A new technique developed by neuroscientists at U of T Scarborough can, for the first time, reconstruct images of what people perceive based on their brain activity gathered by EEG.
The technique developed by Dan Nemrodov, a postdoctoral fellow in Assistant Professor Adrian Nestor’s lab at U of T Scarborough, is able to digitally reconstruct images seen by test subjects based on electroencephalography (EEG) data.
“When we see something, our brain creates a mental percept, which is essentially a mental impression of that thing. We were able to capture this percept using EEG to get a direct illustration of what’s happening in the brain during this process,” says Nemrodov.
For the study, test subjects hooked up to EEG equipment were shown images of faces. Their brain activity was recorded and then used to digitally recreate the image in the subject’s mind using a technique based on machine learning algorithms.
It’s not the first time researchers have been able to reconstruct images based on visual stimuli using neuroimaging techniques. The current method was pioneered by Nestor who successfully reconstructed facial images from functional magnetic resonance imaging (fMRI) data in the past, but this is the first time EEG has been used.
And while techniques like fMRI – which measures brain activity by detecting changes in blood flow – can grab finer details of what’s going on in specific areas of the brain, EEG has greater practical potential given that it’s more common, portable, and inexpensive by comparison. EEG also has greater temporal resolution, meaning it can measure with detail how a percept develops in time right down to milliseconds, explains Nemrodov.
“fMRI captures activity at the time scale of seconds, but EEG captures activity at the millisecond scale. So we can see with very fine detail how the percept of a face develops in our brain using EEG,” he says. In fact, the researchers were able to estimate that it takes our brain about 170 milliseconds (0.17 seconds) to form a good representation of a face we see.
This study provides validation that EEG has potential for this type of image reconstruction notes Nemrodov, something many researchers doubted was possible given its apparent limitations. Using EEG data for image reconstruction has great theoretical and practical potential from a neurotechnological standpoint, especially since it’s relatively inexpensive and portable.
In terms of next steps, work is currently underway in Nestor’s lab to test how image reconstruction based on EEG data could be done using memory and applied to a wider range of objects beyond faces. But it could eventually have wide-ranging clinical applications as well.
“It could provide a means of communication for people who are unable to verbally communicate. Not only could it produce a neural-based reconstruction of what a person is perceiving, but also of what they remember and imagine, of what they want to express,” says Nestor.
“It could also have forensic uses for law enforcement in gathering eyewitness information on potential suspects rather than relying on verbal descriptions provided to a sketch artist.”
The research, which is published in the journal eNeuro, was funded by the Natural Sciences and Engineering Research Council of Canada (NSERC) and by a Connaught New Researcher Award.
“What’s really exciting is that we’re not reconstructing squares and triangles but actual images of a person’s face, and that involves a lot of fine-grained visual detail,” adds Nestor.
“The fact we can reconstruct what someone experiences visually based on their brain activity opens up a lot of possibilities. It unveils the subjective content of our mind and it provides a way to access, explore and share the content of our perception, memory and imagination.”
The Latest on: Neuroimaging
via Google News
The Latest on: Neuroimaging
- Todos and Amarantus JV Announces Full Enrollment for Clinical Trial of LymPro Alzheimer’s Blood Test Relationship with Amyloid PETon November 14, 2019 at 4:40 pm
Breakthrough completed a 20-subject clinical study (LymPro PET 1) in 2018 evaluating the correlation between LymPro scores and the diagnosis of Alzheimer’s disease, as confirmed with amyloid PET ...
- Todos and Amarantus JV Announces Full Enrollment for Clinical Trial of LymPro Alzheimer’s Blood Test Relationship withon November 14, 2019 at 8:05 am
amarantus logo.jpg Breakthrough completed a 20-subject clinical study (LymPro PET 1) in 2018 evaluating the correlation between LymPro scores and the diagnosis of Alzheimer’s disease, as confirmed ...
- Boys' and Girls' Brains the Same When It Comes to Mathon November 12, 2019 at 2:17 pm
Boys and girls start out on the same biological footing when it comes to math, according to the first neuroimaging study of math gender differences in children. The studies add more fuel to the ...
- Meta-analysis of reward processing in major depressive disorder reveals distinct abnormalities within the reward circuiton November 11, 2019 at 8:31 am
Many neuroimaging studies have investigated reward processing dysfunction in major depressive disorder. These studies have led to the common idea that major depressive disorder is associated with ...
- A passion for cognitive neuroscience and neuroimagingon November 9, 2019 at 2:40 am
Holly Brown (pictured) is a final year PhD student in cognitive neuroscience and neuroimaging at the University of York. Her research is assessing the impact of sight loss on the brain. She is ...
- Tracking Brain Development and Dimensional Psychiatric Symptoms in Children: A Longitudinal Population-Based Neuroimaging Studyon October 31, 2019 at 5:00 pm
Most neuroimaging models tend to explain brain differences observed in psychopathology as an underlying (causal) neurobiological substrate. However, the present work suggests that future neuroimaging ...
- Neuroimaging reveals hidden communication between brain layers during readingon October 1, 2019 at 9:33 am
Language involves many different regions of the brain. Researchers have discovered previously hidden connections between brain layers during reading, in a neuroimaging study. The team used laminar ...
- Neuroimaging reveals hidden communication between brain layers during readingon October 1, 2019 at 7:41 am
Researchers from the Max Planck Institute for Psycholinguistics and the Donders Institute at Radboud University discovered previously hidden connections between brain layers during reading, in a ...
- Neuroimaging reveals hidden communication between brain layers during readingon October 1, 2019 at 6:43 am
A research team led by Daniel Sharoh from the Donders Center for Cognitive Neuroimaging at Radboud University Nijmegen, Kirsten Weber (Radboud University, MPI), David Norris (Radboud University, MPI), ...
- Replication Refutes Study Linking Neuroimaging to Geneticson September 30, 2019 at 10:55 am
A new study casts doubt on the utility of combining neuroimaging and genetics in hopes of understanding the genetic underpinnings of cognition. The researchers report today (September 30) in the ...
via Bing News