Ask someone to mark the midpoint of a line with a pen, and most people place the mark a few millimeters too far to the left. The error is small, consistent, and has a name: pseudoneglect. Since neurologists Dawn Bowers and Kenneth Heilman coined the term in 1980, researchers have shown that the same leftward bias influences far more than lines on paper. It affects where we want the light in a painting to come from, which cheek we prefer in a portrait, and which way a subject should “move” to feel right. If you’re choosing a poster for the wall, it’s worth knowing that your brain has already decided on a direction - long before your taste gets a say.
The curious thing is that art history seems to have known about this for five hundred years. When researchers in Bamberg asked participants to judge the direction of light in ten thousand Western paintings, they found a clear convention: from the early Renaissance to 1900, light comes from the upper left. Is this due to the brain, reading direction, or the fact that most artists have been right-handed?
Pseudoneglect: Why Healthy Brains Think the Left Side Is Bigger
The term is a deliberate mirror image of a clinical condition. Patients with damage to the right hemisphere sometimes develop neglect: they ignore the left side of the visual field, eat only from the right half of the plate, and draw clocks with all the numbers crowded to the right. Bowers and Heilman noted that healthy people make a small error in precisely the opposite direction, and therefore called it pseudoneglect - a kind of false, benign neglect of the right side.
The effect is small but unusually stable. A 2000 meta-analysis by Jewell and McCourt compiled 73 studies with a total of 2,119 participants and found a systematic leftward bias, with effect sizes between 0.37 and 0.44. The most common explanation is that the right hemisphere, which controls spatial attention, is slightly dominant and gives the left side of the visual field an extra measure of attention. The left half of an image therefore feels a little heavier and more important than it really is - and that is where an image seems to “begin.”
Quick facts: The term pseudoneglect was coined by Bowers and Heilman in 1980. Jewell and McCourt’s (2000) meta-analysis included 73 studies and 2,119 participants. In 1973, Chris McManus and Nick Humphrey published a survey in Nature of over 1,400 portraits, 60 percent of which showed the left cheek. Carbon and Pastukhov (Frontiers in Psychology, 2018) asked participants to judge the direction of light in 10,000 paintings and found a stable convention of light coming from the upper left from 1420 to 1900.
Ten thousand paintings and light that always comes from the upper left
The claim that Western art is lit from the left is an old one. Ernst Gombrich wrote about it, but the evidence was scant for a long time: a few hundred crucifixes, a handful of Madonna images, a selection from the Louvre. Claus-Christian Carbon and Alexander Pastukhov instead assembled a collection of more than ten thousand paintings from all over Europe, from the Middle Ages to the twentieth century.
The method was designed to uncover bias in the viewer rather than the artist. The participants had little familiarity with art; they were asked to indicate where they thought the light came from, and half the images were shown flipped horizontally. If the subjects were simply repeating what they had learned in school, they would have answered incorrectly for the flipped images. They didn’t. From around 1420, when the early Renaissance began, through 1900, light from the upper left predominated, and during the same period participants were most confident in their judgments. Artists not only became more consistent, but also better at showing the direction.
Why the left side in particular? Gombrich suggested the simplest explanation: most painters were right-handed, and with light coming from the left, the hand doesn’t cast a shadow on what you’re drawing. A competing explanation is pseudoneglect itself - the brain, which already gives the left side extra attention, finds an image “lit” from that side more natural. Probably both mechanisms pull in the same direction, and five centuries of painters gradually turned the habit into a rule.
The left cheek and Rembrandt’s exception
Light isn’t the only thing that leans. When McManus and Humphrey reviewed over 1,400 portraits in 1973, sixty percent showed the left cheek to the viewer, especially clearly in portraits of women. In a follow-up study of Rembrandt, they found that self-portraits and portraits of men more often turn the right cheek outward, while portraits of women turn the left. The left half of the face is controlled by the more emotionally expressive right hemisphere of the brain, and a portrait showing that half is read as warmer.
The French and Israelis saw the same images - and chose opposite sides
If the leftward pull were rooted solely in the brain's anatomy, it should look the same across all cultures. It doesn't, and that's where the story gets interesting for anyone hanging art. In 2000, Sylvie Chokron and Maria De Agostini published a study in which 162 people were shown pairs of images, one a mirror image of the other, and then asked which they liked better. Half were French, reading from left to right. Half were Israelis, reading Hebrew from right to left.
The images were of three kinds: moving objects such as a truck, stationary objects such as a statue, and landscapes such as a beach umbrella. For the first two categories, the groups split evenly. The French preferred objects facing from left to right, in the direction they read, while the Israelis preferred the opposite. But for landscapes, the difference disappeared. Both groups wanted the heavy mass - the cliff, the grove of trees, the house - on the right.
