While it can be a natural occurrence, affecting about 20 percent of people, it can also signal a nerve problem or infection. AnisocoriaĪnisocoria is a condition in which one pupil is wider than other. In some cases, one pupil may be bigger and the other smaller (asymmetrical). One symptom is bigger-than-normal pupils.
#Pupil dilation meaning free
“If you’re shopping online, they might bias your decision by offering free shipping at the moment you shift your gaze to a particular product.Health conditions, injuries, and diseases ConcussionĪ concussion is a brain injury that results from the brain smacking against the hard skull during a fall, a hit to the head, or a fast impact involving the whole body. The ubiquity of eye-tracking apps for smartphones and other hand-held devices raises the possibility of altering people’s decision-making process remotely. “Maybe good salespeople can spot the exact moment you’re wavering towards a certain choice, and then offer you a discount or change their pitch.” “We think of persuasive people as good talkers, but maybe they’re also observing the decision-making process,” he says. Richardson adds that successful salespeople may have some insight into this, and use it to be more persuasive with clients. We made them change their minds just by controlling when they made the decision.” “We simply waited for their own decision-making processes to unfold and interrupted them at exactly the right point. “We didn’t give them any more information,” says neuroscientist Daniel Richardson of University College London, senior author of study. By tracking the participants’ eye movements, and removing the two answer options immediately after a participant had spent a certain amount of time gazing at one of the two options, the researchers found that they could nudge the participants to provide that particular option as their answer. Researchers asked participants complex moral questions such as “Can murder ever be justified?” and then displayed, on a computer screen, alternative answers (“sometimes justifiable” or “never justifiable”).
One recent study showed – maybe worryingly – that eye-tracking can be exploited to influence the moral decisions we take. Watching eye movements can also be used to nudge people’s decisions. “When people are looking at scenes they have encountered before, their eyes are frequently drawn to information they have already seen, even when they have no conscious memory of it,” says Roger Johansson, a psychologist at Lund University who led the study. These eye movements can occur unconsciously. Perhaps that’s because eye movements help us to recall the spatial relationships between objects in the environment at the time of encoding. This suggests that the more closely the participants’ eye movements during information encoding corresponded with those that occurred during retrieval of the information, the better they were at remembering the objects. Interestingly, though, participants who were told to fix their gaze in the corner of the screen in which objects had appeared earlier performed better than those told to fix their gaze in another corner. The researchers found that those who were allowed to move their eyes spontaneously during recall performed significantly better than those who fixed on the cross. Some participants were allowed to let their eyes roam about freely others were asked to fix their gaze on a cross at the centre of the screen, or the corner where the object had appeared, for example.
#Pupil dilation meaning series
The participants were then told to listen to a series of statements about some of the objects they had seen, such as “The car was facing to the left” and asked to indicate as quickly as possible if each was true or false. They recruited 24 students and asked each one to carefully examine a series of objects displayed to them in one corner of a computer screen.
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