Personalizing Electroconvulsive Therapy: How Brain Structure Shapes Seizures and Outcomes

By Joao L. de Quevedo, MD, PhD, Director, Center for Interventional Psychiatry UTHealth Houston
April 10, 2026

a photo of a brain with electricity pulses

Rethinking One of Psychiatry’s Most Effective Treatments

Electroconvulsive therapy (ECT) remains one of the most effective treatments for severe and treatment-resistant depression. Yet, a fundamental question has persisted for decades:

👉 Why do therapeutic seizures work—and why do they work differently across patients?

A recent study published in Molecular Psychiatry provides important new insights, showing that individual differences in brain structure may influence how seizures are generated during ECT and how patients respond to treatment.

Moving Toward Precision ECT

ECT is traditionally delivered using standardized protocols, with clinicians adjusting stimulation dose based on seizure threshold and clinical response.

However, this study suggests that:

👉 The brain’s baseline anatomy plays a key role in how ECT works

Using MRI data from 166 patients with treatment-resistant depression, researchers examined how brain morphometry (structure) relates to:

  • Stimulation dose (charge)
  • Seizure duration
  • Antidepressant response

Key Findings

Brain Structure Influences Stimulation Needs

The amount of electrical charge required to induce seizures was associated with cortical surface area and regional brain volumes, particularly:

  • Areas near electrode placement
  • Temporal and frontal regions
  • Thalamic and hippocampal structures

This suggests that individual anatomy affects how electrical current propagates through the brain.

The Temporal Lobe Plays a Central Role

One of the most important findings was the role of right anteromedial temporal structures, including:

  • Amygdala
  • Hippocampus

Electrical field strength in these regions was associated with antidepressant response and even mediated the relationship between cortical structure and treatment outcome.

👉 This points to the temporal lobe as a key target in therapeutic ECT effects.

Seizure Duration Alone Is Not the Answer

While seizure duration has historically been used as a clinical marker, this study reinforces that:

👉 Seizure duration is not strongly predictive of antidepressant response

Instead, outcomes appear to depend more on:

  • Where stimulation reaches in the brain
  • How brain networks are engaged

ECT Is More Than “Triggering a Seizure”

The findings challenge a simplistic view of ECT:

👉 It is not just about inducing a seizure—it is about how electrical stimulation interacts with specific brain circuits

In particular:

  • Cortical regions near electrodes influence stimulation threshold
  • Deep structures (amygdala, hippocampus) influence therapeutic effects

Clinical Implications

This study has important implications for how we think about ECT in practice:

1️. Toward Personalized Dosing

Instead of a one-size-fits-all approach, ECT dosing could be tailored based on:

  • Head anatomy
  • Brain structure
  • Predicted electrical field distribution

2️. Improving Outcomes

Targeting stimulation more effectively could:

  • Increase antidepressant response rates
  • Reduce non-response
  • Optimize treatment efficiency

3️. Reducing Side Effects

Higher stimulation doses are associated with cognitive side effects.

👉 Personalized dosing may allow us to minimize exposure while maximizing benefit

4️. Integrating Neuroimaging Into Practice

This work supports a future where:

  • MRI-based modeling guides treatment
  • Electrical field simulations inform electrode placement and dosing

UTHealth Houston Perspective

At the Center for Interventional Psychiatry at UTHealth Houston, we are actively advancing:

  • Precision neuromodulation approaches
  • Integration of neuroimaging and clinical decision-making
  • Development of individualized treatment pathways for TRD and DTD

This study aligns directly with our mission:

To move from standardized protocols toward personalized, circuit-based treatments in psychiatry

Final Thoughts

ECT has long been one of the most powerful tools in psychiatry—but also one of the least understood mechanistically.

This study represents a significant step forward:

  • Linking brain structure → electrical stimulation → clinical response
  • Providing a framework for precision ECT
  • Moving the field closer to personalized interventional psychiatry

For patients, this evolution holds real promise:

More effective treatments, delivered more precisely, with fewer side effects

Reference

Leaver AM, Abbott CC, Espinoza RT, Narr KL. Brain morphometry, stimulation charge, and seizure duration in electroconvulsive therapy. Molecular Psychiatry. 2026;31:2094–2105.

Contact

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Disclaimer

This article was created with the assistance of artificial intelligence (AI) to help organize and refine the presentation of scientific information. All medical and scientific content has been reviewed and approved by Joao L. de Quevedo, MD, PhD, Executive Director of the Center for Interventional Psychiatry at the John S. Dunn Behavioral Sciences Center at UTHealth Houston. The content is intended for educational and informational purposes only and does not substitute for professional medical advice.