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Neural substrates of tactile imagery: a functional MRI study

DOI: 10.1097/00001756-200303240-00011
Yoo, S.-S., Freeman, D. K., McCarthy, J. J., & Jolesz, F. A. (2003). Neural substrates of tactile imagery: a functional mri study. NeuroReport, 14(4), 581–585. doi:10.1097/00001756-200303240-00011

Abstract

fMRI investigation on the neural substrates involved in tactile imagery is reported. Healthy subjects performed mental imagery of tactile stimulation on the dorsal aspect of the right hand. The results were compared with the regions of activation during the actual tactile stimulation. During imagery, contralateral primary and secondary somatosensory areas were activated along with activation in the left parietal lobe. Activations in left inferior frontal gyri (Brodmann's area 44), left dorsolateral prefrontal area, left precentral gyrus, left insula, and medial frontal gyrus were also observed. In the basal ganglia, activation in the left thalamus (ventral posteromedial nucleus) and putamen was found. Our results suggest that the primary and secondary somatosensory areas are recruited during tactile imagery, and have partially overlapping neural substrates for the perception of tactile stimulation.

Authors

  • Seung-Schik Yoo1
  • Daniel K. Freeman1
  • James J. McCarthy1
  • Ferenc A. Jolesz1

What This Study Is About

Researchers wanted to know if imagining a physical sensation—like a soft brush against your skin—uses the same "wiring" in the brain as actually feeling it. They were looking for the brain’s map for tactile imagery (the ability to "feel" textures or touch in your mind).

How They Studied It

The team recruited 13 volunteers and put them in an fMRI scanner, a giant magnet that maps brain activity by looking at blood flow.
Inside the scanner, participants did two things:
1. The Real Thing: A researcher brushed the back of the participant's hand with a tiny plastic fiber.
2. The Imagined Thing: The participant was asked to "feel" that same brushing sensation using only their imagination.
The researchers then compared the brain maps of the real touch versus the imagined touch.

What They Found

The study discovered that imagining a touch is like running a "low-power" simulation of the real thing.
  • Shared Space: Imagining the touch activated the same sensory parts of the brain that light up when you are actually being touched.
  • The Difference: Real touch was much "louder" in the brain and spread across both sides. Imagined touch was quieter and mostly stayed on one side.
  • Thinking Power: When imagining, the brain also used "control centers" (like the prefrontal cortex) to help create the sensation, which didn't happen as much during the real touch.

What This Might Mean

This suggests that our brains use a shared network for both "feeling" and "imagining." For people with aphantasia—the inability to create mental images—this is fascinating because many "aphants" also report a lack of mental touch or "feeling" sensations in their heads.
However, we have to be careful: this was a very small study with only 11 successful participants. While it *suggests* how the mind's touch works, we need much larger studies to *prove* how this differs in people with aphantasia.

One Interesting Detail

The researchers actually had to remove two people from the study because they found it too difficult and frustrating to imagine the sensation! This highlights how everyone’s "mental toolbox" is different—some people can "feel" an imaginary brush easily, while for others, the cupboard is bare.
This summary was generated by AI and may contain errors. Always refer to the original paper for accuracy.