What We Know Can Affect How We See

Objects; everything from cars, birds and faces to letters of the alphabet, look significantly different to people familiar with them, a new study suggests.

Using the Arabic alphabet as a frame of reference, Johns Hopkins University researchers studied how experts in the language and novices viewed various letters and found clear evidence that visual processing is influenced by experience. Their findings are forthcoming in the Journal of Experimental Psychology: Human Perception and Performance and are now available online.

“You might assume we have basic vision machinery and that you could detect features of different letters even if you didn’t know the language. But that’s not the case,” said senior author Brenda Rapp, a professor in the university’s Department of Cognitive Sciences. “What you know affects how you see things.”

Researchers, who included lead author Robert W. Wiley, a postdoctoral student in Rapp’s lab, and Colin Wilson, associate professor in the Department of Cognitive Sciences, studied a group of 25 experts in Arabic and 25 people who didn’t know the language. The team showed the participants 2,000 pairs of letters, one pair at a time, and asked them to determine if the letters were the same or different. The answers were measured for speed and accuracy.

Novices were quicker to differentiate letters while experts were more accurate. Yet the more features a letter had, the slower the novices were. Experts were just the opposite — the more horizontals, whorls and curves a letter had, the better they were at distinguishing it.

The team also analyzed the results using hierarchical clustering to determine which letters looked similar to novices and which ones looked alike to experts. Everyone tended to agree on the relationships between certain letters but there were also stark, surprising divergences.

The pairs that tripped up people who weren’t proficient in Arabic tended to look nothing like the ones that confused the pros. Experts were biased by non-visual things they knew about the letters, like the names of the letters, how they are written or the way they sound.

Image shows the arabic alphabet.

This chart groups letters based on how similar they looked to test participants who didn’t know Arabic and to test participants who were experts in the language. Johns Hopkins researchers found the two groups saw the letters quite differently. Credit: Robert W. Wiley/JHU.

“When you become an expert in reading an alphabet, what does that change? Does your visual system see the same thing as a beginner? We say no,” Wiley said. “If you’re an expert, things that look complex to a novice look simple to you.”

The findings should apply not just to letters, but to anything we see.

“What we find should hold true for any sort of object — cars, birds, faces. Expertise matters. It changes how you perceive things,” Wiley said. “Part of being an expert is learning what matters and what doesn’t matter — including visual features. You know what to look for.”

About this psychology research

Funding: This work was supported by National Institutes of Health grant DC012283.

Source: Jill Rosen – Johns Hopkins University
Image Credit: Image is credited to Robert W. Wiley/JHU.
Original Research: Abstract for “The Effects of Alphabet and Expertise on Letter Perception” by hinichiro Watanabe, Wiley, Robert W.; Wilson, Colin; and Rapp, Brenda in Journal of Experimental Psychology. Published online February 25 2016 doi:10.1037/xhp0000213


Abstract

The Effects of Alphabet and Expertise on Letter Perception

Long-standing questions in human perception concern the nature of the visual features that underlie letter recognition and the extent to which the visual processing of letters is affected by differences in alphabets and levels of viewer expertise. We examined these issues in a novel approach using a same–different judgment task on pairs of letters from the Arabic alphabet with 2 participant groups: 1 with no prior exposure to Arabic and 1 with reading proficiency. Hierarchical clustering and linear mixed-effects modeling of reaction times and accuracy provide evidence that both the specific characteristics of the alphabet and observers’ previous experience with it affect how letters are perceived and visually processed. The findings of this research further our understanding of the multiple factors that affect letter perception and support the view of a visual system that dynamically adjusts its weighting of visual features as expert readers come to more efficiently and effectively discriminate the letters of the specific alphabet they are viewing.

“The Effects of Alphabet and Expertise on Letter Perception” by hinichiro Watanabe, Wiley, Robert W.; Wilson, Colin; and Rapp, Brenda in Journal of Experimental Psychology. Published online February 25 2016 doi:10.1037/xhp0000213

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