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Neural processing of language in the absence of auditory input
Naja Ferjan RamirezIn collaboration with Matt Leonard, Christina Torres, Marla
Hatrak, Eric Halgren, & Rachel Maybery
Mayberry LabMultimodal Imaging Lab
Cognitive Neuroscience 2013 Spring Retreat & Kavli Institute for Brain and Mind Symposium
AUDITORY WORDS WRITTEN WORDS
• Are the neural underpinnings of word meaning dependent on auditory language experience?– Congenitally deaf individuals receive no auditory input– Some acquire sign language as their native language from birth
Is the meaning of ASL signs in deaf native signers processed like the meaning of auditory & written words in hearing people (i.e. left dominant, fronto-temporal areas)?
Early stages = modality specific
Later stages = modality independent?Left dominant lexico-semantic network
Marinkovic et al. 2003
100 200 300 400 500 600
ms
ampl
itude
700
Word Onset
Average waveform from single MEG sensor
- Deaf native signers (n=11) watch ASL signs
- Hearing English speakers (n=8) listen to English words
Anatomically constrained Magnetoencephalography
Integrating MEG (temporal resolution)…
100 200 300 400 500 600
ms700
… with MRI (spatial resolution)
Method: Dale et al, 2000
Sensory processing: Modality specific
Lexico-semantic processing:Independent of modality through which early language is received
Neural systems for high-level language processing are supramodal!
Sign in native deaf 300-350 ms
Speech in hearing 300-350 ms
Thank you!
NSF BCS-0924539NIH RO1DC012797