We are delighted to share that Guillermo Sánchez-Garrido Campos has successfully defended his doctoral thesis, earning the highest distinction: sobresaliente cum laude. This achievement marks a major milestone in Guille’s scientific career and a proud moment for our lab.
His thesis, titled “Modulation of Cortical Excitability and Oscillatory Dynamics by Transcranial Electrical Stimulation”, was directed by Prof. Javier Márquez Ruiz and defended in Seville on December 5, 2025. The work provides a rigorous and integrative mechanistic framework for understanding how transcranial electrical stimulation (tES)—including tDCS and tACS—modulates neuronal and network dynamics in the brain.
🔬 About the thesis
In this dissertation, Guillermo investigates how the efficacy of tES depends on three fundamental factors:
- The anatomical alignment of neurons with the electric field,
- The oscillatory state of the brain, and
- The interaction between stimulation parameters and neuronal subtype.
These results deepen our mechanistic understanding of how neuronal morphology, network dynamics, and oscillatory context interact to shape the outcomes of electrical neuromodulation, offering important implications for designing personalized and brain-state-sensitive stimulation protocols.
👩‍⚖️ Thesis Committee
The examination panel was composed of three distinguished researchers whose insightful questions and discussion enriched the defense:
- PRESIDENTE: Dr. Marco Cambiaghi
UniversitĂ di Verona (Verona, Italy)
Assistant Professor in tenure track (RtD-B) - SECRETARIO: Dr. Raudel Sánchez Campusano
Universidad Pablo de Olavide (Seville, Spain)
Associate Professor (Profesor Titular de Universidad) - VOCAL: Dr. Claudia Ammann
Universidad Camilo José Cela / HM CINAC (Madrid, Spain)
Senior Postdoctoral Researcher
🎉 A well-deserved celebration
Guillermo’s thesis represents years of dedication, creativity, and technical mastery in brain stimulation research.
Huge congratulations, Guille! Your work marks an important contribution to the field, and we are excited to follow your next steps in neuroscience.
Brain Stim Lab 
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