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Fixation location on upright and inverted faces modulates the N170
Peter de Lissa1, Genevieve McArthur1, Stefan Hawelka2
1Department of Cognitive Science, ARC Centre for Cognition and its Disorders, Macquarie University, NSW 2109, Australia.
Neuropsychologia
|March 11, 2014
Summary
This study shows that where you look on a face, like the eyes or mouth, affects brain activity (N170 response). Face inversion also impacts this response, especially when viewing the mouth.
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Electrophysiology
Background:
- The N170 component of event-related potentials (ERPs) is a key neural marker for face perception.
- Understanding how specific facial features and their spatial arrangement influence early visual processing is crucial.
Purpose of the Study:
- To investigate the impact of fixation location (eyes vs. mouth) on the N170 response to upright and inverted faces.
- To examine how face inversion modulates the N170 based on fixation point and spatial location.
Main Methods:
- Utilized event-related potentials (ERPs) with a variable viewing position paradigm (VVPP).
- Directed participant fixations to specific facial regions (eyes or mouths) of upright and inverted faces.
- Compared N170 responses to faces versus non-face objects (wristwatches).
Main Results:
- The N170 was significantly larger for faces compared to non-face objects.
- Face inversion delayed and enhanced the N170 response.
- Fixating on the eyes elicited a larger N170 than fixating on the mouth, regardless of face orientation.
- The N170 face inversion effect was more pronounced when fixations were directed to the mouth.
Conclusions:
- The point of fixation within a face critically modulates early neural responses (N170).
- Both facial features and their spatial configuration contribute to the observed N170 modulations.
- These findings highlight the complex interplay between feature processing and spatial layout in face perception.
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