scholarly journals Visual crowding is a combination of an increase of positional uncertainty, source confusion, and featural averaging

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
William J. Harrison ◽  
Peter J. Bex
Keyword(s):  
Positional Uncertainty ◽  
Source Confusion ◽  
Visual Crowding ◽  
Uncertainty Source

scholarly journals Visual crowding is a combination of an increase of positional uncertainty, source confusion, and featural averaging

2016 ◽  
Author(s):  
William J Harrison ◽  
Peter J Bex
Keyword(s):  
Peripheral Vision ◽  
Positional Uncertainty ◽  
Show Evidence ◽  
Source Confusion ◽  
Trial Basis ◽  
Visual Crowding ◽  
Line Positions ◽  
Method Of Adjustment ◽  
Uncertainty Source ◽  
Multiple Error

Although we perceive a richly detailed visual world, our ability to identify individual objects is severely limited in clutter, particularly in peripheral vision. Models of such crowding have generally been driven by the phenomenological misidentifications of crowded targets: using stimuli that do not easily combine to form a unique symbol (e.g. letters or objects), observers typically confuse the source of objects and report either the target or a distractor, but when continuous features are used (e.g. orientated gratings or line positions) observers report a feature somewhere between the target and distractor. To reconcile these accounts, we develop a hybrid method of adjustment that allows detailed analysis of these multiple error categories. Observers reported the orientation of a target, under several distractor conditions, by adjusting an identical foveal target. We apply new modelling to quantify whether perceptual reports show evidence of positional uncertainty, source confusion, and featural averaging on a trial-by-trial basis. Our results show that observers make a large proportion of source-confusion errors. However, our study also reveals the distribution of perceptual reports that underlie performance in this crowding task more generally: aggregate errors cannot be neatly labelled because they are heterogeneous and their structure depends on target-distractor distance.

The effects of visual crowding, text size, and positional uncertainty on text legibility at a glance

2018 ◽  
Vol 70 ◽  
pp. 240-246 ◽  
Author(s):  
Jonathan Dobres ◽  
Benjamin Wolfe ◽  
Nadine Chahine ◽  
Bryan Reimer
Keyword(s):  
Positional Uncertainty ◽  
Visual Crowding ◽  
Text Legibility

scholarly journals A summary-statistic representation in peripheral vision explains visual crowding

2009 ◽  
Vol 9 (12) ◽  
pp. 13-13 ◽  
Author(s):  
B. Balas ◽  
L. Nakano ◽  
R. Rosenholtz
Keyword(s):  
Peripheral Vision ◽  
Summary Statistic ◽  
Visual Crowding

Design Considerations for Vibration Assisted Compliant Assembly

1991 ◽  
Author(s):  
Y. Liu ◽  
Ming C. Leu
Keyword(s):  
Relative Motion ◽  
Search Time ◽  
Numerical Procedure ◽  
Vibration Frequencies ◽  
Assembly Model ◽  
Assembly Task ◽  
Design Considerations ◽  
Positional Uncertainty ◽  
Compliant Assembly ◽  
Uncertainty Set

Abstract This paper presents design considerations for vibration assisted compliant assembly involving peg-in-hole insertion. We propose a feasible parts mating assembly model, based on the positional uncertainty and tolerance of an assembly task. For an infeasible task, whose tolerance set does not contain the uncertainty set, it is proposed to introduce a relative motion between the two mating parts, so as to enlarge the task tolerance relative to its uncertainty. A specific type of such motion, viz vibration in two orthogonal directions, is studied in detail. The amplitudes and frequencies of vibrations are determined for given tolerance, uncertainty, and other assembly parameters. A numerical procedure is devised to select the ratio of the two orthogonal vibration frequencies, for minimum search time of parts engagement. Criteria on suitable compliances for assembly are proposed, with consideration of insertion failure.

No Deficiency in Left-to-Right Processing of Words in Dyslexia but Evidence for Enhanced Visual Crowding

2013 ◽  
Vol 66 (9) ◽  
pp. 1803-1817 ◽  
Author(s):  
Maaike Callens ◽  
Carol Whitney ◽  
Wim Tops ◽  
Marc Brysbaert
Keyword(s):  
Visual Crowding

scholarly journals A search for the infrared counterpart of type II OH masers - I. A model for the IR background source confusion

1981 ◽  
Vol 197 (2) ◽  
pp. 413-428 ◽  
Author(s):  
T. J. Jones ◽  
M. Ashley ◽  
A. R. Hyland ◽  
A. Ruelas-Mayorga
Keyword(s):  
Type Ii ◽  
Source Confusion
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