have shown that playing action video games (AVG) can help improve visual acuity. A new study by vision scientists at the 人妻少妇专区 and Vanderbilt University聽found that children with poor vision see vast improvement in their peripheral vision after only eight hours of training via kid-friendly video games. Most surprising to the scientists was the range of visual gains the children made, and that the gains were quickly acquired and stable when tested a year later.
鈥淐hildren who have profound visual deficits often expend a disproportionate amount of effort trying to see straight ahead, and as a consequence they neglect their peripheral vision,鈥� said Duje Tadin, associate professor of at Rochester. 鈥淭his is problematic because visual periphery鈥攚hich plays a critical role in mobility and other key visual functions鈥攊s often less affected by visual impairments.鈥�
鈥淲e know that action video games (AVG) can improve visual perception, so we isolated the AVG components that we thought would have the strongest effect on perception and devised a kid-friendly game that compels players to pay attention to the entire visual field, not just where their vision is most impaired,鈥� said , who is also a professor in the . 鈥淎s a result, we鈥檝e seen up to 50 percent improvement in visual perception tasks.鈥�
Successful AVG players distribute and switch their attention across a wide area, while at the same time they remain vigilant for unexpected moving targets to appear, all while ignoring irrelevant stimuli.
The researchers created a with these specific task characteristics while eliminating other components of AVGs, such as the demand for speeded hand-eye coordination, and any violent or other non-child-friendly material.
Game training
Twenty-four low-vision youths from the Tennessee and Oklahoma Schools for the Blind participated in the training experiment that appears in . Pre-training screening showed that while most children had central visual acuity worse than the 20/200 legal blindness limit, they also underutilized their peripheral vision.
According to the study鈥檚 lead author, Jeffrey Nyquist, founder and CEO of NeuroTrainer, the students鈥� issues with the periphery were in part attentional.
Nyquist and the team hypothesized that training the students to pay more attention to their peripheral visual field could have quick results.
鈥淲e didn鈥檛 improve the kids鈥� hardware鈥攖hese children have profound physical problems with their optics, muscles, and retina, and we can鈥檛 fix that,鈥� said Nyquist. 鈥淏ut we could improve their software by training their brain to reallocate attentional resources to make better use of their periphery vision.鈥�
The students were divided into 3 groups: a control group that played a Tetris-like game; a group that played a kid-friendly commercially-available AVG, Ratchet & Clank; and a group that used the training game devised by the researchers. All games were played on a large projection screen to better involve visual periphery.
The game the researchers developed has a dual-task component. Students tracked multiple moving objects simultaneously while being on the lookout for another object that briefly appears and requires a response from the player.
鈥淭he goal is to pay attention to a number of objects over a large area, and to be prepared to react to unexpected events in the even further periphery,鈥� explained Tadin. 鈥淚t forces the low-vision students to expand their visual field鈥攖o shift their attention to the neglected areas of the visual field.鈥�
After a total of eight hours of training, groups who trained with the commercially-available AVG and the custom dual-task game showed significant visual improvements.
Improvements were seen in a range of visual tasks. The students were able to better perceive moving objects (motion perception) in the far periphery, they were able to better attend to visual crowding, such as identifying a specific letter within a field of other letters, and they were much faster at finding objects in cluttered scenes (visual search), like finding a stapler on a messy desk.
Range and stability of visual improvements
鈥淲e were surprised by the range of improvements, and we were even more surprised when we tested a few of the students a year later and found that the gains they made were stable,鈥� said Nyquist. 鈥淲ithin just a few hours of training, they were able to expand their usable visual field and visual search ability.鈥�
Nyquist notes that when the researchers began their work with the students, it was to assess how they maneuver around their environments. 鈥淏ut we quickly went from assessing to thinking 鈥榤aybe we have something that can train them and improve their real-life abilities,鈥欌�� he said. 鈥淲hen we realized that the students achieved up to 50 percent聽improvement in visual聽tasks, we were blown away.鈥�
The research was supported by the National Eye Institute. Nyquist has since founded a for-profit company, NeuroTrainer, which utilizes the dual-task training component used in this research and has applied it to immersive virtual reality training games for elite athletes.
