scholarly journals Perceptual Grouping and Segmentation: Uncrowding

2017 ◽  
Vol 17 (10) ◽  
pp. 366
Author(s):  
Gregory Francis ◽  
Alban Bornet ◽  
Adrien Doerig ◽  
Michael Herzog
Keyword(s):  
Perceptual Grouping ◽  
Grouping And Segmentation

scholarly journals Cortical Dynamics of Perceptual Grouping and Segmentation: Crowding

2016 ◽  
Vol 16 (12) ◽  
pp. 1114 ◽  
Author(s):  
Gregory Francis ◽  
Mauro Manassi ◽  
Michael Herzog
Keyword(s):  
Perceptual Grouping ◽  
Cortical Dynamics ◽  
Grouping And Segmentation

scholarly journals Flexible contextual modulation of naturalistic texture perception in peripheral vision

2020 ◽  
Author(s):  
Daniel Herrera-Esposito ◽  
Ruben Coen-Cagli ◽  
Leonel Gomez-Sena
Keyword(s):  
Visual Field ◽  
Perceptual Grouping ◽  
Peripheral Vision ◽  
Neural Mechanisms ◽  
Summary Statistics ◽  
Visual Behavior ◽  
Foveal Vision ◽  
Contextual Modulation ◽  
Grouping And Segmentation ◽  
Influential Theory

AbstractPeripheral vision comprises most of our visual field, and is essential in guiding visual behavior. Its characteristic capabilities and limitations, which distinguish it from foveal vision, have been explained by the most influential theory of peripheral vision as the product of representing the visual input using summary-statistics. Despite its success, this account may provide a limited understanding of peripheral vision, because it neglects processes of perceptual grouping and segmentation. To test this hypothesis, we studied how contextual modulation, namely the modulation of the perception of a stimulus by its surrounds, interacts with segmentation in human peripheral vision. We used naturalistic textures, which are directly related to summary-statistics representations. We show that segmentation cues affect contextual modulation, and that this is not captured by our implementation of the summary-statistics model. We then characterize the effects of different texture statistics on contextual modulation, providing guidance for extending the model, as well as for probing neural mechanisms of peripheral vision.

Perceptual grouping of line features in 3-D space: a model-based framework

2004 ◽  
Vol 37 (1) ◽  
pp. 145-159 ◽  
Author(s):  
In Kyu Park ◽  
Kyoung Mu Lee ◽  
Sang Uk Lee
Keyword(s):  
Perceptual Grouping ◽  
Model Based ◽  
Line Features

The Subjective Present and Its Modulation in Clinical Contexts

2013 ◽  
Vol 1 (2) ◽  
pp. 239-259 ◽  
Author(s):  
Wolfgang Tschacher ◽  
Fabian Ramseyer ◽  
Claudia Bergomi
Keyword(s):  
Perceptual Grouping ◽  
Statistical Significance ◽  
Temporal Distribution ◽  
Future Research ◽  
Implicit Processes ◽  
The Social ◽  
Gestalt Perception ◽  
Psychotherapeutic Techniques ◽  
The Mean ◽  
The Individual

Time is a basic dimension in psychology, underlying behavior and experience. Timing and time perception constitute implicit processes that are often inaccessible to the individual person. Research in this field has shown that timing is involved in many areas of clinical significance. In the projects presented here, we combine timing with seemingly different fields of research, such as psychopathology, perceptual grouping, and embodied cognition. Focusing on the time scale of the subjective present, we report findings from three different clinical studies: (1) We studied perceived causality in schizophrenia patients, finding that perceptual grouping (‘binding’, ‘Gestalt formation’), which leads to visual causality perceptions, did not distinguish between patients and healthy controls. Patients however did integrate context (provided by the temporal distribution of auditory context stimuli) less into perceptions, in significant contrast to controls. This is consistent with reports of higher inaccuracy in schizophrenia patients’ temporal processing. (2) In a project on auditory Gestalt perception we investigated auditory perceptual grouping in schizophrenia patients. The mean dwell time was positively related to how much patients were prone to auditory hallucinations. Dwell times of auditory Gestalts may be regarded as operationalizations of the subjective present; findings thus suggested that patients with hallucinations had a shorter present. (3) The movement correlations of interacting individuals were used to study the non-verbal synchrony between therapist and patient in psychotherapy sessions. We operationalized the duration of an embodied ‘social present’ by the statistical significance of such associations, finding a window of roughly 5.7 seconds in conversing dyads. We discuss that temporal scales of nowness may be modifiable, e.g., by mindfulness. This yields promising goals for future research on timing in the clinical context: psychotherapeutic techniques may alter binding processes, hence the subjective present of individuals, and may affect the social present in therapeutic interactions.

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