Human Vision. Human Vision - Perception
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1 1 Human Vision
2 SPATIAL ORIENTATION IN FLIGHT 2 Limitations of the Senses Visual Sense Nonvisual Senses
3 SPATIAL ORIENTATION IN FLIGHT 3 Limitations of the Senses Visual Sense Nonvisual Senses Sluggish source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see
4 SPATIAL ORIENTATION IN FLIGHT Limitations of the Senses 4 Visual Sense Nonvisual Senses Sluggish Spatially Imprecise source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see
5 VISUAL ORIENTATION 3-D Neurobehavioral Model 5 Focal Extrapersonal (object recognition) Ambient Extrapersonal Action Extrapersonal (navigation) Peripersonal (reaching) Peripersonal Ambient Extrapersonal (Spatial orientation) Action Extrapersonal Focal Extrapersonal Image by MIT OpenCourseWare. Image by MIT OpenCourseWare.
6 VISUAL ORIENTATION The Two Visual System Hypothesis 6 Image by MIT OpenCourseWare.
7 VISUAL ORIENTATION The Two Visual System Hypothesis 7 Image by MIT OpenCourseWare. Focal Mode Object recognition ( What? ) Processes fine visual details Confined to central visual field Conscious processing (attention demanding) Synthetic spatial orientation
8 VISUAL ORIENTATION The Two Visual System Hypothesis 8 Image by MIT OpenCourseWare. Focal Mode Object recognition ( What? ) Processes fine visual details Confined to central visual field Conscious processing (attention demanding) Synthetic spatial orientation
9 VISUAL ORIENTATION 9 Alterations of The Ambient Visual Frame Distortion -- The Ames Room Absence -- The Black Hole Approach This image is in the public domain. Source: Wikipedia. Distortion -- Memory Image by MIT OpenCourseWare. Original Remembered source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see
10 VISUAL ORIENTATION 10 Ambient Visual Effects (Self-Motion) Characteristics of Vection Requires large retinal area (including periphery) More dependent on background visual field Relies on moving textures (sluggish response, low frequency) Can occur with optically degraded stimuli Image by MIT OpenCourseWare. Image by MIT OpenCourseWare.
11 VISUAL ORIENTATION Ambient Visual Effects (Self-Position) 11 Characteristics of Field-Dependence Similar visual requirements as vection (e.g., reliance on background field, can tolerate optical degradation) Tilted scenes produces changes in perceived visual vertical, gravitational vertical and posture Other position effects (luminance gradients, depth) Rod-and-frame
12 VISUAL ORIENTATION Ambient Visual Effects (Self-Position) 12 Characteristics of Field-Dependence Similar visual requirements as vection (e.g., reliance on background field, can tolerate optical degradation) Tilted scenes produces changes in perceived visual vertical, gravitational vertical and posture Other position effects (luminance gradients, depth) Rod-and-frame
13 VISUAL ORIENTATION 13 Ambient Visual Effects (Self-Position) Characteristics of Field-Dependence Similar visual requirements as vection (e.g., reliance on background field, can tolerate optical degradation) Tilted scenes produces changes in perceived visual vertical, gravitational vertical and posture Other position effects (luminance gradients, depth) Rod-and-frame Postural Effects source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see
14 VISUAL ORIENTATION 14 Ambient Visual Effects (Self-Position) Characteristics of Field-Dependence Similar visual requirements as vection (e.g., reliance on background field, can tolerate optical degradation) Tilted scenes produces changes in perceived visual vertical, gravitational vertical and posture Other position effects (luminance gradients, depth) Rod-and-frame source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see Postural Effects Optokinetic-Cervical Reflex
15 VISUAL ORIENTATION 15 Ambient Luminance Gradients Luminance Gradients Light-to-Dark Gradient Important in Judging Visual Vertical Gradient Inversions Caused by Low Sun Angles Clouds Terrain Shadowing Lunar Reflections Can Result in Inversion Illusions source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see
16 VISUAL ORIENTATION 16 Ambient Luminance Gradients Luminance Gradients Light-to-Dark Gradient Important in Judging Visual Vertical Gradient Inversions Caused by Low Sun Angles Clouds Terrain Shadowing Lunar Reflections, etc. Can Result in Inversion Illusions source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see
