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Parietal theta burst TMS does not modulate bistable perception.

Georg Schauer^1,2,3, Pablo Rodrigo Grassi^1,2,3, Alireza Gharabaghi⁴

¹Department of Psychology, University of Tübingen, Schleichstraße 4, Tübingen 72076, Germany.

Neuroscience of Consciousness

|March 28, 2024

Summary

Continuous theta-burst stimulation (cTBS) over the parietal cortex may not reliably alter bistable perception. This study found inconsistent results, questioning cTBS

Keywords:

TMS bistable perception multistability parietal cortex theta-burst stimulation

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Area of Science:

Cognitive Neuroscience
Neuroscience
Perception

Background:

The parietal cortex's role in perceptual awareness and ambiguity resolution is debated.
Transcranial magnetic stimulation (TMS) studies suggest a causal link, but reliability concerns persist.
Prior research on continuous theta-burst stimulation (cTBS) effects on bistable perception shows conflicting outcomes.

Purpose of the Study:

To investigate the reliability of cTBS applied to the parietal cortex for modulating bistable perception.
To replicate and assess previous findings on parietal cTBS and perceptual ambiguity.

Main Methods:

Conducted three cTBS experiments on parietal cortex using matched stimuli, protocols, and target sites from prior studies.
Employed a larger participant group than in previous investigations.
Utilized individual functional localizers in one experiment.

Main Results:

None of the three cTBS experiments successfully replicated prior findings.
One experiment with individual functional localizers yielded weak effects.
Two experiments produced null results, indicating no significant effect.
Variability in motor cortex cTBS did not predict parietal cTBS outcomes.

Conclusions:

cTBS appears unreliable for modulating bistable perception when targeting the parietal cortex.
The findings challenge the robustness of previous conclusions drawn from parietal TMS studies.
Further research is needed to understand the variability of cTBS effects in cognitive neuroscience.