Attention and Spatial Resolution: A Theoretical and Experimental Study of Visual Search in Hierarchical Patterns

Perception ◽  
10.1068/p5633 ◽  
2007 ◽  
Vol 36 (3) ◽  
pp. 335-354 ◽  
Author(s):  
Gustavo Deco ◽  
Dietmar Heinke
2005 ◽  
Vol 81 (7) ◽  
pp. 1009-1014 ◽  
Author(s):  
L.M. Portsel ◽  
V.M. Marchenko ◽  
S. Matern ◽  
H.-G. Purwins

2011 ◽  
Vol 3 (2) ◽  
Author(s):  
Rauf Gardashov

AbstractThe problem is studied both theoretically and experimentally. Statistical distributions of the total curvature and the reciprocal to the total curvature at the specular points (SP) of a random Gaussian uniform sea surface are discussed. The theoretical distribution and its asymptotes are completely investigated. The validity of the theoretical distribution is verified by numerical simulations and natural experiments. In the experimental study of this distribution, Sun glint images taken with a high time and spatial resolution digital camera are used. Those images are developed by using a specially-designed Fortran program which calculates the statistical characteristics of the glints. The experimentally derived distribution of the glint areas is compared with the theoretical distribution. The main causes (origins) of small divergence between the theoretical and experimental results are discussed.


2014 ◽  
Vol 7 (2) ◽  
Author(s):  
Angelika Lingnau ◽  
Thorsten Albrecht ◽  
Jens Schwarzbach ◽  
Dirk Vorberg

We typically fixate targets such that they are projected onto the fovea for best spatial resolution. Macular degeneration patients often develop fixation strategies such that targets are projected to an intact eccentric part of the retina, called pseudofovea. A longstanding debate concerns which pseudofovea-location is optimal for non-foveal vision. We examined how pseudofovea position and eccentricity affect performance in visual search, when vision is restricted to an off-foveal retinal region by a gaze-contingent display that dynamically blurs the stimulus except within a small viewing window (forced field location). Trained normally sighted participants were more accurate when forced field location was congruent with the required scan path direction; this contradicts the view that a single pseudofovea location is generally best. Rather, performance depends on the congruence between pseudofovea location and scan path direction.


2015 ◽  
Vol 11 (2) ◽  
pp. 16-27 ◽  
Author(s):  
M.V. Zotov ◽  
N.E. Andrianova ◽  
A.P. Voyt

The aim of our work was to test the hypothesis that one's identification of objects of attention in an observed individual depends on his/her understanding of the context of a communicative situation based on the comparison of the participants' points of view. In the first experimental study the subjects (N=74) carried out visual search for objects of attention of participants of non-verbal communication scenes with/without information on the communication context provided, and with short/prolonged display of information for assessing gaze direction of the participants. Understanding the context resulted in a higher efficiency of iden¬tification and saccadic detection of the participants' objects of attention in the subjects, regardless of their access to the information on gaze direction. In the second experiment the subjects (N=32), after watching videos of communication episodes, were asked to search for changes of different objects in the scenes. Those subjects who had a clear understanding of the context of communication first of all noticed the changes in the future objects of attention of the participants, in spite of the absence of any 'hints' like head or eye orientation. The outcomes of the research are discussed within the framework of concepts focusing on the significance of polyperspective representations for the understanding of communicative signals.


2004 ◽  
Vol 47 (2) ◽  
pp. 260-263 ◽  
Author(s):  
E. O. Baronova ◽  
R. V. Garanin ◽  
N. V. Zhidkov ◽  
M. M. Stepanenko ◽  
N. A. Suslov

2014 ◽  
Vol 31 (2) ◽  
pp. 174
Author(s):  
Hua Liao ◽  
Xin Hu ◽  
Qinlao Yang ◽  
Guangchao Wang ◽  
Yuncheng Wang ◽  
...  

2020 ◽  
Vol 51 (1) ◽  
pp. 1206-1209
Author(s):  
Midori Tanaka ◽  
Daisuke Nakayama ◽  
Takahiko Horiuchi ◽  
Kenichiro Masaoka

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