Nonconscious Adaptation to Spatial & Temporal … Adaptation to Spatial & Temporal Structure of...
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Nonconscious Adaptation to Spatial & Temporal Structure of Biological Motion Nathan Faivre 1,* & Christof Koch 1,2 1. California Institute of Technology 2. Allen Institute for Brain Science Structure & Kinematic Structure Kinematic Non-dominant eye Dominant eye Fixation 3-7s adaptor 0.2s blank 0.7s Target Subjective Visibilty 5 Objective Visibility First walker? Gender? PLW ~ Point-Light Walker A set of dots moving together can elicit a vivid percept of a male or a female walking. Gender can be defined by structural (e.g., shoulder- hip ratio), and/or kinematic cues (e.g., lateral body sway) 1 . We measured how adaptor PLW could bias gender perception of ambiguous target PLW 2 , both in the presence and absence of perceptual awareness. We estimated both spatial and temporal integration, by respectively measuring such biases from structural and/or kinematic gender information. Incremental drawings of PLW 1 + e β(log(f) - log(ε)) 1 p(f) = Fit: logistic function: 1 2 3 0.00 0.25 0.50 0.75 1.00 p < .005 p < .01 1. Objective-Subjective Visibility 2. Repetition effects 4. Positive Shifts of Perceptual Subjective Equality 1. No experience | 2. Brief glimpse | 3. Almost clear image | 4. Perfectly clear image 1.00 0.75 0.50 0.25 0.00 1.00 0.75 0.50 0.25 0.00 Proportion of female response -3 -2 -1 0 1 -3 -2 -1 0 1 -3 -2 -1 0 1 -3 -2 -1 0 1 1.5 1.0 0.5 0.0 -0.5 -1.0 Perceptual Shift of Equality (SD) 0.4 0.6 0.8 1.0 Invisible - structure & kinematic Invisible - kinematic Invisible - structure Invisible - slow kinematic R 2 = 0.616, p < 0.001 R 2 = 0.663, p < 0.001 0.4 0.6 0.8 1.0 1 2 3 4 1 2 3 4 structure & kinematic 0.4 0.5 0.6 0.7 0.8 0.9 1.0 structure slow kinematic kinematic structure & kinematic structure slow kinematic kinematic Visible Invisible R 2 = 0.226, p = 0.057 R 2 = 0.173, p = 0.038 Objective Accuracy Subjective Visibility Reports Visible structure & kinematic Visible structure Visible kinematic Visible slow kinematic Invisible structure & kinematic Invisible structure Invisible kinematic Invisible slow kinematic Target gender (σ) p < .005 n=9 p = .61 n=8 p < .02 n=7 p < .05 n=10 p < .001 n=7 p = .69 n=8 p < .02 n=7 p = .33 n=10 * * p < .001 p < .001 p < .001 p < .001 p = .42 p = .46 p = .34 p = .48 Visible structure & kinematic Visible structure Visible kinematic Visible slow kinematic Invisible structure & kinematic Invisible structure Invisible kinematic Invisible slow kinematic Objective Accuracy Visible Invisible −3 −2 −1 0 1 0.00 0.25 0.50 0.75 1.00 Proportion of female response Visible - 7s structure & kinematic Proportion of female response PSE f PSE m Target gender (σ) Female Male Female Male Female Male 3. Replication Troje et al. PSE: Perceptual Subjective Equality 1 2 3 0.00 0.25 0.50 0.75 1.00 Number of prime repetitions * [email protected] Introduction Results References Aknowledgments Fyssen Foundation | Mathers Foundation Niko Troje, Queen's university Paradigm CFS 3 : 0.08 ̊-1.16 ̊ circles; 10Hz Stimulus size: Dot diameter: .23 ̊; PLW: 2.6 ̊ x 7.1 ̊ Michelson contrast: Adaptor = .08; Target = .36 Female | Male definition: Adaptor: -7σ | +5σ; Target: -3σ | -2σ | -1σ | 0 | +1σ from the mean PLW 4 1. Johansson, 1973. Percept & Psychophys. 2. Troje et al., 2005. JoV. 3. Tsuchiya & Koch, 2005. Nat Neuro. 4. Troje, 2002. JoV. 5. Ramsøy & Overgaard, 2004. Phenom. & Cog Sciences. 6. Lange & Lappe, 2006. J Neuro. 7. Giese & Poggio, 2003. Nat Neuro. Conclusion We used gender processing in PLW as a proxy to probe conscious and nonconscious spatio-temporal integration. We found that the kinematics, but not the structure of visible & invisible PLW gave rise to specific gender priming. These results challenge one theoretical model suggesting that holistic spatial processing precedes temporal processing in PLW 6 , and comforts another one suggesting that PLW activate the motion, but not the form visual pathway 7 . Moreover, priming from slow kinematics was found in the visibile condition only, suggesting that temporal integration windows shrink in the absence of perceptual awareness.
