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TOK sense perception #2

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Miranda Cheng

on 7 November 2012

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Transcript of TOK sense perception #2

TOK :

Perceptions Sight: Physical Characteristics: In what ways does the biological constitution of a living organism determine,influence or limit its sense perception? - Every organism has different limits and advantages because of their biological traits and features
- An organism's perception of the world is directly linked to it's physical capacities and senses Human limitations: Smell and Taste Question: - Sight is one of the most important senses
- Humans eye sight is limited by our eye capacities - We cannot see well in the dark, our irises do not dilate
- We only see certain light waves and parts of the electromagnetic spectrum
- Our field of vision is limited because our eye placement Differences between organisms: - Cats and various other nocturnal creatures have dilating irises which allow them to see in the dark
- Moths and bees detect ultra violet light, and predator animals can see infra red light
- Deer and other prey animals have eyes on the sides of the head for better peripheral vision - Smell is directly linked to taste
- Human noses and tongues are limiting to our sense of smell and taste Human smell: - We cannot distinguish between multiple scents at once
- Our nose can only smell certain molecules and substances
- We must have certain amount of a substance before we can smell and taste it Differences between
organisms - Flies have taste receptors on their feet, so essentially they taste through touch
- Dogs noses are tuned to smell very small odors and substances we cannot smell because they have many more receptors in their noses Differences with perception: - Although dogs have a keen sense of smell, they only see in black and white which greatly alters their perspective of the world - Humans can only hear between 20 Hz to 20 000 Hz, although the upper limit tends to lower with age
- Hearing loss starts at about age 8
- We only hear a fraction of sounds in our world Hear Differences between organisms - Spiders and cockroaches have hairs on their legs that allow them to detect sound
- Cats and dogs can hear quieter sounds, but louder sounds hurt their ears
- Elephants can hear sounds up to 7.5 km away Human hearing - Human hearing is much more limited than we think
- Animals hear much different sounds than us Touch - We feel through nerves, the fingertips have the most collection of nerve endings
- We feel 4 sensations; cold, hot, contact and pain Human Touch - All living organisms respond to touch
- They use it to gauge their environment and react appropriately Differences between organisms - Different animals have more nerve receptors in different parts of their bodies
- For example the mole has 6 times more receptors than the human hand in it's nose
- Manatees can feel objects from far away with it's tactile hairs that cover it's body Differences in use - Animals use their sense of touch for many different uses
- Seals use their whiskers to detect fish swimming up to 180 meters away
- Jewel beetles use the sensors on their feet to detect fire over 50 meters away Question pt 2 If humans are sensitive only to certain ranges of stimuli, what consequences of limitations might this have for the acquisition of knowledge? Are there consequences? - With all the limitations of our senses, there must be consequences on our knowledge, or else we must assume we are all knowing Consequences - The consequences are that there are things we can not discover until we find a way to improve our senses through technology - Multiple realities
- Things we cannot see, they are on different wave lengths or too small to see
- We cannot gain knowledge on things that we cannot perceive - Our senses deceive us many times, which gives us false knowledge
- We must filter the knowledge we receive through our senses knowing they can deceive us - Conclusion: Our perspective on the world and the knowledge we gain from it is limited and influenced by our physical characteristics and the ways we enhance them through technology
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