The complex interplay between three-dimensional egocentric and allocentric spatial representation

2013 ◽  
Vol 36 (5) ◽  
pp. 553-554 ◽  
Author(s):  
David M. Kaplan
Keyword(s):  
Embodied Cognition ◽  
Recent Work ◽  
Spatial Representation ◽  
Three Dimensional ◽  
Complex Interplay ◽  
Behavioral Evidence

AbstractJeffery et al. characterize the egocentric/allocentric distinction as discrete. But paradoxically, much of the neural and behavioral evidence they adduce undermines a discrete distinction. More strikingly, their positive proposal – the bicoded map hypothesis – reflects a more complex interplay between egocentric and allocentric coding than they acknowledge. Properly interpreted, their proposal about three-dimensional spatial representation contributes to recent work on embodied cognition.

Greek Slave Systems in their Eastern Mediterranean Context, c.800-146 BC

2018 ◽  
Author(s):  
David M. Lewis
Keyword(s):  
Recent Work ◽  
Eastern Mediterranean ◽  
Demographic Variables ◽  
Archaic Period ◽  
Ancient World ◽  
Complex Interplay ◽  
Cultural Economic ◽  
Early Archaic ◽  
Mediterranean World ◽  
Orthodox View

The orthodox view of ancient Mediterranean slavery holds that Greece and Rome were the only ‘genuine slave societies’ of the ancient world, that is, societies in which slave labour contributed significantly to the economy and underpinned the wealth of elites. Other societies, labelled as ‘societies with slaves’, apparently made little use of slave labour, and have therefore been largely ignored in recent work. Greek Slave Systems in their Eastern Mediterranean Context, c.800–146 BC presents a radically different view. Slavery was indeed particularly highly developed in Greece and Rome; but it was also highly developed in Carthage and other parts of the Eastern Mediterranean, and played a not insignificant role in the affairs of elites in Assyria, Babylonia, and Persia. This new study portrays the Eastern Mediterranean world as a patchwork of regional slave systems. In Greece, diversity was the rule: from the early archaic period onwards, differing historical trajectories in various regions shaped the institution of slavery in manifold ways, producing very different slave systems in regions such as Sparta, Crete, and Attica. In the wider Eastern Mediterranean world, we find a similar level of diversity. Slavery was exploited to different degrees across all of these regions, and was the outcome of a complex interplay between cultural, economic, political, geographic, and demographic variables.

Kant’s Mereological Account of Greater and Lesser Actual Infinities

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Daniel Smyth
Keyword(s):  
Recent Work ◽  
Spatial Representation ◽  
Actual Infinity

Abstract Recent work on Kant’s conception of space has largely put to rest the view that Kant is hostile to actual infinity. Far from limiting our cognition to quantities that are finite or merely potentially infinite, Kant characterizes the ground of all spatial representation as an actually infinite magnitude. I advance this reevaluation a step further by arguing that Kant judges some actual infinities to be greater than others: he claims, for instance, that an infinity of miles is strictly smaller than an infinity of earth-diameters. This inequality follows from Kant’s mereological conception of magnitudes (quanta): the part is (analytically) less than the whole, and an infinity of miles is equal to only a part of an infinity of earth-diameters. This inequality does not, however, imply that Kant’s infinities have transfinite and unequal sizes (quantitates). Because Kant’s conception of size (quantitas) is based on the Eudoxian theory of proportions, infinite magnitudes (quanta) cannot be assigned exact sizes. Infinite magnitudes are immeasurable, but some are greater than others.

Recent Developments in the Evolution of Morphologies and Controllers for Physically Simulated Creatures

2001 ◽  
Vol 7 (1) ◽  
pp. 77-87 ◽  
Author(s):  
Tim Taylor ◽  
Colm Massey
Keyword(s):  
Recent Work ◽  
Original Work ◽  
Three Dimensional ◽  
Parallel Computer ◽  
Connection Machine ◽  
Recent Developments ◽  
Body Shapes

Karl Sims' work [25, 26] on evolving body shapes and controllers for three-dimensional, physically simulated creatures generated wide interest on its publication in 1994. The purpose of this article is threefold: (a) to highlight a spate of recent work by a number of researchers in replicating, and in some cases extending, Sims' results using standard PCs (Sims' original work was done on a Connection Machine CM-5 parallel computer). In particular, a re-implementation of Sims' work by the authors will be described and discussed; (b) to illustrate how off-the-shelf physics engines can be used in this sort of work, and also to highlight some deficiencies of these engines and pitfalls when using them; and (c) to indicate how these recent studies stand in respect to Sims' original work.

