications for how updating is performed in the brain.

scholarly journals How Humean is Bohumianism?

2020 ◽  
Vol 50 (10) ◽  
pp. 1171-1188
Author(s):  
Tomasz Bigaj ◽  
Antonio Vassallo
Keyword(s):  
Spatial Configuration ◽  
Bohmian Mechanics ◽  
Prima Facie ◽  
Intrinsic Properties ◽  
The World ◽  
Pros And Cons ◽  
Spatial Locations ◽  
The Universe ◽  
Necessary Connections ◽  
Humean Principle

Abstract An important part of the influential Humean doctrine in philosophy is the supervenience principle (sometimes referred to as the principle of separability). This principle asserts that the complete state of the world supervenes on the intrinsic properties of its most fundamental components and their spatiotemporal relations (the so-called Humean mosaic). There are well-known arguments in the literature purporting to show that in quantum mechanics the Humean supervenience principle is violated, due to the existence of entangled states. Recently, however, arguments have been presented to the effect that the supervenience principle can be defended in Bohmian mechanics. The key element of this strategy lies in the observation that according to Bohmian mechanics the fundamental facts about particles are facts about their spatial locations, and moreover, for any proper subsystem of the world its state may non-trivially depend on the spatial configuration of the rest of the universe. Thus quantum-mechanical states of subsystems do not represent their intrinsic properties but rather characterize their relations with the environment. In this paper we point out the worry that this Bohmian strategy—known as Bohumianism—saves the letter but not the spirit of the Humean doctrine of supervenience, since it prima facie violates another seemingly important Humean principle, which we call Strong Supervenience and whose denial implies the existence of necessary connections among distinct individuals. We argue that the best defense for Bohumians is to question the fundamental existence of complex physical systems and their states by treating any reference to them as a convenient description of the underlying collection of Bohmian particles. We consider several pros and cons of this strategy.

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