Pre-Stimulus Activity of Left and Right TPJ in Linguistic Predictive Processing: A MEG Study

Area of Science:

• Neuroscience
• Cognitive Science
• Psycholinguistics

Background:

• The temporoparietal junction (TPJ) is implicated in attention, theory of mind, and predictive processing.
• Prior precision, a key aspect of predictive processing, relates to prediction reliability and alpha power.
• The role of TPJs in predictive processing, particularly concerning alpha oscillations, remains underexplored.

Purpose of the Study:

• Investigate if spontaneous alpha power oscillations in the left and right TPJs modulate brain responses during a linguistic prediction task.
• Examine brain activity using magnetoencephalography (MEG) during literal and non-literal sentence processing.

Main Methods:

• Magnetoencephalography (MEG) was employed to measure brain activity.
• Spontaneous pre-stimulus alpha power in the left and right TPJs was analyzed.
• Brain responses during a linguistic task involving predictive processing were recorded.

Main Results:

• Pre-stimulus alpha power in the right TPJ correlated with post-stimulus responses in the left superior temporal gyrus.
• Pre-stimulus alpha power in the left TPJ correlated with post-stimulus activity in Broca's area, left middle temporal gyrus, and left superior temporal gyrus.

Conclusions:

• Both right and left TPJs play a role in linguistic prediction.
• These roles involve a network of core language regions.
• Observed differences across TPJs and linguistic conditions are consistent with predictive processing frameworks.