May 14, 2013
Humans Unconsciously Detect Grammatical Errors
redOrbit Staff & Wire Reports - Your Universe Online
Neuroscientists at the University of Oregon have captured conclusive evidence that people detect and process grammatical errors with no awareness of doing so.While the theory that the brain works on autopilot when it comes to grammar has been around for some time, hard evidence has been elusive.
In the current study, native-English speaking participants ages 18-30 had their brain activity recorded using electroencephalography, from which researchers focused on a signal known as the Event-Related Potential (ERP).
This non-invasive technique allowed the capture of changes in brain electrical activity during an event. In this case, events were short sentences presented visually, one word at a time.
Participants were then given 280 experimental sentences, including some that were grammatically correct and others containing grammatical errors, such as "We drank Lisa's brandy by the fire in the lobby," or "We drank Lisa's by brandy the fire in the lobby."
A 50 millisecond audio tone was also played at some point in each sentence, either before or after a grammatical faux pas was presented. This auditory distraction also appeared in grammatically correct sentences.
Study leader Laura Batterink said this approach provided a signature of whether awareness was at work during processing of the errors.
"Participants had to respond to the tone as quickly as they could, indicating if its pitch was low, medium or high," said Batterink, a postdoctoral researcher.
"The grammatical violations were fully visible to participants, but because they had to complete this extra task, they were often not consciously aware of the violations. They would read the sentence and have to indicate if it was correct or incorrect. If the tone was played immediately before the grammatical violation, they were more likely to say the sentence was correct even it wasn't."
When tones appeared after grammatical errors, study participants detected 89 percent of the errors. In cases where subjects correctly declared errors in sentences, the researchers found a P600 effect — an ERP response in which the error is recognized and corrected on the fly to make sense of the sentence.
By comparison, participants detected only 51 percent of grammatical errors when the tones appeared before mistakes.
The key to conscious awareness is based on whether or not a person can declare an error, and the tones disrupted participants' ability to do so, she explained.
However, even when the participants did not notice these errors, their brains responded to them, generating an early negative ERP response. These undetected errors also delayed participants' reaction times to the tones.
"Even when you don't pick up on a syntactic error your brain is still picking up on it," Batterink said.
"There is a brain mechanism recognizing it and reacting to it, processing it unconsciously so you understand it properly."
The brain processes syntactic information implicitly, in the absence of awareness, the researchers concluded.
"While other aspects of language, such as semantics and phonology, can also be processed implicitly, the present data represent the first direct evidence that implicit mechanisms also play a role in the processing of syntax, the core computational component of language,” they said.
It may be time to reconsider some teaching strategies, especially how adults are taught a second language, Neville added.
Children often pick up grammar rules implicitly through routine daily interactions with parents or peers, simply hearing and processing new words and their usage before any formal instruction.
Neville likened such learning to "Jabberwocky," the nonsense poem introduced by writer Lewis Carroll in 1871 in "Through the Looking Glass," where Alice discovers a book in an unrecognizable language that turns out to be written inversely and readable in a mirror.
For a second language, "Teach grammatical rules implicitly, without any semantics at all, like with jabberwocky. Get them to listen to jabberwocky, like a child does,” she said.
The study was published in the May 8 issue of the Journal of Neuroscience.