Creating metaphor in context

2014 ◽  
Vol 1 (1) ◽  
pp. 21-41 ◽  
Author(s):  
Zoltán Kövecses
Keyword(s):  
Embodied Cognition ◽  
Recent Work ◽  
Contextual Factors ◽  
Systems Change ◽  
Conceptual System ◽  
Major Goal ◽  
Conceptual Systems ◽  
Cognitive Linguistic ◽  
Cognitive Operations ◽  
Universal Nature

The issue of context has been, in the main, neglected in cognitive linguistic and much other work on how conceptual systems change and vary. In most recent work on conceptual systems, the issues of embodied cognition and the universal nature of cognitive operations have been emphasized. By contrast, my major goal in this paper is to attempt to characterize some of the contextual factors that are involved in shaping the conceptual system. My focus will be on metaphorical concepts, as well as on the interaction between metaphorical aspects of the conceptual system and contextual factors. I also suggest that the different conceptual factors do not mechanically and automatically lead to differences in the metaphorical conceptualization of a concept. Instead, they can affect non-metaphorical aspects of concepts.

scholarly journals The Mechanism of Branching of Three-Dimensional Periodic Orbits from the Plane

1983 ◽  
Vol 74 ◽  
pp. 213-224
Author(s):  
I.A. Robin ◽  
V.V. Markellos
Keyword(s):  
Recent Work ◽  
Periodic Orbits ◽  
Restricted Problem ◽  
Three Dimensional ◽  
General Situation ◽  
Orbital Symmetry ◽  
Resonant Orbits ◽  
Symmetry Properties ◽  
Elliptic Restricted Problem ◽  
Symmetric Periodic Orbits

AbstractA linearised treatment is presented of vertical bifurcations of symmetric periodic orbits(bifurcations of plane with three-dimensional orbits) in the circular restricted problem. Recent work on bifurcations from vertical-critical orbits (av = ±1) is extended to deal with the v more general situation of bifurcations from vertical self-resonant orbits (av = cos(2Πn/m) for integer m,n) and it is shown that in this more general case bifurcating families of three-dimensional orbits always occur in pairs, the orbital symmetry properties being governed by the evenness or oddness of the integer m. The applicability of the theory to the elliptic restricted problem is discussed.

Double trouble for Gestalt Bubbles

2003 ◽  
Vol 26 (4) ◽  
pp. 417-418
Author(s):  
Dan Lloyd
Keyword(s):  
Spatial Representation ◽  
Three Dimensional ◽  
Spatial Properties ◽  
The Brain

The “Gestalt Bubble” model of Lehar is not supported by the evidence offered. The author invalidly concludes that spatial properties in experience entail an explicit volumetric spatial representation in the brain. The article also exaggerates the extent to which phenomenology reveals a completely three-dimensional scene in perception.

scholarly journals Disembodying cognition

2010 ◽  
Vol 2 (1) ◽  
pp. 79-116 ◽  
Author(s):  
Anjan Chatterjee
Keyword(s):  
Embodied Cognition ◽  
Recent Work ◽  
Cognitive Neuroscience ◽  
Real World ◽  
Grounded Cognition ◽  
Perceptual Information ◽  
Knowing How ◽  
Neuronal Ensembles ◽  
Sensory Motor ◽  
Motor Information

AbstractThe idea that concepts are embodied by our motor and sensory systems is popular in current theorizing about cognition. Embodied cognition accounts come in different versions and are often contrasted with a purely symbolic amodal view of cognition. Simulation, or the hypothesis that concepts simulate the sensory and motor experience of real world encounters with instances of those concepts, has been prominent in psychology and cognitive neuroscience. Here, with a focus on spatial thought and language, I review some of the evidence cited in support of simulation versions of embodied cognition accounts. While these data are extremely interesting and many of the experiments are elegant, knowing how to best interpret the results is often far from clear. I point out that a quick acceptance of embodied accounts runs the danger of ignoring alternate hypotheses and not scrutinizing neuroscience data critically. I also review recent work from my lab that raises questions about the nature of sensory motor grounding in spatial thought and language. In my view, the question of whether or not cognition is grounded is more fruitfully replaced by questions about gradations in this grounding. A focus on disembodying cognition, or on graded grounding, opens the way to think about how humans abstract. Within neuroscience, I propose that three functional anatomic axes help frame questions about the graded nature of grounded cognition. First, are questions of laterality differences. Do association cortices in both hemispheres instantiate the same kind of sensory or motor information? Second, are questions about ventral dorsal axes. Do neuronal ensembles along this axis shift from conceptual representations of objects to the relationships between objects? Third, are questions about gradients centripetally from sensory and motor cortices towards and within perisylvian cortices. How does sensory and perceptual information become more language-like and then get transformed into language proper?