17 VISUAL ORIENTATION 17 Ambient Luminance Gradients Luminance Gradients Light-to-Dark Gradient Important in Judging Visual Vertical Gradient Inversions Caused by Low Sun Angles Clouds Terrain Shadowing Lunar Reflections, etc. Can Result in Inversion Illusions Inverted source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see
18 VISUAL ORIENTATION 18 Ambient Luminance Gradients Luminance Gradients Light-to-Dark Gradient Important in Judging Visual Vertical Gradient Inversions Caused by Low Sun Angles Clouds Terrain Shadowing Lunar Reflections, etc. Can Result in Inversion Illusions Upright source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see
19 VISUAL ORIENTATION Ambient Visual Cues to Depth 19 Ambient Depth Cues Linear perspective/foreshortening Gradient of texture Motion parallax Illumination Aerial perspective Image courtesy of Patrick M. on Flickr. Linear perspective Image courtesy of Cameron Chamberlain on Flickr. Aerial perspective Image by MIT OpenCourseWare. Motion parallax
20 VISUAL ORIENTATION Ambient Visual Cues to Depth 20 Linear Perspective & Gradient of Texture Linear perspective Aerial perspective Image courtesy of Patrick M. on Flickr. Motion parallax
21 VISUAL ORIENTATION Ambient Visual Cues to Depth 21 Ambient Depth Cues Linear perspective/foreshortening Gradient of texture Motion parallax Illumination Aerial perspective Image courtesy of Patrick M. on Flickr. Linear perspective Image courtesy of Cameron Chamberlain on Flickr. Aerial perspective Image by MIT OpenCourseWare. Motion parallax
22 VISUAL ORIENTATION 22 Ambient Visual Cues to Depth Motion Parallax Image by MIT OpenCourseWare.
23 VISUAL ORIENTATION Ambient Visual Cues to Depth 23 Ambient Depth Cues Linear perspective/foreshortening Gradient of texture Motion parallax Illumination Aerial perspective Image courtesy of Patrick M. on Flickr. Linear perspective Image courtesy of Cameron Chamberlain on Flickr. Aerial perspective Image by MIT OpenCourseWare. Motion parallax
24 VISUAL ORIENTATION Ambient Visual Cues to Depth 24 Aerial Perspective Image courtesy of Cameron Chamberlain on Flickr.
25 VISUAL ORIENTATION Focal Visual Effects 25 Size and Shape Constancies Rigidity is considered to be a fundamental property of objects; therefore, deviations in the size and shape of ground objects are perceived as changes in our orientation relative to the ground Image by MIT OpenCourseWare. (a) (a) (b) (b) (c) (c) Image by MIT OpenCourseWare. Size Constancy Image by MIT OpenCourseWare. Shape Constancy
26 VISUAL ORIENTATION Focal Visual Effects 26 Size and Shape Constancies Rigidity is considered to be a fundamental property of objects; therefore, deviations in the size and shape of ground objects are perceived as changes in our orientation relative to the ground Image by MIT OpenCourseWare. (a) (a) (b) (b) (c) (c) Image by MIT OpenCourseWare. Size Constancy Image by MIT OpenCourseWare. Shape Constancy
27 VISUAL ORIENTATION Focal Visual Effects 27 Size and Shape Constancies Rigidity is considered to be a fundamental property of objects; therefore, deviations in the size and shape of ground objects are perceived as changes in our orientation relative to the ground Image by MIT OpenCourseWare. (a) (a) (b) (b) (c) (c) Image by MIT OpenCourseWare. Size Constancy Image by MIT OpenCourseWare. Shape Constancy
28 Contents 28 Introduction Contrast & Frequency Visual Pathway, Visual Image Receptive Fields, Gestalt Color, Color deficits, after images Size of objects
29 Spatial Frequency and Contrast 29 Contrast amplitude Spatial frequency of grid This image is in the public domain. For more examples:
30 Optic nerve - from eye to brain 30 Left visual field -> right brain side Right visual field -> left brain side Left visual field Right visual field Number of cells Rods: 125 * 10 6 Cones: Ganglion: Optic nerv: Optic nerv: 6 * * * * 10 6 Primary visual cortex: 250 * 10 6 Retina 11cm 2 Optic nerve diameter 2mm Temporal Nasal Temporal Optic chiasm convergence receptors ->ganglion Pulvinar nucleus Lateral geniculate nucleus Superior colliculus divergence optic nerv -> visual cortex Optic radiation Primary visual cortex Image by MIT OpenCourseWare.