The interpretation is that two systems work simultaneously. Reading habits teach the eye a direction to travel. But beneath that lies something that cannot be trained away: a preference for weight to fall on the right, because the brain already gives the left side extra weight and wants actual mass on the right to balance the image.
In Korea, newspapers changed the direction of their text during the 20th century, from right to left to left to right. Lee and Oh showed in 2015 that illustrations turned along with the text - but photographs did not. Illustrators follow the eye's habits. The camera does not.
"The brain has already chosen a direction - long before taste gets a say."
The flashlight in the virtual gallery: how we want to light a painting
Artists painting light from the left is one thing. The question is whether viewers, unaware of the convention, spontaneously prefer it that way. A research team had participants enter a virtual gallery with a virtual flashlight and position the light where they thought an abstract painting looked best. Again and again, participants placed the lamp above the picture and slightly to the left. A follow-up study with sculptures produced an unexpected result: for three-dimensional works, such as Rodin's The Thinker, the preference partly reversed. Light from the left makes a flat surface feel right, but we want to read a sculpture differently.
Another study found that simply looking at figurative paintings - but not ordinary photographs - strengthened the leftward shift when participants were then asked to bisect lines. Art that engages us turns up asymmetric attention a notch. The image shapes not only how we see it, but how we see the space around it.
What leftward pull means when choosing and hanging a poster
The first practical tip concerns direction in the subject. A landscape with a road, a river, an animal in motion, or a figure looking in a particular direction has a flow. Research by Chokron and De Agostini suggests that Swedish viewers, who read from left to right, generally prefer movement to go to the right. For most people, a nature poster where the horizon or shoreline leads the eye from the left toward a heavier right side will feel balanced. A selection of nature prints at Bozetto is designed just this way, with water or sky on the left and land on the right.
The second tip concerns light. If the subject has a clear light source – a window in an interior, a lamp, the sun behind clouds – its direction matters. Light from the upper left is the convention that five centuries of Western art have taught the eye to expect. Photography is an exception, since the camera has no built-in leftward pull. So when browsing photographic art, it may be worth pausing over pictures where the light comes from the right. They often look a little more unexpected, and that is not always a flaw; sometimes it is exactly what a wall needs.
The third tip is about portraits. Sixty percent of portraits in art history show the left cheek, and research suggests that we read that side as more emotionally present. If you want a portrait or figure to feel warm and open, look for subjects whose faces are turned so that the left cheek faces the viewer. If you want distance and authority instead – think of Rembrandt’s self-portraits – choose the opposite. Among works by famous artists, you can compare both.
The fourth tip concerns arranging several pictures. Since the left side gets extra attention, a gallery wall can benefit from having its largest or darkest piece on the right. A wall with the heaviest piece at the far left often feels as if it is tilting, even when the measurements are identical.
Tip: Try the leftward pull for yourself before deciding where to hang it. Photograph the wall with the pictures arranged on the floor, flip the photo horizontally on your phone, and compare. If the flipped version looks more stable, you probably have the heaviest picture on the wrong side.
Abstract art: when direction is the only subject
In abstract works, there’s no face to turn and no path to follow. Yet they have a direction, and it becomes even more important, if anything, because nothing else draws your attention. A diagonal brushstroke running from the lower left to the upper right is perceived by left-to-right readers as rising and energetic. The same stroke, flipped horizontally, is perceived as falling. A patch of color on the right side of the image feels grounded; one on the left feels as if it’s floating.
The study with the virtual gallery was conducted specifically with abstract art, and that was where left-sided lighting was most preferred. This suggests that the preference lies not in the subject matter but in vision itself. So, if you’re choosing from abstract posters, it’s a good habit to look at the image flipped horizontally before buying. If it clearly feels better one way, at least you’ll know why.
Frequently asked questions about pseudoneglect and direction in art
If you’d like to read more about how the eye actually moves across an image, see our overview of research on eye movements and the first two seconds. If you’ve ever wondered why some compositions just feel right, you can learn more in our article on visual balance and the golden ratio, and the question of culture’s role in how we see is explored further in research on culture, gaze, and Japanese motifs.
Sources: Carbon and Pastukhov’s study of 10,000 paintings is published in Frontiers in Psychology. Chokron and De Agostini’s study on reading habits and aesthetic preference is available via PubMed, and a review of research on writing direction and aesthetics is available in Frontiers in Psychology (2017).
The next time you hold a poster up against the wall and hesitate: flip it around in your mind. If the image feels better mirrored, it’s not your taste that’s uncertain, but your brain weighing in. At Bozetto, you’ll find black-and-white posters, nature scenes, and abstract art in sizes from 21x30 to 100x140 centimeters - each with enough direction to carry a wall, whichever way you choose.