Tactile Pattern Perception

Most literature on symmetry perception has focused on bilateralreflection symmetry with some suggesting that it isthe only type of symmetry humans can perceive (Wilson &Wilkinson, 2002). Using image stimuli generated from themathematically well-defined seventeen wallpaper groups, thisstudy demonstrates that humans can discriminate various symmetriesfound in 2D wallpaper patterns (Liu, Hel-Or, Kaplan,Van Gool, et al., 2010). Furthermore, the results demonstratethe features which contribute to wallpaper pattern perception.All wallpaper groups but one were found to be reliably distinguishable(p < 0:05). Additionally, as wallpaper patterns canbe arranged in a hierarchy, we propose a metric to quantify thesimilarity of their perception using the shortest path in this hierarchy.This subgroup distance was found to be a factor in alikely model of pattern perception.

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Imagens táteis tridimensionais: um modelo para a tradução tátil a partir de imagens estáticas bidimensionais | Three-dimensional tactile images: a model for tactile translation from two-dimensional static images

InfoDesign - Revista Brasileira de Design da Informação ◽

10.51358/id.v14i2.602 ◽

2017 ◽

Vol 14 (2) ◽

pp. 234-252

Author(s):

Emilia Christie Picelli Sanches ◽

Claudia Mara Scudelari Macedo ◽

Juliana Bueno

Keyword(s):

Visual Information ◽

Three Dimensional ◽

Information Design ◽

Blind People ◽

Two Dimensional ◽

Test Results ◽

Visual Content ◽

Tactile Sense ◽

Digital Modelling ◽

Static Images

A acessibilidade na educação de pessoas cegas é um direito que deve ser cumprido. Levando-se em consideração que o design da informação almeja transmitir uma informação de forma efetiva ao receptor, e que uma imagem estática precisa ser adaptada para que um aluno cego tenha acesso a esse conteúdo visual, propõe-se uma maneira de traduzir a informação visual para o tátil. O propósito deste artigo, então, é apresentar um modelo para tradução de imagens estáticas bidimensionais em imagens táteis tridimensionais. Por isso, parte de uma breve revisão da literatura sobre cegueira, percepção tátil e imagens táteis. Na sequência, apresenta o modelo de tradução em três partes: (1) recomendações da literatura; (2) estrutura e (3) modelo preliminar para teste. Depois, descreve o teste do modelo realizado com dois designers com habilidades de modelagem digital (potenciais usuários). Como resultado dos testes, obtiveram-se duas modelagens distintas, uma utilizando da elevação e outra utilizando texturas, porém, os dois participantes realizaram com sucesso a tarefa pretendida. Ainda, a partir dos resultados dos obtidos, também, foi possível perceber falhas no modelo que necessitam ser ajustadas para as próximas etapas da pesquisa.+++++Accessibility in education of blind people is a right that must be fulfilled. Considering that information design aims to transmit an information in an effective way to the receiver, and that a static image needs to be adapted so that a blind student can have access to this visual content, it is proposed a way to translate the visual information to the tactile sense. The purpose of this paper is to present a translating model of static two-dimensional images into three-dimensional tactile images. First, it starts from a brief literature review aboutblindness, tactile perception and tactile images. Second, it presents the translating model in three sections: (1) literature recommendations; (2) structure and (3) finished model for testing. Then, it describes the tests with the model and two designers with digital modelling abilities (potential users). As a result from the tests, two distinct models were obtained, one using elevation and other using textures, although, both participants successfully made the intended task. Also from the test results, it was possible to perceive flaws on the model that need to be adjusted for the next steps of the research.

