When visual data becomes a dull noise

There was a time when photographs had meaning, and held our attention, embedded something inside our minds. Photographs like The Terror of War taken by Nick Ut in 1972 during the Vietnam War.  But the digital age has changed the way we consume photographs. Every day we are bombarded with visual content, and due to the sheer volume, most of it makes little if any lasting impact.

Eventually, the visual data around us becomes an amalgam of blurriness and noise, limiting the amount of information we gain from it.

The human visual system is extremely adept at processing visual information. It can process something like 70 images per second [1,2], and identify images in as little as 13 milliseconds. But it was never really designed to see the variety of visual data now thrust at it. When we evolved, vision was purely to used to interpret the world directly surrounding us, primarily from a perspective of survival, and the visual data it provided was really quite simple. It was never really designed to look at screens, or read books. There was no real need for Palaeolithic humans to view something as small as text in a book. Over time visual processing systems evolved as human life evolved.

The greatest change in visual perception likely occurred when the first civilizations appeared. Living in communities meant that the scope and type of visual information changed. The world became a busier place, more cluttered from a sensory perspective. People no long had to use their vision as much for hunting and gathering, but adapted to live in a community setting, and an agricultural way of life. There likely was very little change in thousands of years, maybe even until the advent of the Industrial Revolution. Society became much more fast paced, and again our vision had to adapt. Now in addition to the world around us, people were viewing static images called photographs, often of far-flung exotic places. In the ensuing century, visual information would play an increasing role in people’s lives. Then came the 21st century, and the digital age.

The transient nature of digital information has likely changed the way we perceive the visual world around us. There was a time when viewing a photograph may have been more of an ethereal experience. It can still be a magical experience, but few people likely realize this. We are so bombarded with images that they fill every niche of our lives, and many people likely take them for granted. Our visual world has become super-saturated. How many Instagram photographs do we view every day? How many of these really make an impact on our lives? It may be that too much visual information has effectively morphed what we perceive on a daily basis into a dull noise. It’s like living next to a busy rail-line – what seems noisy at first over time gets filtered out. But what are we loosing in the process?

[1] Potter, M., “Meaning in visual search”, Science, 187(4180), pp.965–966 (1975)
[2] Thorpe, S., Fize, D., & Marlot, C., “Speed of processing in the human visual system”, Nature, 381(6582), pp.520–522 (1996)

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