EEG theta responses induced by emoji semantic violations

Area of Science:

• Neuroscience
• Cognitive Science
• Psycholinguistics

Background:

• The semantic processing of linguistic information is well-studied using electroencephalography (EEG).
• Emojis are increasingly used in digital communication, but their cognitive processing remains less understood.
• Understanding how the brain processes emojis is crucial for digital communication research.

Purpose of the Study:

• To investigate the neural correlates of emoji semantic processing.
• To compare the brain's response to incongruent emojis versus incongruent words within sentences.
• To determine if emoji processing involves different cognitive mechanisms than word processing.

Main Methods:

• Event-related electroencephalogram (EEG) power changes were measured.
• Participants processed sentences ending with contextually consistent or inconsistent words or emojis.
• Theta power (4-7 Hz) was analyzed across different brain regions.

Main Results:

• Incongruent emojis significantly increased theta power, particularly in midfrontal, occipital, and temporal lobes.
• Incongruent words, conversely, decreased theta power.
• The spatial distribution of the theta power increase differed between emojis and words.

Conclusions:

• Emoji semantic processing appears to engage distinct neuro-cognitive mechanisms compared to word processing.
• Increased theta power suggests higher working memory load, error monitoring, and retrieval difficulties for incongruent emojis.
• This research highlights the unique cognitive demands of processing visual semantic information like emojis.