Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"ventral stream"”.
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Benchmarking models of the ventral stream
… a benchmark by which to measure models of the ventral stream using crowd-sourced human behavioral measurements. We collected human error patterns on an object recognition task across a variety of images. By comparing the error pattern of these models to the error pattern of humans, we can …
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Category and Space in the Ventral Stream
… or whether it is distributed throughout the ventral stream. To this means we conducted an fMRI adaptation experiment and tested whether face- and house-selective ventral stream areas exhibit adaptation across object categories. We found that both areas adapted to both preferred and …
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The invariance hypothesis and the ventral stream
… hypothesis is the claim that properties of the ventral stream can be deduced from 1. a consideration of the computational problem with which it is engaged: invariant object recognition, 2. constraints of the neural "hardare", and 3. the visual environment. We are interested here in a particular …
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Specialized Signals for Spatial Attention in the Ventral and Dorsal Visual Streams
… conceived the visual system as having a ventral stream of vision for perception and a dorsal one associated with vision for action. However functional differences between them have become relatively blurred in recent years, not the least by the systematic parallel mapping of functions …
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Towards an integrated model of feedforward-feedback processing in the visual cortex
… model of the feedforward part of the ventral stream in the visual cortex and successfully models human performance on visual recognition tasks for the first 50-100 milliseconds since the presentation of the visual stimulus. We make the first steps to a possible augmentation of the …
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High-level visual object representation in juvenile and adult primates
… These computations are thought to reside in the ventral visual stream, specifically culminating in inferior temporal (IT) cortex. Recent research in machine learning has made great progress in modeling primate ventral visual stream computations. While the end result of current machine learning …
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New evidence of functional interactions within the hand motor system
… integrated hand motor system including also the ventral stream, always considered as specialized in perceiving visual inputs (Chapter 3). Finally, we focused on the often neglected homologous regions within the right hemisphere (Chapter 4), providing a pan of the hand motor system in its …
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Learning a dictionary of shape-components in visual cortex : comparison with neurons, humans and machines
… and computations of the feedforward path of the ventral stream of visual cortex. This model is consistent with a general theory of visual processing that extends the hierarchical model of [Hubel and Wiesel, 1959] from primary to extrastriate visual areas. It attempts to explain the first few …
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What and where : a Bayesian inference theory of visual attention
… in an existing feedforward model of the ventral stream, improves its object recognition performance in clutter.
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An invariance-based account of feedforward categorization in a realistic model of the ventral visual pathway
… related models such as HMAX, mimics that of the ventral stream of visual cortex. In essence, they apply the model of Hubel and Wiesel recursively, alternating layers of 'simple' cells, which are tuned to certain local features, and 'complex' cells, which pool the outputs of simple cells within a …
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Roles of the Dorsal and Ventral Visual Streams In Fluent Reading
… et al., 1996), specifically in the dorsal visual stream of the brain, which processes motion. It is unclear, however, whether or not there is a significant relationship between visual processing in the dorsal stream and reading ability in typically developing children. Furthermore, few studies …
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Topographic deep artificial neural network as a model of primate ventral visual stream
… responses at corresponding levels of the primate ventral visual stream (V1, V2, V4, and IT), those models do not explain the spatial organization of those neurons in general or the organization of the IT face processing network in particular. In this work, we test whether a new class of ANNs can …
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Advancing System Models of Brain Processing via Integrative Benchmarking
… and behavioral experiments in the primate visual ventral stream and the human language system, as well as direct neural (causal) perturbation experiments in inferotemporal cortex. By systematically evaluating a wide variety of model candidates, we not only identify models beginning to match a …
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Rapid Visual Object Learning in Humans is Explainable by Low-Dimensional Image Representations
… on recent advances in image-computable models of ventral stream representations. We point to shortcomings of these models, including the fact none of these models actually match the ability to human few-shot learn. In Part II, we analyze this few-shot learning failure from a theoretical …
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Dorsal stream : from algorithm to neuroscience
The dorsal stream in the primate visual cortex is involved in the perception of motion and the recognition of actions. The two topics, motion processing in the brain, and action recognition in videos, have been developed independently in the field of neuroscience and computer vision. We present a …
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From Rest to Action: Functional Connectivity Architecture of the Human Hand Motor Network
… changes across fronto-parietal pathways, the ventral stream, and the cerebellum. These findings provide novel evidence that hAIP is embedded in a distributed network supporting hand motor control, mirroring — but not fully replicating — the connectivity architecture described in non-human …
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Unsupervised learning of invariant object representation in primate visual cortex
… of the object, illumination, and clutter. The ventral visual stream in non-human primate has solved this problem. At the highest stage of the visual hierarchy, the inferior temporal cortex (IT), neurons have selectivity for objects and maintain that selectivity across variations in the images. …
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The Representation Of Numerosity In The Human Brain And Machines
… areas along the dorsal but also notably the ventral stream, and that the neural representational geometries of regions across the two steams are substantially identical. Second, I showed that numerosity is represented at an early stage and seemingly in parallel across of a set of regions …
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Action and rehabilitation in hemispatial neglect
… structure that receives input from the ventral visual stream, but not from the dorsal-stream. Consequently, they postulate that neglect patients should code spatial parameters for action veridically. Another strong claim of the model is that the dorsal stream’s control of action is …
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Mechanisms of hippocampal relational memory binding
… to simulate the processing of visual sensory streams and the hippocampus. It was composed of two cortical components, both of which were composed of hierarchically arranged adaptive resonance theory (ART) networks that used an unsupervised learning algorithm to capture the statistical …