Electrophysiological markers of pre-lexical speech processing: evidence for bottom-up and top-down effects on spoken word processing.
The present study was designed to investigate the electrophysiological consequences of a mismatch between initial phoneme expectations and the actual spoken input. Participants were presented with a word/nonword prompt with the instruction to delete the initial sound (e.g., snap without the /s/; snoth without the /s/) and determine the resulting segment. Following the prompt, an aurally presented response that matched/mismatched expectations (e.g., nap/tap; noth/toth) was presented. The Phonological Mapping Negativity (PMN), a response associated with phonological processing, was largest to mismatching responses, and was not dependent on the lexical status of response items. An N400-like response was also largest to mismatching responses; however, in contrast to the PMN, the N400-like response differentiated mismatching words from mismatching nonwords. These findings highlight a functional dissociation between the PMN and N400, and establish the PMN as a neural marker representing the goodness-of-fit between initial phoneme expectations and the actual spoken input.
Department of Psychology, Acadia University, Wolfville, NS, Canada. randy.newman@acadiau.ca
R L
RL
Newman
J F
JF
Connolly
D000161:Acoustic Stimulation; D000328:Adult; D015415:Biomarkers; D001931:Brain Mapping; D003463:Cues; D003627:Data Interpretation, Statistical; D004569:Electroencephalography; D005071:Evoked Potentials / Q000502:physiology; D005260:Female; D006801:Humans; D008297:Male; D011578:Psycholinguistics; D011597:Psychomotor Performance / Q000502:physiology; D011930:Reaction Time / Q000502:physiology; D013067:Speech Perception / Q000502:physiology*; D055815:Young Adult
D015415:Biomarkers