31 Rod and cone density 31 Blind spot Fovea Image of rods and cones removed due to copyright restrictions. Number/mm 2 Rods Rods Cones 50 o 70 o 30 o 10 o 0 Distance across retina 10 o 30 o 50 o 70 o 90 o Image by MIT OpenCourseWare. On average 120 rods converge on 1 ganglion cell On average 6 cones converge on 1 ganglion cell
32 Image properties 32 source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see Image quality created by retina is not homogenous Color vision mainly in fovea Resolution decreases in periphery Best resolution for color in the fovea Best resolution for b/w 20 parafovela
33 Questions 33 How come that we perceive such a nice and homogenous image of our surrounding? What happened to the blind-spot hole? Why do we perceive color in the periphery?
34 Receptive Fields On Off Light-dot On Off Light-dot On Off Light-dot On Off Light-dot On-center Fields Image by MIT OpenCourseWare. _ + + _ + Image by MIT OpenCourseWare.
35 Filling the blind spot 35 X X X Close your left eye and fixated with the right eye the X. Which number is missing? What is the color pattern at the psotion of the missing number? The blind spot is filled with the surrounding pattern.
36 Figure and background 36 The total visual input is organized into figures and background. The Gestalt-laws describe principles how figure and ground are separated. Figures are in front, have a border, connected, things. The background is behind the figure, withour border, uninterrupted, homogenous.
37 Gestalt-laws 37 Image by MIT OpenCourseWare.
38 Perceptual categories 38 Image by MIT OpenCourseWare. Square Diamond The shapes in-between are neither square nor diamond. Our perception is organized in categories, even if the stimuli are continuos.
39 Perceptual categories: Reproducing shapes 39 Figure in B is the drawing when the shape of the Figure A is given as a tactile stimulus (without vision). A B Image by MIT OpenCourseWare.
40 Emergence 40 source unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see The dog is perceived as a whole, all at once. We do not construct the dog by first identifying its parts, e.g. combining feet, ears, nose, tail, etc.
41 Invariance 41 simple geometrical objects are recognized independent of rotation, translation, and scale, (and other deformations) Objects in A are immediately recognized as the same shape, are different from those in B, are the same as in C despite perspective and elastic deformations, and can be depicted using different graphic elements as in D. This image is in the public domain. Source: Wikipedia.
42 Reification 42 The perceived object can contain more information as given by the sensory input. (e.g. ball in C) Mostly for spatial information. This image is in the public domain. Source: Wikipedia.
43 Multistable perception 43 This image is in the public domain. Source: Wikipedia. Necker cube Rubin's Figure / Vase Ambiguous perceptual experiences (2 figures share a common border) lead to multistable perception. The experiences pop back and forth between two or more alternative interpretations.
44 What are the components? 44 Image by MIT OpenCourseWare.
45 Some of the combinations 45 Tasten Aufbau Image by MIT OpenCourseWare.
46 Color 46 Image removed due to copyright restrictions. Original image can be viewed on Wikimedia. Wavelength - physics Color - perception Image removed due to copyright restrictions. Original image can be viewed on Wikimedia.
