Where is Visual Beauty?

goldenratiosculptures.png 

In the brain of the beholder? 

A study in which art criticism-challenged subjects (most of us) were asked to view sculptures in which the classic Golden Ratio parameters were tweaked suggests that our perception of visual beauty is partly instinctive and partly learned.  Test subjects showed more activity in the brain’s limbic insular cortex, part of our emotion mediation system, when viewing sculpture that has been deemed classically beautiful over the ages.

As summed up nicely in Wired – “Thankfully, the researchers did not reach too far in their conclusions. The results, they said, merely suggest that beauty is mediated by separate but overlapping processes. One is learned, the other instinctive — and therein lies the power of art to speak across ages, long after its makers and their world have disappeared.”

Perhaps, as people, we share more in common across cultures than we sometimes admit.

Link: Wired

A Biological Clue to Paying Attention

Acetylcholine (ACh) increases the activity of neurons to detect stimuli that would be typically below an attention threshold. As such it enhances visual processing through signal amplification and may represent the biological basis underlying the process that our minds undergo in focusing attention upon something.

“That’s what attention does–it strengthens the signal you’re interested in and that strengthening helps you filter out other things” said Anita Disney of NYU, “Our findings show that acetylcholine has the ability to turn up the volume on visual activity, just like attention does.”

See also here.

Link: ScienceDaily

The Eyes have it

A bad pun indeed, but how do I know where I am? I wake up every morning and look around. I look down and see my arm – I see “me.” I have yet to wake up and find myself somewhere else in the room looking at my body lying on the bed. This fundamental question about the relationship between human consciousness and the physical body has long been the topic of discussion in philosophy, theology, psychology and the popular press, but has been rarely seen within controlled clinical settings with healthy subjects.

Dr. Henrik Ehrsson, University College London Institute of Neurology, devised a recent experimental method that allowed him to induce an out-of-body experience in healthy people under controlled conditions. By setting up separate video displays that feed live images of participants’ backs into each eye he provided the subjects a viewpoint in which they perceived that they were sitting behind their own bodies. Using two plastic rods to simultaneously touch points on both their real bodies and where the perceived bodies were located he was able to induce the test subjects to feel that they were indeed sitting behind their bodies and watching the action.

“This experiment suggests that the first-person visual perspective is critically important for the in-body experience. In other words, we feel that our self is located where the eyes are,” Ehrsson said.

The eyes’ perception “trumped” the actual feel of the plastic rod on the participant’s skin.

To try a simpler version of this yourself:

For a quicker, less powerful jaunt outside your bodily confines, try the double-mirror trick: Position two mirrors facing each other and then lean toward one so that two thirds of your face is reflected in it. Scratch your cheek and stare deep into the hall of mirrors you have created, past your original reflection, past the image of your back, and settle on the third reflection—your own face but slightly obscured. Within seconds, you won’t recognize that reflection as you, says neuroscientist Eric Altschuler of the University of Medicine & Dentistry of New Jersey in Newark, who reported the phenomenon in the April issue of Perception.

Links: Scientific American