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Related Concept Videos

Brain Imaging01:14

Brain Imaging

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Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans),  magnetic resonance imaging (MRI),  functional magnetic resonance imaging (fMRI), and Transcranial Magnetic...
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Using transcranial direct current stimulation (tDCS) to selectively modulate the face inversion effect and N170

Ciro Civile1, Emika Waguri1, I P L McLaren1

  • 1University of Exeter, UK.

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Anodal transcranial direct current stimulation (tDCS) combined with electroencephalography (EEG) modulated face perception. This neurostimulation technique influenced the face inversion effect and N170 brainwave component, advancing perceptual learning insights.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology

Background:

  • Perceptual learning, particularly the face inversion effect, is crucial for recognizing familiar faces.
  • The N170 event-related potential component is sensitive to face perception and is modulated by learning.
  • Combining transcranial direct current stimulation (tDCS) with electroencephalography (EEG) offers a powerful approach to investigate neural mechanisms of perception.

Purpose of the Study:

  • To investigate how anodal tDCS applied to the Fp3 scalp area modulates perceptual learning, specifically the face inversion effect.
  • To examine the relationship between behavioural measures of the face inversion effect and the N170 component (latency and amplitude) under tDCS.
  • To elucidate the neural mechanisms underlying tDCS-induced changes in face perception.

Main Methods:

  • A large study (n=72) employed combined tDCS-EEG.
  • Participants performed an old/new recognition task with upright, inverted, normal, and Thatcherized faces.
  • Anodal tDCS was delivered to the Fp3 area with the reference electrode at Fp2, compared against a sham condition.

Main Results:

  • Anodal tDCS at Fp3 increased the behavioural face inversion effect for normal faces compared to sham.
  • This behavioural change covaried with modulation of the N170 component.
  • A dissociation was observed: tDCS reduced N170 latency and amplitude, but behavioural modulation tracked N170 amplitude, not latency.

Conclusions:

  • tDCS can modulate perceptual learning of faces, specifically impacting the behavioural face inversion effect.
  • The N170 amplitude is a key neural correlate of tDCS-induced behavioural changes in face perception.
  • A dissociation exists between N170 amplitude and latency in response to tDCS, offering nuanced insights into perceptual learning mechanisms.