Neural signatures of visual word form perception in an ... files/Pitts... · Neural signatures of...
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Neural signatures of visual word form perception in an inattentional blindness
paradigm
Michael Pitts, Kathryn Schelonka, & Enriqueta Canseco-Gonzalez Psychology Department
Reed College, Portland OR, USA
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The 3 NCC problem
When contrasting “aware” vs. “unaware” conditions, it’s difficult to distinguish…
Preconscious processing (necessary but not sufficient) & Postperceptual processing (sufficient but not necessary)
from…
NCC-proper (necessary and sufficient)
Aru et al. (2012) NeuroBioRev; de Graaf et al. (2012) NeuroBioRev
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Paradigm comparison
Pitts, Metzler, & Hillyard (2014) Front Psych
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Inattentional Blindness (IB) paradigm
Video example of stimuli: https://youtu.be/FONIOaZXzEg
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Inattentional Blindness (IB) paradigm
600-800ms 600-800ms 300ms
Time-lock ERPs
Scrambled Scrambled
Words (22.5%) Consonants (22.5%)
Scrambled (45%) Animal Words (10%)
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Procedure Phase 1:
Distracter Task
(unaware)
Phase 2:
Distracter Task
(aware)
Phase 3:
Word Recognition Task
(aware + relevant)
Awareness Assessment
Awareness Assessment
# of stimuli per phase: Words: 180 Consonants: 180 Scrambled: 360 Animal Words: 80
• IB to shapes: Pitts, Martinez, & Hillyard (2012) JCogNeuro • IB to faces: Shafto & Pitts (in press) JNeurosci
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Paradigm comparisons
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Phase 1:
Distracter Task
(unaware)
Phase 2:
Distracter Task
(aware)
Phase 3:
Word Recognition Task
(aware + relevant)
Main Questions:
• N250 and N400 during inattentional blindness (Phase 1)? (Appelbaum et al., 2009; Luck, Vogel, & Shapiro, 1996)
• P300 when subjects are aware of words (Phase 2) or only when words must be reported (Phase 3)? (Dehaene & Changeux, 2011)
• ERPs uniquely associated with awareness (Phase 2 vs. Phase 1), e.g. visual awareness negativity (VAN)? (Railo, Koivisto, & Revonsuo, 2011)
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Phase 1 (unaware, task irrelevant)
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Phase 1 (unaware, task irrelevant)
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Phase 2 (aware, task irrelevant)
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Phase 2 (aware, task irrelevant)
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Phase 3 (aware, task relevant)
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Phase 3 (aware, task relevant)
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Phase 3 (aware, task relevant)
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Summary N250 and N400 regardless of whether subjects are aware of the
word forms. Phase 1 (unaware, task irrelevant)
VAN (and word vs. consonant ERP difference) only when subjects
are aware of the word forms. Phase 2 (aware, task irrelevant)
Frontal activity and P300 only when words are task relevant.
Phase 3 (aware, task relevant)
preconscious processing
NCC proper ?
postperceptual processing
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Conclusions & Future Directions
Results consistent with our previous IB experiments (shapes, faces)
extensive preconscious processing during IB
wide-spread cortical “ignition” only when percepts are reported
modest effects related to awareness per se
IB paradigm shows promise for addressing 3 NCC problem
results are “theory-of-consciousness-agnostic”
Try IB paradigm with fMRI, ECoG, TMS, tDCS, fNIRS, etc. …?
VAN
~200-300ms
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Thank you for your attention and awareness! Collaborators: Steve Hillyard Antígona Martínez Enriqueta Canseco-Gonzalez Kathryn Schelonka Chris Graulty Juliet Shafto Jennifer Padwal Daniel Fennelly Stephen Metzler
Funding: KIBM NIMH NSF Reed College
www.reed.edu/psychology/scalp
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IB subjects Noticer subjects
Phase 1
Phase 2