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How the brain processes faces from sight to recognition

Date:
December 26, 2016
Source:
Carnegie Mellon University
Summary:
Researchers used highly sophisticated brain imaging tools and computational methods to measure the real-time brain processes that convert the appearance of a face into the recognition of an individual. They are hopeful that the findings might be used in the near future to locate the exact point at which the visual perception system breaks down in different disorders and injuries, ranging from developmental dyslexia to prosopagnosia, or face blindness.
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At a glance, you can recognize a friend's face whether they are happy or sad or even if you haven't seen them in a decade. How does the brain do this -- recognize familiar faces with efficiency and ease despite extensive variation in how they appear?

Researchers at Carnegie Mellon University are closer than ever before to understanding the neural basis of facial identification. In a study published in the Dec. 26, 2016 issue of the Proceedings of the National Academy of Sciences (PNAS), they used highly sophisticated brain imaging tools and computational methods to measure the real-time brain processes that convert the appearance of a face into the recognition of an individual. The research team is hopeful that the findings might be used in the near future to locate the exact point at which the visual perception system breaks down in different disorders and injuries, ranging from developmental dyslexia to prosopagnosia, or face blindness.

"Our results provide a step toward understanding the stages of information processing that begin when an image of a face first enters a person's eye and unfold over the next few hundred milliseconds, until the person is able to recognize the identity of the face," said Mark D. Vida, a postdoctoral research fellow in the Dietrich College of Humanities and Social Sciences' Department of Psychology and Center for the Neural Basis of Cognition (CNBC).

To determine how the brain rapidly distinguishes faces, the researchers scanned the brains of four people using magnetoencephalography (MEG). MEG allowed them to measure ongoing brain activity throughout the brain on a millisecond-by-millisecond basis while the participants viewed images of 91 different individuals with two facial expressions each: happy and neutral. The participants indicated when they recognized that the same individual's face was repeated, regardless of expression.

The MEG scans allowed the researchers to map out, for each of many points in time, which parts of the brain encode appearance-based information and which encode identity-based information. The team also compared the neural data to behavioral judgments of the face images from humans, whose judgments were based mainly on identity-based information. Then, they validated the results by comparing the neural data to the information present in different parts of a computational simulation of an artificial neural network that was trained to recognize individuals from the same face images.

"Combining the detailed timing information from MEG imaging with computational models of how the visual system works has the potential to provide insight into the real-time brain processes underlying many other abilities beyond face recognition," said David C. Plaut, professor of psychology and a member of the CNBC.


Story Source:

Materials provided by Carnegie Mellon University. Note: Content may be edited for style and length.


Journal Reference:

  1. Mark D. Vida, Adrian Nestor, David C. Plaut, and Marlene Behrmann. Spatiotemporal dynamics of similarity-based neural representations of facial identity. PNAS, December 27, 2016 DOI: 10.1073/pnas.1614763114

Cite This Page:

Carnegie Mellon University. "How the brain processes faces from sight to recognition." ScienceDaily. ScienceDaily, 26 December 2016. <www.sciencedaily.com/releases/2016/12/161226211228.htm>.
Carnegie Mellon University. (2016, December 26). How the brain processes faces from sight to recognition. ScienceDaily. Retrieved May 25, 2017 from www.sciencedaily.com/releases/2016/12/161226211228.htm
Carnegie Mellon University. "How the brain processes faces from sight to recognition." ScienceDaily. www.sciencedaily.com/releases/2016/12/161226211228.htm (accessed May 25, 2017).

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