This tool could show how consciousness works

2026-04-21 · Source: MIT Technology Review · Field: Science & Research — Life Sciences & Biology, Health & Medical Research, Research Methodology & Innovation · Depth: Expert, quick

Summary

MIT philosopher Matthias Michel, Lincoln Lab researcher Daniel Freeman, and their team have outlined a strategy to explore the neural basis of consciousness using transcranial focused ultrasound (TFUS). This noninvasive technology stimulates specific brain structures with acoustic waves, reaching deeper and with greater resolution than EEG or MRI. The researchers propose an experimental approach utilizing TFUS to test two competing theories of consciousness: the "cognitivist" concept, which posits conscious experience involves higher-level processes in the frontal cortex, and the "non-cognitivist" idea, suggesting subjective experiences arise from localized neural activity in subcortical structures or the posterior cortex. This method, detailed in a recent paper, aims to identify the brain circuits responsible for sensations like pain, vision, and complex thought.

Key takeaway

For neuroscientists and philosophers investigating the "hard problem" of consciousness, this proposed TFUS methodology offers a concrete experimental pathway. You can use this noninvasive tool to directly test hypotheses about where and how conscious experience emerges in the brain, potentially resolving long-standing debates between cognitivist and non-cognitivist theories. Consider integrating TFUS into your research designs to gain higher-resolution insights into deep brain structures.

Key insights

Transcranial focused ultrasound offers a noninvasive method to probe brain activity and test theories of consciousness.

Principles

• Consciousness may arise from higher-level or localized neural processes.
• Noninvasive brain stimulation can reveal functional brain mechanisms.

Method

TFUS sends acoustic waves through the skull to focus on millimeter-sized brain areas, stimulating specific structures to study their effects and test competing theories of consciousness.

In practice

• Stimulate specific brain regions to observe effects.
• Differentiate between cognitivist and non-cognitivist theories.

Topics

• Transcranial Focused Ultrasound
• Consciousness Research
• Cognitivist Theory
• Non-Cognitivist Theory
• Brain Stimulation

Best for: Research Scientist, AI Scientist

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Editorial summary, takeaway, and curation by AIssential. Original article published by MIT Technology Review.