47 Color blindness 47 Normal color vision is trichormat, 3 cone types are used. Dichromacy, most common Red-Green color blindness lacking or reduced long-wavelength or medium-wavelength cones (4-8% of the male population!) includes: Protanopia (rare), Deuteranopia (1% m), Protanomaly (1% m), Deuteranomaly (6% m) Monochromacy, complete inability to distinguish any colors cone monochromacy (only 1 cone type) rod monochromacy (only rods) Human Factors Color codes (Maps, Signals, etc) Image removed due to copyright restrictions. Original image can be viewed on Wikimedia.
48 Color blindness - samples Trichormat (all cones) 48 Protanopia (L-cone) Deutanopia (M-cone) Tritanopia (S-cone) sources unknown. All rights reserved. This content is excluded from our Creative Commons license. For more information, see
49 Color vision - after images 1 49 Fixate center dot on flag for 1 minute, then look at a white surface
50 Color vision - after images 2 50
51 51 0,5 Grad MOON 3476 Kilometer Kilometer 0,5 Grad SUN 1,392 Million Kilometer 149,6 Million Kilometer Image by MIT OpenCourseWare.
52 Perceived size How to estimate the distance of person? 52 Image Angel D P = D/S W = P *K P P W f Sinnesorgan f -1 Eye Image by MIT OpenCourseWare. S K
53 Additional Slides 53 Image by MIT OpenCourseWare.
54 Major parts 54 Occipital lobe: visual perception system E.g., visuospatial processing, discrimination of movement and colour discrimination Adapted from Stangor, C. Introduction to Psychology. Flatworld Knowledge, Courtesy of Flatworld Knowledge.
55 Sensory Maps - Homunculus 55 Image of Homunculus removed due to copyright restrictions.
56 56 Image removed due to copyright restrictions. Original image can be viewed on Scientific American.
57 Figure 6.3 removed due to copyright restrictions. Source: Proctor, Robert W., and Trisha Van Zandt. Human Factors in Simple and Complex Systems. CRC Press, Preview image with Google Books.
58 Figure 6.8 removed due to copyright restrictions. Source: Proctor, Robert W., and Trisha Van Zandt. Human Factors in Simple and Complex Systems. CRC Press, Preview image with Google Books.
59 Figure 6.9 removed due to copyright restrictions. Source: Proctor, Robert W., and Trisha Van Zandt. Human Factors in Simple and Complex Systems. CRC Press, Preview image with Google Books.
60 Figure 6.12 removed due to copyright restrictions. Source: Proctor, Robert W., and Trisha Van Zandt. Human Factors in Simple and Complex Systems. CRC Press, 2008.
61 Figure 6.15 removed due to copyright restrictions. Source: Proctor, Robert W., and Trisha Van Zandt. Human Factors in Simple and Complex Systems. CRC Press, 2008.
62 Figure 6.16 removed due to copyright restrictions. Source: Proctor, Robert W., and Trisha Van Zandt. Human Factors in Simple and Complex Systems. CRC Press, 2008.
63 Figure 6.17 removed due to copyright restrictions. Source: Proctor, Robert W., and Trisha Van Zandt. Human Factors in Simple and Complex Systems. CRC Press, 2008.
64 Figure 6.17 removed due to copyright restrictions. Source: Proctor, Robert W., and Trisha Van Zandt. Human Factors in Simple and Complex Systems. CRC Press, 2008.
65 Figure 6.22 removed due to copyright restrictions. Source: Proctor, Robert W., and Trisha Van Zandt. Human Factors in Simple and Complex Systems. CRC Press, Preview image with Google Books.
66 Figure 6.23 removed due to copyright restrictions. Source: Proctor, Robert W., and Trisha Van Zandt. Human Factors in Simple and Complex Systems. CRC Press, Preview image with Google Books.
67 MIT OpenCourseWare / Human Factors Engineering Fall 2011 For information about citing these materials or our Terms of Use, visit:
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