About 98 percent of the time, the brain chooses the correct word....
LEXICOLOGY
“Language alone protects us from the scariness of things with no names.” – Toni Morrison
The average 20-year-old knows between 27,000 and 52,000 different words. By age 60, that number averages between 35,000 and 56,000. Spoken out loud, most of these words last less than a second. So, with every word the brain has a quick decision to make: which of those thousands of options matches the signal? About 98 percent of the time, the brain chooses the correct word.
But how?
Speech comprehension is different from reading comprehension, but it’s similar to sign language comprehension. Most theories assume that each word we know is represented by a separate processing unit that has just one job – to assess the likelihood of incoming speech matching that particular word. In the context of the brain, the processing unit that represents a word is likely a pattern of firing activity across a group of neurons in the brain’s cortex.
When we hear the beginning of a word, several thousand such units may become active because with just the beginning of a word there are many possible matches. Then, as the word goes on, more and more units register that some vital piece of information is missing and loose activity. Possibly well before the end of the word, just one firing pattern remains active corresponding to one word. This is called the recognition point.
In the process of honing in on one word, the active units suppress the activity of others saving vital milliseconds. Most people cam comprehend up to about eight syllables per second. Yet the goal is not only to recognise the word but also to access its stored meaning. The brain accesses many possible meanings at the same time before the word has been fully identified.
We know this from studies which show that even upon hearing a word fragment like “cap”, listeners will start to register multiple possible meanings like “captain” or “capital” before the full word “capybara” emerges. This suggests that every time we hear a word there’s a brief explosion of meanings in our minds and by the recognition point the brain has settled on one interpretation.
The recognition process moves more rapidly with a sentence that gives us context than in a random string of words. Context also helps guide us towards the intended meaning of words with multiple interpretations like “bat” or “crane” or, in cases of homophones, like “no” or “know”. For multilingual people, the language they are listening to is another cue used to eliminate potential words that don’t match the language context.
So, what about adding completely new words to this system?
Even as adults, we may come across a new word every few days. If every word is represented as a fine-tuned pattern of activity distributed over many neurons, how do we prevent new words from over-writing old ones? One theory is that to avoid this problem new words are initially stored in a part of the brain called the hippocampus, well away from the main store of words in the cortex so they don’t share neurons with other words. Then, over multiple nights of sleep, the new words gradually transfer over and interweave with old ones.
Researchers think this gradual acquisition process helps avoid explosions of meaning as we chat away. At night we rest, but our brains are busy integrating new knowledge into the word network. When we wake up, this process ensures that we are ready for the ever-changing world of language.
Compiled by SZ
An element for how we process language is the number of words there are for us to process. If you go on and on for five or 10 minutes trying to argue a point, the person will only remember a very small part of that. Instead, 30 seconds is the optimal amount for us to speak at any given time. And there are certain power words that hold more sway over our decision making process than others.
“You” – or your name is something that’s so easy to be forgotten and yet so important for great communication. A person’s name is to that person the sweetest and most important sound in any language.
“Because” – probably as dangerous as it is useful, it creates a causal relationship and even giving weak reasons have been shown to be more persuasive than giving no reason at all.
“Instantly” – If we can trigger something immediately, our brain jumps on it like a shark. “Words like “instant,” “immediately,” or even “fast” are triggers for flipping the switch on that mid-brain activity.