scholarly journals Surface color perception in three-dimensional scenes

2006 ◽  
Vol 23 (3-4) ◽  
pp. 311-321 ◽  
Author(s):  
HUSEYIN BOYACI ◽  
KATJA DOERSCHNER ◽  
JACQUELINE L. SNYDER ◽  
LAURENCE T. MALONEY
Keyword(s):  
Visual System ◽  
Recent Work ◽  
Human Visual System ◽  
Light Field ◽  
Three Dimensional ◽  
Color Perception ◽  
Line Of Sight ◽  
Surface Color ◽  
Matte Surface ◽  
Surface Lightness

Researchers studying surface color perception have typically used stimuli that consist of a small number of matte patches (real or simulated) embedded in a plane perpendicular to the line of sight (a “Mondrian,” Land & McCann, 1971). Reliable estimation of the color of a matte surface is a difficult if not impossible computational problem in such limited scenes (Maloney, 1999). In more realistic, three-dimensional scenes the difficulty of the problem increases, in part, because the effective illumination incident on the surface (the light field) now depends on surface orientation and location. We review recent work in multiple laboratories that examines (1) the degree to which the human visual system discounts the light field in judging matte surface lightness and color and (2) what illuminant cues the visual system uses in estimating the flow of light in a scene.

Gravity in the Brain as a Reference for Space and Time Perception

2015 ◽  
Vol 28 (5-6) ◽  
pp. 397-426 ◽  
Author(s):  
Francesco Lacquaniti ◽  
Gianfranco Bosco ◽  
Silvio Gravano ◽  
Iole Indovina ◽  
Barbara La Scaleia ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Relative Weight ◽  
Visual Images ◽  
Gravitational Acceleration ◽  
Time Stamp ◽  
Space And Time ◽  
Visual Vertical ◽  
Ancient Times ◽  
Behavioral Evidence ◽  
The Brain

Moving and interacting with the environment require a reference for orientation and a scale for calibration in space and time. There is a wide variety of environmental clues and calibrated frames at different locales, but the reference of gravity is ubiquitous on Earth. The pull of gravity on static objects provides a plummet which, together with the horizontal plane, defines a three-dimensional Cartesian frame for visual images. On the other hand, the gravitational acceleration of falling objects can provide a time-stamp on events, because the motion duration of an object accelerated by gravity over a given path is fixed. Indeed, since ancient times, man has been using plumb bobs for spatial surveying, and water clocks or pendulum clocks for time keeping. Here we review behavioral evidence in favor of the hypothesis that the brain is endowed with mechanisms that exploit the presence of gravity to estimate the spatial orientation and the passage of time. Several visual and non-visual (vestibular, haptic, visceral) cues are merged to estimate the orientation of the visual vertical. However, the relative weight of each cue is not fixed, but depends on the specific task. Next, we show that an internal model of the effects of gravity is combined with multisensory signals to time the interception of falling objects, to time the passage through spatial landmarks during virtual navigation, to assess the duration of a gravitational motion, and to judge the naturalness of periodic motion under gravity.

Visual interpretation of known objects in constrained scenes

1992 ◽  
Vol 337 (1281) ◽  
pp. 361-370 ◽  
Keyword(s):  
Object Recognition ◽  
Visual Perception ◽  
Machine Vision ◽  
Recent Work ◽  
Three Dimensional ◽  
Neural Mechanisms ◽  
Visual Interpretation ◽  
Natural Vision ◽  
Analogue Models ◽  
Dynamic Filters

Recent work on the visual interpretation of traffic scenes is described which relies heavily on a priori knowledge of the scene and position of the cam era, and expectations about the shapes of vehicles and their likely movements in the scene. Knowledge is represented in the computer as explicit three-dimensional geometrical models, dynamic filters, and descriptions of behaviour. Model-based vision, based on reasoning with analogue models, avoids many of the classical problems in visual perception: recognition is robust against changes in the image of shape, size, colour and illumination. The three-dimensional understanding of the scene which results also deals naturally with occlusion, and allows the behaviour of vehicles to be interpreted. The experiments with machine vision raise questions about the part played by perceptual context for object recognition in natural vision, and the neural mechanisms which might serve such a role.

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