Researchers study how the brain processes images


For Greene County News

FAIRBORN — The student dons a red and blue skullcap studded with electrodes. She sits before a monitor inside a sealed chamber as images of human faces, motorcycles and church sanctuaries flash before her eyes. Just outside, researchers are locked into her brain waves, which light up their computers.

Things are humming in Wright State University’s new cognitive neuroscience lab, a state-of-the-art facility that promises to unlock the mysteries of how the human brain interprets visual images. Potential applications range from treating dyslexia and attention deficit hyperactivity disorder to training military pilots and operators of unmanned aerial vehicles.

Cognitive neuroscience is an academic field that addresses the relationship between the brain and behavior through perception, memory and attention.

The lab, housed on the fourth floor of Fawcett Hall, was built by assistant psychology professor and cognitive neuroscientist Assaf Harel, who studies how the brain uses visual images to extract information about the environment and make sense of the world.

“We are visual animals,” said Harel.

Harel received his doctorate in cognitive neuropsychology from the Hebrew University of Jerusalem (Israel), where he studied expertise in visual object recognition. He did postdoctoral work at the National Institute of Mental Health, studying visual recognition using functional, cutting-edge MRI analysis techniques. He joined the faculty at Wright State in 2014.

Harel is directly recording brain measurements, which has the great advantage of not having to rely upon verbal reports of the subjects, which can be biased.

“Extracting meaning from the environment is a very difficult computational problem,” he said. “If you have a computer trying to understand the world — trying to have the rich experience that we have and make fine discriminations we can make — it’s going to fail dismally.”

But a computer can be programmed to focus on how visual images affect brainwaves. An electroencephalogram (EEG) is used to track and record brain wave patterns through electrodes placed on the scalp that send signals to the computer.

The chamber in the lab is plated with metal designed to filter out any electrical frequencies or interferences that could hamper the recording of data. Brain responses measured by the 64-electrode cap stream through an amplifier and a fiberoptic connection enroute to a bank of computers that display the EEG waves.

“It’s noninvasive and a direct measurement of the brain activity,” Harel said. “It has all of the great advantages of studying the relationship between the brain and behavior.”

Researchers can measure how the brain responds differently to images of faces and non-face objects, how quickly the brain recognizes images and how the brain recognizes large spatial images such as mountain ranges and deserts. It boils down to discovering where and when in the brain different visual processes occur.

“What I think we will reveal is that vision is a very interactive process — where what you think, what you expect, what you need to do with the visual information actually constrains and leads you to particular interpretations,” Harel said. “You don’t see with your eyes. We’re not cameras. We’re actually cognitive agents, and we’re actually seeing with our brains.”

The images not only include faces, but landscapes such as mountains, beaches and forests and objects like motorcycles and roller skates. Some of the images are upside down.

“Things have a particular structure, and if you invert them you mess around with that structure,” Harel said. “You are going to have a harder time memorizing the face and responding to it. The question is whether that causes a difference in the brain waves.”

Results of the research could potentially be used to address attention deficits.

“You could really hone in and focus on particular markers of attention, then ask what particular aspects are impaired,” he said. “You could also use it as a training tool and enhance attention.”

For example, a UAV operator whose cognitive abilities are eroded by long hours could be prompted to refocus if an EEG detected flagging attention.

The new lab will be shared with any Wright State college or department such as engineering, science, math and medicine that need EEG data for their research.

Kathrin Engisch, interim dean of the College of Science and Mathematics, called the lab a “fantastic opportunity” for the entire university.

“It’s wonderful for the number of students who are going to be able to see something like this,” Engisch said. “We have never had anything before like this. It sets us apart from most of the universities around us. We’re proud of that.”

Submitted photos Psychology student Jackie Ewald prepares to view images during an experiment in the new cognitive neuroscience lab.×324.jpgSubmitted photos Psychology student Jackie Ewald prepares to view images during an experiment in the new cognitive neuroscience lab.

Story courtesy of Jim Hannah of Wright State University.

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