Download - Knower(s)
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Knower(s)
Natural Sciences
Language
SensePerception
Emotion
Reason
Mathematics
Human Sciences
History
Arts
Ethics
Ways of Knowing
Areas of Knowledge
Theory of Knowledge Diagram
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Empiricismstarting point for all knowledge is experience
Rationalismstarting point for all knowledge is reason
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Sense Perception and Knowledge
Our senses connect us with the world around us …
… but how connected are we?
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Cosmic RaysX Rays
UV LightInfra Red
RadarTV & Radio
Frequency (Hz)
Visual Window
10 22 1020 1018 1016 1014 1012 1010 108 106 104 102 100
Our senses are limited: Light Waves
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Highest Voice
Frequency (Hz)
Audio Window
10 22 1020 1018 1016 1014 1012 1010 108 106 104 102 100
Lowest Voice
Our senses are limited: Sound Waves
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TaK - Perception
Bloodhound: “A nose with a dog attached”
• 230 million olfactory cells compared to 5 million in humans
• 1000 times better sense of smell than humans
• Have been known to be able to track a scent for over 100 miles
Our senses are limited: Smell
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So perhaps we don’t see, hear, smell, taste and touch everything…
… but what we do sense, we sense accurately – don’t we?
TaK - Perception
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Think about physical sensation (Touch)….• You plunge your hand into a bucket of hot
water – is the pain in your hand, or in your mind?
• You plunge your hand into a bucket of ice cold water – for a moment you aren’t sure if it is hot or cold …
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What is in the mind and what is in the world?
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Sensation which is provided by the world
Interpretation which is provided by the mind
(external stimuli + mental processes)
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Esref Armagan – born blind
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In our everyday life, we are not usually aware of our minds
interpreting the sensations that flood into our senses ....
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Awareness test - Selectivity
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Sensory Perception is selective: What the eye saw….
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Sensory Perception is selective: What the camera saw….
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Donna Williams – author and consultant
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“It’s not what you look at that matters, it’s what you see.”
H.D. Thoreau
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Interpretation: Understanding what we see - Coherence
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Expectation
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Expectation
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What is this?
Organising Principles – the Law of Simplicity
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What is this?
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Interpretation – finding meaning in what we see
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Interpretation
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Imagination, Context,
Expectation andSense Perception
affect the way we interpret sense data
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You are walking down a dark alley ... there are footsteps behind you …
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Context
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The mental construction of reality
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The two tables are exactlythe same length and width
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TaK - Perception
“The eyes see only what the mind is prepared to
comprehend”Bergson
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Take the following and explain how education and training can affect what we perceive:
• A biologist looking down a microscope• A dentist looking at an x-ray• A professional wine taster• A lifeguard• An artist
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“Who you are decides what you see”
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Think about the following and describe how they might be seen through the eyes of the
different people:
1. A child dying in poverty as seen by a doctor, an economist, a social worker, the child’s father
2. A sunset as seen by a religious figure, a physicist, a painter, a farmer
3. A tree as seen by a biologist, a logger, an environmentalist, a carpenter
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Sense Perception is an important source of knowledge but there are reasons for treating it with caution:
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• We may misinterpret what we perceive• We may fail to notice something• We may misremember what we have
perceived• Sensory perception is selective• Our senses have limitations• Experience creates expectations• Subjective factors – interests, moods –
affect sensory perception
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Eye-witness testimony
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Person Swap - Expectation
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Some key points:
• Sense perception consists of Sensation and Interpretation
• If we accept that pain and taste are subjective, we might conclude that color and sound are also subjective
• Senses are an important source of knowledge but rather than passively reflect reality, they actively structure it
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TaK - Perception
Some more key points:
• Sense perception is selective• Sense perception has limitations• Although sense perception cannot give us
certainty, if the evidence of our senses is consistent with what reason and intuition tell us, it can still provide a good foundation for reliable knowledge
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Some safeguards:
• Confirmation by another sense
• Coherence
• Independent testimony
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Perception
LanguageHow does the
way we describe something affect the way we see
it?
ReligionWhat role does
perception play in religious
experience?
EthicsDo good people
see the world differently from bad people?
ArtsTo what extent do the arts help us to see the world with
new eyes?History
Should we trust eyewitness testimony?
Human Sciences
Does observation influence what is
observed?
MathsDoes perception play any role in Mathematics?
Natural Sciences
Do expectations influence
observations?
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Some Knowledge Issues
• What factors affect our ability to gain knowledge through the senses?
• How do our senses hinder us in our attempts to gain knowledge?
• How is sensory perception affected by emotion/reason/faith/language?
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• How do context and culture affect our perceptions?
• When you are told that ‘you should be more objective’ – what does that mean?
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ToK Prescribed Essay Title: 2008
“When should we trust our senses to give us truth?”
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TaK - Perception
Common sense realism: the way we perceive the world mirrors the way the world is
Scientific realism: the world exists as an independent reality but it is different from the way we perceive it
Phenomenalism: it makes no sense to say that the world exists independent of our experience of it. “To be is to be perceived” (Are the chairs in the classroom when you aren’t there?)
See ‘Theory of Knowledge for the IB Diploma’ Richard van der Lagemaat, p 99-101
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Extras
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Finished files are the result of years of scientific study combined with the
experience of years
How many times does the letter ‘f’ appear in this sentence?
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