N170
Brain response to faces / From Wikipedia, the free encyclopedia
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The N170 is a component of the event-related potential (ERP) that reflects the neural processing of faces, familiar objects or words.[1] Furthermore, the N170 is modulated by prediction error processes.[2][3]
When potentials evoked by images of faces are compared to those elicited by other visual stimuli, the former show increased negativity 130-200 ms after stimulus presentation. This response is maximal over occipito-temporal electrode sites, which is consistent with a source located at the fusiform and inferior-temporal gyri, confirmed by electrocorticography.[4][5] The N170 generally displays right-hemisphere lateralization and has been linked with the structural encoding of faces, hence is considered to be primarily sensitive to faces.[6][7] A study, employing transcranial magnetic stimulation combined with EEG, found that N170 can be modulated by top-down influences from prefrontal cortex.[8]