Transcript of Nonconscious Adaptation to Spatial & Temporal … Adaptation to Spatial & Temporal Structure of...
Nonconscious Adaptation to Spatial & Temporal Structure of Biological MotionNathan Faivre1,* & Christof Koch1,2
1. California Institute of Technology 2. Allen Institute for Brain Science
Structure & Kinematic Structure Kinematic
Non-dominant eyeDominant eye Fixation
3-7s adaptor
0.2s blank
0.7s Target
Subjective Visibilty5
Objective Visibility
First walker?
Gender?
PLW ~ Point-Light WalkerA set of dots moving together can elicit a vivid percept of a male or a female walking. Gender can be defined by structural (e.g., shoulder-hip ratio), and/or kinematic cues(e.g., lateral body sway)1.
We measured how adaptor PLW could bias gender perception of ambiguous target PLW2, both in the presence and absence of perceptual awareness. We estimated both spatial and temporal integration, by respectively measuring such biases from structural and/or kinematic gender information.
Incremental drawings of PLW
1 + eβ(log(f) - log(ε))
1p(f) = Fit: logistic function:
1 2 3
0.00
0.25
0.50
0.75
1.00 p < .005
p < .01
1. Objective-Subjective Visibility
2. Repetition effects
4. Positive Shifts of Perceptual Subjective Equality
1. No experience | 2. Brief glimpse | 3. Almost clear image | 4. Perfectly clear image
InvisibleSlow kinematic
1.00
0.75
0.50
0.25
0.00
1.00
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0.50
0.25
0.00
Pro
port
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-3 -2 -1 0 1-3 -2 -1 0 1-3 -2 -1 0 1-3 -2 -1 0 1
1.5
1.0
0.5
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-1.0Perc
ep
tual S
hift
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ualit
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)
0.4
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0.8
1.0
Invisible - structure & kinematic
Invisible - kinematic
Invisible - structure
Invisible - slow kinematic
R2 = 0.616, p < 0.001
R2 = 0.663, p < 0.001
0.4
0.6
0.8
1.0
1 2 3 4 1 2 3 4
struc
ture &
kine
matic
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struc
ture
slow ki
nemati
c
kinem
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struc
ture &
kine
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struc
ture
slow ki
nemati
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kinem
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Visible Invisible
R2 = 0.226, p = 0.057
R2 = 0.173, p = 0.038
Obj
ectiv
e A
ccur
acy
Subjective Visibility Reports
Visiblestructure & kinematic
Visiblestructure
Visiblekinematic
Visibleslow kinematic
Invisiblestructure & kinematic
Invisiblestructure
Invisiblekinematic
Invisibleslow kinematic
Target gender (σ)
p < .005n=9
p = .61n=8
p < .02n=7
p < .05n=10
p < .001n=7
p = .69n=8
p < .02n=7
p = .33n=10
**
p < .001 p < .001 p < .001 p < .001 p = .42 p = .46 p = .34 p = .48
Visiblestructure & kinematic
Visiblestructure
Visiblekinematic
Visibleslow kinematic
Invisiblestructure & kinematic
Invisiblestructure
Invisiblekinematic
Invisibleslow kinematic
Obje
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ccu
racy
Visible
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−3 −2 −1 0 1
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Visible - 7sstructure & kinematic
Pro
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PSEf PSEm
Target gender (σ)
FemaleMale
FemaleMale
FemaleMale
3. Replication Troje et al.
PSE: Perceptual Subjective Equality
1 2 3
0.00
0.25
0.50
0.75
1.00
Number of prime repetitions
Introduction Results
References
AknowledgmentsFyssen Foundation | Mathers Foundation
Niko Troje, Queen's university
Paradigm
CFS3:0.08 ̊-1.16 ̊ circles; 10HzStimulus size:Dot diameter: .23 ̊; PLW: 2.6 ̊ x 7.1 ̊Michelson contrast: Adaptor = .08; Target = .36Female | Male definition:Adaptor: -7σ | +5σ; Target: -3σ | -2σ | -1σ | 0 | +1σ from the mean PLW4
1. Johansson, 1973. Percept & Psychophys. 2. Troje et al., 2005. JoV. 3. Tsuchiya & Koch, 2005. Nat Neuro. 4.Troje, 2002. JoV. 5. Ramsøy & Overgaard, 2004. Phenom. & Cog Sciences. 6. Lange & Lappe, 2006. J Neuro. 7.Giese & Poggio, 2003. Nat Neuro. Conclusion We used gender processing in PLW as a proxy to probe conscious and nonconscious spatio-temporal integration. We found that the kinematics,
but not the structure of visible & invisible PLW gave rise to specific gender priming. These results challenge one theoretical model suggesting that holistic spatial
processing precedes temporal processing in PLW6, and comforts another one suggesting that PLW activate the motion, but not the form visual pathway7. Moreover,
priming from slow kinematics was found in the visibile condition only, suggesting that temporal integration windows shrink in the absence of perceptual awareness.
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