csass nov2 2015 · 2020. 3. 18. · csass_nov2_2015.pptx Author: Nicolas Davidenko Created Date:...
Transcript of csass nov2 2015 · 2020. 3. 18. · csass_nov2_2015.pptx Author: Nicolas Davidenko Created Date:...
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Data example: face drawings
From Day & Davidenko, CogSci 2015
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Experiment details
• Par=cipants (N=8 Psyc 1 students) completed 16 face drawings using a stylus on a touch screen
• 8 different target faces were presented, in both upright and inverted orienta=ons, in blocks of 4: • 4 upright, 4 inverted, 4 upright, and 4 inverted (or reversed)
• Par=cipants had 90 seconds to copy each face
• The accuracy of each drawing was computed by: (a) iden=fying 85 keypoints on the drawing (b) normalizing the drawing to scale with the target face (c) summing distances between the corresponding keypoints
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Two example drawings
Target face Drawing
Upright
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Two example drawings
Target face Drawing
Upright Inverted
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Compu=ng an error measure • Encode each drawing with 85 keypoints (based on face space)
Drawing:
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Compu=ng an error measure • Encode each drawing with 85 keypoints • Normalize and superimpose with target face
Drawing:
Target:
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Error measure • Sum of distances between pairs of corresponding keypoints
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Error measure • Sum of distances between pairs of corresponding keypoints
Error subject 1, face 3, upright = 3.623
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• Based on previous results with profile faces, we predicted errors would be smaller for upright vs. inverted drawings.
• Each subject’s data averaged across 8 upright and 8 inverted faces:
Non-‐ar=sts (real data)
subject number error-‐upright error-‐inverted 1 3.7795 3.559 2 3.0596 3.452 3 3.0415 2.6484 4 2.5876 3.3977 5 3.3241 3.8161 6 3.2086 3.1721 7 3.454 3.9078 8 3.0654 3.8079
mean 3.1900375 3.470125
Hypothesis 1
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• Based on previous results with profile faces, we predicted errors would be smaller for upright vs. inverted drawings.
• Each subject’s data averaged across 8 upright and 8 inverted faces:
Hypothesis 1
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• Based on previous results with profile faces, we predicted errors would be smaller for upright vs. inverted drawings.
• Each subject’s data averaged across 8 upright and 8 inverted faces:
Hypothesis 1
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Hypothesis 2 • (Hypothe=cal) We predict a similar “inversion effect” for ar;sts. • Made up data:
Ar=sts (made up data) subject number error-‐upright error-‐inverted
9 2.556 3.0886 10 1.8738 2.9012 11 2.2997 2.9874 12 2.443 2.9289 13 2.2778 2.3658 14 3.0333 3.1168 15 2.6106 3.1793 16 2.0156 1.7134 17 2.4974 2.5091 18 2.4454 2.9406 19 2.1585 2.0977
mean 2.382827273 2.711709091
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Hypothesis 2 • (Hypothe=cal) We predict a similar “inversion effect” for ar;sts. • Made up data:
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Hypothesis 2 • (Hypothe=cal) We predict a similar “inversion effect” for ar;sts. • Made up data:
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Hypothesis 3 • (Hypothe=cal): Ar=sts will show a greater (or more significant)
inversion effect than non-‐ar=sts