scholarly journals Using classification images to reveal the critical features in global shape perception

2010 ◽  
Vol 10 (7) ◽  
pp. 1174-1174
Author(s):  
I. Kurki ◽  
A. Hyvarinen ◽  
J. Saarinen
Keyword(s):  
Shape Perception ◽  
Global Shape ◽  
Classification Images

scholarly journals Temporo-parietal brain regions are involved in higher order object perception

2020 ◽  
Author(s):  
Sophia Nestmann ◽  
Daniel Wiesen ◽  
Hans-Otto Karnath ◽  
Johannes Rennig
Keyword(s):  
Object Perception ◽  
Brain Regions ◽  
Shape Perception ◽  
General Mechanism ◽  
Complex Object ◽  
List Type ◽  
Brain Areas ◽  
Visual Stream ◽  
Object Processing ◽  
Global Shape

AbstractLesions to posterior temporo-parietal brain regions are associated with deficits in perception of global, hierarchical shapes, but also impairments in the processing of objects presented under demanding viewing conditions. Evidence from neuroimaging studies and lesion patterns observed in patients with simultanagnosia and agnosia for object orientation suggest similar brain regions to be involved in perception of global shapes and processing of objects in atypical (‘non-canonical’) orientation. In a localizer experiment, we identified individual temporoparietal brain areas involved in global shape perception and found significantly higher BOLD signals during the processing of non-canonical compared to canonical objects. In a multivariate approach, we demonstrated that posterior temporo-parietal brain areas show distinct voxel patterns for non-canonical and canonical objects and that voxel patterns of global shapes are more similar to those of objects in non-canonical compared to canonical viewing conditions. These results suggest that temporo-parietal brain areas are not only involved in global shape perception but might serve a more general mechanism of complex object perception. Our results challenge a strict attribution of object processing to the ventral visual stream by suggesting specific dorsal contributions in more demanding viewing conditions.HighlightsPosterior temporo-parietal brain areas in the TPJ region that are involved in global shape perception are significantly involved in object perceptionIndividual global shape TPJ ROIs identified with a specific localizer experiment prefer objects in non-canonical over objects in canonical orientationsUnivariate activations and multivariate voxel patterns in global shape TPJ ROIs distinguish canonical and non-canonical object presentations

scholarly journals Investigating shape perception by classification images

2014 ◽  
Vol 14 (12) ◽  
pp. 24-24 ◽  
Author(s):  
I. Kurki ◽  
J. Saarinen ◽  
A. Hyvarinen
Keyword(s):  
Shape Perception ◽  
Classification Images

scholarly journals Local motion-contrast Interactions Influence Global Shape Perception

2013 ◽  
Vol 13 (9) ◽  
pp. 377-377
Author(s):  
G. Gurariy ◽  
G. Caplovitz
Keyword(s):  
Shape Perception ◽  
Local Motion ◽  
Global Shape ◽  
Motion Contrast

Modifying Perceived Size of a Handled Object through Hand Image Deformation

2013 ◽  
Vol 22 (3) ◽  
pp. 255-270 ◽  
Author(s):  
Yuki Ban ◽  
Takuji Narumi ◽  
Tomohiro Tanikawa ◽  
Michitaka Hirose
Keyword(s):  
Visual Representation ◽  
Shape Perception ◽  
Size Perception ◽  
Visual Object ◽  
Display System ◽  
Haptic Interaction ◽  
Image Deformation ◽  
Virtual Objects ◽  
The Difference ◽  
Hand Image

In this study, we aim to construct a perception-based shape display system to provide users with the sensation of touching virtual objects of varying shapes using only a simple mechanism. Thus far, we have proved that identified curved surface shapes or edge angles can be modified by displacing the visual representation of the user's hand. However, using this method, we cannot emulate multifinger touch, because of spatial unconformity. To solve this problem, we focus on modifying the identification of shapes using two fingers by deforming the visual representation of the user's hand. We devised a video see-through system that enables us to change the perceived shape of an object that a user is touching visually. The visual representation of the user's hand is deformed as if the user were handling a visual object; however, the user is actually handling an object of a different shape. Using this system, we conducted two experiments to investigate the effects of visuo-haptic interaction and evaluate its effectiveness. One is an investigation on the modification of size perception to confirm that the fingers did not stroke the shape but only touched it statically. The other is an investigation on the modification of shape perception for confirming that the fingers dynamically stroked the surface of the shape. The results of these experiments show that the perceived sizes of objects handled using a thumb and other finger(s) could be modified if the difference between the size of physical and visual stimuli was in the −40% to 35% range. In addition, we found that the algorithm can create an effect of shape perception modification when users stroke the shape with multiple fingers.

Global precedence and response activation: Evidence from LRPs

2002 ◽  
Vol 55 (1) ◽  
pp. 289-310 ◽  
Author(s):  
Jeff Miller ◽  
David Navon
Keyword(s):  
Global Precedence ◽  
Local Shape ◽  
Global Shape ◽  
Preliminary Information ◽  
Readiness Potentials ◽  
Global Advantage ◽  
Response Activation ◽  
Lateralized Readiness Potentials

Lateralized readiness potentials (LRPs) were measured in left/right/no-go tasks using compound global/local stimuli. In Experiment 1, participants responded to local target shapes and ignored global ones. RTs were affected by the congruence of the global shape with the local one, and LRPs indicated that irrelevant global shapes activated the responses with which they were associated. In Experiment 2, participants responded to conjunctions of target shapes at both levels, withholding the response if a target appeared at only one level. Global shapes activated responses in no-go trials, but local shapes did not. The results are consistent with partial-output models in which preliminary information about global shape can partially activate responses that are inconsistent with the local shape. They also demonstrate that part of the global advantage arises early, before response activation begins and probably before recognition of the local shape.

scholarly journals Allocation of attention to biological motion: Local motion dominates global shape

2011 ◽  
Vol 11 (3) ◽  
pp. 4-4 ◽  
Author(s):  
M. Hirai ◽  
D. R. Saunders ◽  
N. F. Troje
Keyword(s):  
Biological Motion ◽  
Local Motion ◽  
Global Shape

scholarly journals Global shape processing: Which parts form the whole?

2010 ◽  
Vol 10 (6) ◽  
pp. 16-16 ◽  
Author(s):  
J. Bell ◽  
S. Hancock ◽  
F. A. A. Kingdom ◽  
J. W. Peirce
Keyword(s):  
Global Shape ◽  
Shape Processing
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