222,301 research outputs found
Reference and the facilitation of search in spatial domains
This is a pre-final version of the article, whose official publication is expected in the winter of 2013-14.Peer reviewedPreprin
Exploiting visual salience for the generation of referring expressions
In this paper we present a novel approach to generating
referring expressions (GRE) that is tailored to a model of the visual context the user is attending to. The approach
integrates a new computational model of visual salience in simulated 3-D environments with Dale and Reiterās (1995) Incremental Algorithm. The advantage of our GRE framework are: (1) the context set used by the GRE algorithm is dynamically computed by the visual saliency algorithm as a user navigates through a simulation; (2) the integration of visual salience into the generation process means that in some instances underspecified but sufficiently detailed descriptions of the target object are generated that are shorter than those generated by GRE algorithms which focus purely on adjectival and type attributes; (3) the integration of visual saliency into the generation process means that our GRE algorithm will in some instances succeed in generating a description of the target object in situations where GRE algorithms which focus purely on adjectival and type attributes fail
Invariance of visual operations at the level of receptive fields
Receptive field profiles registered by cell recordings have shown that
mammalian vision has developed receptive fields tuned to different sizes and
orientations in the image domain as well as to different image velocities in
space-time. This article presents a theoretical model by which families of
idealized receptive field profiles can be derived mathematically from a small
set of basic assumptions that correspond to structural properties of the
environment. The article also presents a theory for how basic invariance
properties to variations in scale, viewing direction and relative motion can be
obtained from the output of such receptive fields, using complementary
selection mechanisms that operate over the output of families of receptive
fields tuned to different parameters. Thereby, the theory shows how basic
invariance properties of a visual system can be obtained already at the level
of receptive fields, and we can explain the different shapes of receptive field
profiles found in biological vision from a requirement that the visual system
should be invariant to the natural types of image transformations that occur in
its environment.Comment: 40 pages, 17 figure
Towards an Indexical Model of Situated Language Comprehension for Cognitive Agents in Physical Worlds
We propose a computational model of situated language comprehension based on
the Indexical Hypothesis that generates meaning representations by translating
amodal linguistic symbols to modal representations of beliefs, knowledge, and
experience external to the linguistic system. This Indexical Model incorporates
multiple information sources, including perceptions, domain knowledge, and
short-term and long-term experiences during comprehension. We show that
exploiting diverse information sources can alleviate ambiguities that arise
from contextual use of underspecific referring expressions and unexpressed
argument alternations of verbs. The model is being used to support linguistic
interactions in Rosie, an agent implemented in Soar that learns from
instruction.Comment: Advances in Cognitive Systems 3 (2014
On the Phenomenon of Unification
One of the aspects of consciousness is the fact that it is formed from unifications of qualia. In this paper, unification will be shown to be a phenomenon that works based on the unformal nature of self-reference. Self-reference being an unformal entity, it is no-thing and every-thing both at the same time. These unformal properties will be shown to play an essential role in the existence and manifestation of unification. The best exemplification of the unformal workings of unification will be shown to happen in the phenomenon of telepathy. Telepathy will be argued to be a case of consciousness unification and will be shown that its imperfection is not a reason for rejecting it, but is a door towards the workings of the phenomenon of unification
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