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Carving Cameras: Antonioni’s Lo Sguardo di Michelangelo

10.3366/edinburgh/9781474446341.003.0003 ◽

2021 ◽

pp. 23-37

Author(s):

Steven Jacobs

Keyword(s):

Eighteenth Century ◽

Old Testament ◽

Three Dimensional ◽

Tactile Perception ◽

Short Film ◽

Two Dimensional ◽

The Gaze

Dealing with Michelangelo’s famous 1513 statue of Moses, Antonioni’s 2004 short film Lo Sguardo di Michelangelo (literally The Gaze of Michelangelo) is an impressive meditation on the encounter between film and sculpture. By means of the dynamic, immaterial, two-dimensional, and volatile images of the film medium, Lo Sguardo evokes the static, material, three-dimensional, and durable forms of sculpture. Antonioni not only confronts the heroic and muscular statue of the Old Testament prophet with his own old and weakened body, he also juxtaposes visual and tactile perception: the gaze (the director’s eyes and glasses are explicitly framed) is paired with tactility as Antonioni’s hands are touching the marble surfaces. Rearticulating some of the discussions and concepts central to sculptural theory since the eighteenth century, Lo Sguardo di Michelangelo also demonstrates that the medium of film not only represents, reproduces, or duplicates artworks but that it also reconfigures, re-imagines, and remediates them.

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Real-Time Haptic Rendering of Slowly Deformable Bodies Based on Two Dimensional Visual Information for Telemanipulation

Transactions of the Korean Society of Mechanical Engineers A ◽

10.3795/ksme-a.2007.31.8.855 ◽

2007 ◽

Vol 31 (8) ◽

pp. 855-861 ◽

Cited By ~ 4

Author(s):

Jung-Sik Kim ◽

Young-Jin Kim ◽

Jung Kim

Keyword(s):

Real Time ◽

Visual Information ◽

Haptic Rendering ◽

Two Dimensional ◽

Deformable Bodies

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Anatomical segregation of two cortical visual pathways in the macaque monkey

Visual Neuroscience ◽

10.1017/s0952523800005769 ◽

1990 ◽

Vol 4 (6) ◽

pp. 555-578 ◽

Cited By ~ 211

Author(s):

Anne Morel ◽

Jean Bullier

Keyword(s):

Visual Information ◽

Striate Cortex ◽

Small Region ◽

Macaque Monkey ◽

Two Dimensional ◽

Inferotemporal Cortex ◽

Fast Blue ◽

Prestriate Cortex ◽

Inferior Parietal Cortex ◽

Diamidino Yellow

AbstractA number of lines of evidence suggest that, in the macaque monkey, inferior parietal and inferotemporal cortices process different types of visual information. It has been suggested that visual information reaching these two subdivisions follows separate pathways from the striate cortex through the prestriate cortex. We examined directly this possibility by placing injections of the retrograde fluorescent tracers, fast blue and diamidino yellow, in inferior parietal and inferotemporal cortex and examining the spatial pattern of cortical areas containing labeled cells in two-dimensional reconstructions of the cortex.The results of injections in inferotemporal cortex show that TEO receives afferents from areas V2, ventral V3, V3A, central V4, V4t, and DPL in prestriate cortex and from areas IPa, PGa, and FST in the superior temporal sulcus (STS). Area TEp receives afferents only from V4 in prestriate cortex and from IPa, PGa, and FST in the anterior STS. Area TEa receives no prestriate input and is innervated by IPa, PGa, FST, and TPO in the anterior STS.The results of injections in inferior parietal cortex demonstrate that POa receives afferents from dorsal V3, V3A, peripheral V4, DPL, and PO in prestriate cortex, from MST and *VIP and from IPa, PGa, TPO, and FST in anterior STS. Area PGc (corresponding to 7a) is innervated by PO, MST, and by TPO in the anterior STS.Examination of the two-dimensional reconstructions of the pattern of labeling after combined injections of fast blue and diamidino yellow in areas POa and TEO revealed that these areas are principally innervated by different prestriate areas. Only a small region, centered on area V3A and extending into V4 and DPL, contained cells labeled by either injection as well as a small number of double-labeled cells. In contrast, areas POa and TEO receive afferents from extensive common regions in the anterior STS corresponding to areas IPa, PGa, and FST.These results directly demonstrate that visual information from the striate cortex reaches inferior parietal and inferotemporal cortices through largely separate prestriate cortical pathways. On the other hand, both parietal and inferotemporal cortices receive common inputs from extensive regions in the anterior STS which may play a role in linking the processing occurring in these two cortical subdivisions of the visual system.

