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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Human-Computer Interaction

Background:

  • Digital communication commonly uses emoticons, like :-), to convey emotions.
  • The neural mechanisms underlying emoticon perception, specifically their relation to face perception, remain unclear.
  • Face perception relies on configural processing in the occipitotemporal cortex, detectable via the N170 event-related potential.

Purpose of the Study:

  • To investigate whether emoticons trigger face-specific neural mechanisms.
  • To examine how the N170 event-related potential is affected by emoticon orientation.
  • To compare the processing of emoticons with that of actual faces and meaningless character strings.

Main Methods:

  • Recorded N170 event-related potentials in 20 participants.
  • Presented participants with upright and inverted faces, emoticons, and meaningless character strings.
  • Analyzed N170 amplitude and latency differences across stimuli types and orientations.

Main Results:

  • Upright emoticons elicited a large N170 amplitude, decreasing when inverted, mirroring the pattern for faces.
  • Inverted emoticons showed a reduced N170 amplitude compared to upright emoticons.
  • The N170 pattern for emoticons differed from that of inverted faces, suggesting distinct processing pathways for facial features.

Conclusions:

  • Emoticons, when upright, are processed in occipitotemporal regions similarly to faces due to their familiar configuration.
  • The specific character features of emoticons are not processed by the same lateral facial feature detection systems used for inverted faces.
  • Emoticon perception engages some face-specific mechanisms but also involves distinct processing routes, particularly for their constituent characters.