scholarly journals Spatial determinants of depth perception in two-dot motion patterns

1972 ◽  
Vol 11 (4) ◽  
pp. 263-268 ◽  
Author(s):  
Erik BÖrjesson ◽  
Claes Von Hofsten
Keyword(s):  
Depth Perception ◽  
Motion Patterns ◽  
Dot Motion

scholarly journals Information foraging for perceptual decisions

2016 ◽  
Author(s):  
Casimir Johannes Hendrikus Ludwig ◽  
David R. Evens
Keyword(s):  
Cognitive Processing ◽  
Information Source ◽  
Sampling Strategy ◽  
Sources Of Information ◽  
Perceptual Decision Making ◽  
Multiple Sources ◽  
Information Foraging ◽  
Motion Patterns ◽  
Dot Motion ◽  
Absolute Judgement

We tested an information foraging framework to characterise the mechanisms that drive active (visual) sampling behaviour in decision problems that involve multiple sources of information. Experiments 1-3 involved participants making an absolute judgement about the direction of motion of a single random dot motion pattern. In Experiment 4, participants made a relative comparison between two motion patterns that could only be sampled sequentially. Our results show that: (i) Information (about noisy motion information) grows to an asymptotic level that depends on the quality of the information source; (ii) The limited growth is due to unequal weighting of the incoming sensory evidence, with early samples being weighted more heavily; (iii) Little information is lost once a new source of information is being sampled; (iv) The point at which the observer switches from one source to another is governed by on-line monitoring of his or her degree of (un)certainty about the sampled source. These findings demonstrate that the sampling strategy in perceptual decision-making is under some direct control by ongoing cognitive processing. More specifically, participants are able to track a measure of (un)certainty and use this information to guide their sampling behaviour.

Three-dimensional image analysis and visualization in confocal light microscopy

1993 ◽  
Vol 51 ◽  
pp. 158-159
Author(s):  
J. K. Samarabandu ◽  
R. Acharya ◽  
D. R. Pareddy ◽  
P. C. Cheng
Keyword(s):  
Depth Perception ◽  
Computer Graphic ◽  
Three Dimensional ◽  
Cellular Organization ◽  
Data Set ◽  
Computational Burden ◽  
Interactive Operation ◽  
Cell Organization ◽  
Confocal Images ◽  
3D Digitization

In the study of cell organization in a maize meristem, direct viewing of confocal optical sections in 3D (by means of 3D projection of the volumetric data set, Figure 1) becomes very difficult and confusing because of the large number of nucleus involved. Numerical description of the cellular organization (e.g. position, size and orientation of each structure) and computer graphic presentation are some of the solutions to effectively study the structure of such a complex system. An attempt at data-reduction by means of manually contouring cell nucleus in 3D was reported (Summers et al., 1990). Apart from being labour intensive, this 3D digitization technique suffers from the inaccuracies of manual 3D tracing related to the depth perception of the operator. However, it does demonstrate that reducing stack of confocal images to a 3D graphic representation helps to visualize and analyze complex tissues (Figure 2). This procedure also significantly reduce computational burden in an interactive operation.

Lightness and depth perception: An update

2001 ◽  
Author(s):  
Alan L. Gilchrist ◽  
Dejan Todorovic
Keyword(s):  
Depth Perception
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