One of the biggest difficulties in understanding and acceptance of evolutionary biology is the eye. It isn't just detractors who are trying to protect a sectarian viewpoint, it is genuinely curious people, smart people, who don't get it because it isn't easy. Science is difficult and, inside science, evolution is difficult. We've even had prominent biologists here submit the idea that perhaps, given its difficulty, evolution might be better reserved for college students
, the same way quantum mechanics is reserved in physics and surgery is reserved for actual doctors even though high school students learn anatomy.
Researchers are saying that the perception of nude bodies is boosted at an early stage of visual processing.
So it may be an overlap with the culturally forbidden nature of scantily clad or nude figures as the driving force behind its appeal in areas as diverse as sexual arousal, art and advertising. Brain imaging studies have localized areas in the brain which are specialized in detecting human bodies in the environment, but it was unknown whether the brain processes nude and clothed bodies in different ways.
Researchers at the University of Tampere and the Aalto University, Finland, have now shown that the perception of nude bodies is boosted at an early stage of visual processing.
Physical activity is always good for you but a new analysis says it may patients reduce their risk of developing glaucoma. Higher levels of physical exercise appear to have a long-term beneficial impact on low ocular perfusion pressure (OPP), an important risk factor for glaucoma.
The analysis examined the relationship between physical activity and current OPP in 5,650 men and women aged 48-90 who live in the U.K. and were part of initial cohort from 1993-1997.
(Dr.) Greg Homer (real name), a representative of Stroma Medical
, a California equipment company, claims his new "Lumineyes" treatment could be an alternative to colored contact lenses. The treatment uses a laser to remove melanin from the upper layer of the iris, leaving the blue color free to replace it within two to three weeks of the procedure. But the process is irreversible. In brown eyes, melanin is located at the front of their eye. whereas in blue eyes it is concentrated at the back of the iris, resulting in reflection of shorter wavelengths of light.
The authors of a new study in Nature Neuroscience studied mechanisms used by the brain to store information for a short period of time. The cells of several neural circuits store information by maintaining a persistent level of activity; a short-lived stimulus triggers the activity of neurons, and this activity is then maintained for several seconds. The mechanisms of this information storage phenomenon occurs in very many areas of the brain.
Diseases such as retinitis pigmentosa (RP) and age-related macular degeneration (AMD) are the leading causes of incurable blindness in the western world. In these diseases, retinal cells (photoreceptors) begin to die and limit the eye's ability to capture light and transmit information to the brain. Retinal cells, like other cells of the central nervous system, have limited capacity for endogenous regeneration.
Now scientists say they can regenerate large areas of damaged retinas and improve visual function using IPS cells (induced pluripotent stem cells) derived from skin. IPS cells became well-researched, along with ordinary stem cells, due to limitations in the US and Europe regarding use of human embryonic stem cells.
In 1970, Japanese roboticist Masahiro Mori described what he called the "uncanny valley
", which was a graph showing our affinity for a machine to its likeness of humans. As robots look and act more human-like, our fondness for them increases, but when machines reach a point where they look so much like us
that we can barely tell they're different, we feel repulsed instead of affectionate.
A new study of the eyes of fossil animals in Science overturns the conventional wisdom that dinosaurs were active by day while early mammals moved at night. Instead, dinosaurs like velociraptor hunted by night while the big plant-eaters browsed around the clock.
The human brain works incredibly fast but visual impressions are so complex that their processing takes up to several hundred milliseconds before they enter our consciousness.
Researchers say they know why this delay may vary in length; if you already know what you are about to see, you recognize it faster.
When the brain possesses some prior information, such as when it already knows what it is about to see, conscious recognition occurs faster. There has been some debate about whether or not the processes leading up to conscious perception were more rigid and if their timing varied.
Wrestlers are taught to ignore an opponent's eyes and instead watch his waist - nothing much is happening that his waist won't be involved in whereas eyes can be misleading. That means wrestlers are conservatives, according to new research coming out in Attention, Perception&Psychophysics.
Progressives follow eye movements more than conservatives, the authors contend. That means that progressives (also, liberals, if you don't know what the word liberal means) and conservatives quite literally do not see the world in the same way. The researchers measured reaction to 'gaze cues' - the tendency to shift attention based on another person's eye movements. Essentially, they wanted to find out who looked more at what distracted someone else.