Our vision is completely dependant on light. Light rays reflect of objects and these enter our eyes. Our eyes are basically windows for imformation to be passed through them.
The eye focuses this image and transmits it in tiny electrical impulses through optic nerves to the brain. The brain deciphers these messages and we “see” the object.
Thursday, November 8, 2007
Wednesday, November 7, 2007
sense of touch
Sense of touch
Our sense of touch is the ability to feel by the nervous system (receptors) sending messages to your brain and thus reacting accordingly. We use this sense to detect pain, pressure, temperature etc. For example, if pain was inflicted upon you, your muscles would flinch involuntarily to prevent more pain and injury.
Nerves are located everywhere around your body; it is simply that some places have more nerves than other places and therefore being more sensitive. Unlike the other senses, nerves are everywhere and not specific to site (i.e. sight, eyes)
Fingertips would be a good example of concentrated receptors nerves, making it one of the most sensitive body parts in your body. Thus, even without sight, people are able to read through ‘braille’ by recognizing different ‘surfaces’ and associate them with letters in the alphabet.
Our sense of touch is the ability to feel by the nervous system (receptors) sending messages to your brain and thus reacting accordingly. We use this sense to detect pain, pressure, temperature etc. For example, if pain was inflicted upon you, your muscles would flinch involuntarily to prevent more pain and injury.
Nerves are located everywhere around your body; it is simply that some places have more nerves than other places and therefore being more sensitive. Unlike the other senses, nerves are everywhere and not specific to site (i.e. sight, eyes)
Fingertips would be a good example of concentrated receptors nerves, making it one of the most sensitive body parts in your body. Thus, even without sight, people are able to read through ‘braille’ by recognizing different ‘surfaces’ and associate them with letters in the alphabet.
Our Sense of Sight
As I was told not to go into much scientific depth about our senses I will make it short. Basically our ability to see happens as light passes through our eye and is inverted through our lens. The light sensitive cells inside our eyes then picks up the image and transfers it to our brain via our optic nerve. It is then the job of the brain to interpret the data and make our image the "right way up". That said, it is reasonable to question how accurate the world around us is when the final image that we "see" is processed by our brain. Many people are also very
Visual illusions are caused by images that are sometimes misleading and deceptive causing our brains to cause illusions in what we see than what is actually there. Two examples I have chosen below include the Scintillating grid illusion in which the contrast of colours converge to cause the illusion of dots in the intersections.
Visual illusions are caused by images that are sometimes misleading and deceptive causing our brains to cause illusions in what we see than what is actually there. Two examples I have chosen below include the Scintillating grid illusion in which the contrast of colours converge to cause the illusion of dots in the intersections.
The second illusion I have included an optical illusion whereby the two cirlces seem to be rotating when the viewers head is moving forwards and backwards while looking at the black dot.
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