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The hands have it: Hand specific vision of touch enhances touch perception and somatosensory evoked potential

Seeing and Perceiving ◽

10.1163/187847612x646659 ◽

2012 ◽

Vol 25 (0) ◽

pp. 43 ◽

Cited By ~ 1

Author(s):

Brenda Malcolm ◽

Karen Reilly ◽

Jérémie Mattout ◽

Roméo Salemme ◽

Olivier Bertrand ◽

...

Keyword(s):

Visual Information ◽

Evoked Potential ◽

Sensory Modality ◽

Reaction Times ◽

Spatial Location ◽

Tactile Perception ◽

Somatosensory Evoked Potential ◽

Visual Contact ◽

Temporal Cues ◽

Spatio Temporal

Our ability to accurately discriminate information from one sensory modality is often influenced by information from the other senses. Previous research indicates that tactile perception on the hand may be enhanced if participants look at a hand (compared to a neutral object) and if visual information about the origin of touch conveys temporal and/or spatial congruency. The current experiment further assessed the effects of non-informative vision on tactile perception. Participants made speeded discrimination responses (digit 2 or digit 5 of their right hand) to supra-threshold electro-cutaneous stimulation while viewing a video showing a pointer, in a static position or moving (dynamic), towards the same or different digit of a hand or to the corresponding spatial location on a non-corporeal object (engine). Therefore, besides manipulating whether a visual contact was spatially congruent to the simultaneously felt touch, we also manipulated the nature of the recipient object (hand vs. engine). Behaviourally, the temporal cues provided by the dynamic visual information about an upcoming touch decreased reaction times. Additionally, a greater enhancement in tactile discrimination was present when participants viewed a spatially congruent contact compared to a spatially incongruent contact. Most importantly, this visually driven improvement was greater for the view-hand condition compared to the view-object condition. Spatially-congruent, hand-specific visual events also produced the greatest amplitude in the P50 somatosensory evoked potential (SEP). We conclude that tactile perception is enhanced when vision provides non-predictive spatio-temporal cues and that these effects are specifically enhanced when viewing a hand.

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Lateral geniculate neurons in behaving primates. I. Responses to two-dimensional stimuli

Journal of Neurophysiology ◽

10.1152/jn.1991.66.3.777 ◽

1991 ◽

Vol 66 (3) ◽

pp. 777-793 ◽

Cited By ~ 21

Author(s):

J. W. McClurkin ◽

T. J. Gawne ◽

B. J. Richmond ◽

L. M. Optican ◽

D. L. Robinson

Keyword(s):

Receptive Field ◽

Visual Information ◽

Receptive Fields ◽

Nonlinear Behavior ◽

Temporal Patterns ◽

Two Dimensional ◽

Visual Responses ◽

Linear Summation ◽

Lateral Geniculate ◽

Opposite Contrast

1. Using behaving monkeys, we studied the visual responses of single neurons in the parvocellular layers of the lateral geniculate nucleus (LGN) to a set of two-dimensional black and white patterns. We found that monkeys could be trained to make sufficiently reliable and stable fixations to enable us to plot and characterize the receptive fields of individual neurons. A qualitative examination of rasters and a statistical analysis of the data revealed that the responses of neurons were related to the stimuli. 2. The data from 5 of the 13 "X-like" neurons in our sample indicated the presence of antagonistic center and surround mechanisms and linear summation of luminance within center and surround mechanisms. We attribute the lack of evidence for surround antagonism in the eight neurons that failed to exhibit center-surround antagonism either to a mismatch between the size of the pixels in the stimuli and the size of the receptive field or to the lack of a surround mechanism (i.e., the type II neurons of Wiesel and Hubel). 3. The data from five other neurons confirm and extend previous reports indicating that the surround regions of X-like neurons can have nonlinearities. The responses of these neurons were not modulated when a contrast-reversing, bipartite stimulus was centered on the receptive field, which suggests a linear summation within the center and surround mechanisms. However, it was frequently the case for these neurons that stimuli of identical pattern but opposite contrast elicited responses of similar polarity, which indicates nonlinear behavior. 4. We found a wide variety of temporal patterns in the responses of individual LGN neurons, which included differences in the magnitude, width, and number of peaks of the initial on-transient and in the magnitude of the later sustained component. These different temporal patterns were repeatable and clearly different for different visual patterns. These results suggest that visual information may be carried in the shape as well as in the amplitude of the response waveform.

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