Empiricism learning theory
- 1. An Adventure into the land of... Starring: Empiricism
- 2. The 3 Anchor Points of Empiricism: 1. The only sense of genuine knowledge is sense experience (ie. What you touch, taste, hear, smell, see). 2. Reason is an unreliable and inadequate route to Knowledge unless it is grounded in the solid foundation of sense experience. 3. There is no evidence of innate ideas within the mind that are known apart from experience. What shortcomings exist in viewing perception as such a simple 2-way street?
- 3. The Tabula Rasa The notion of innate ideas (ie. Rationalism), as we have already seen, presupposes that certain knowledge is present from birth. This is different to saying that some types of knowledge are a priori (or true by definition). Empiricists would not want to deny, for example, that "All bachelors are unmarried" is a truth independent of experience. They would, however, deny that such a truth could be innate. For the Empiricists, the mind is a Tabula Rasa (which is Latin for "blank slate"). When we learn or experience things, it is as if the mind is being written on. For the Rationalists, however, the mind is like a computer: the hardware already has some functions (innate ideas) before the software (experiences, specific knowledge) is loaded. knowledg e Through experience we “fill” our heads with knowledge The new Will Farrell full of knowing Hi, kids!
- 4. Question: If innate ideas don't exist, is it possible to learn anything)? Awesome Ramp
- 5. Simple ideas: The Empiricists want to argue that all our ideas come from experience. So, how do we understand the world? Locke thought that our experiences provided us with what he termed simple and complex ideas. Simple ideas might include the redness of a rose, the smell of coffee, the taste of sugar or the sensation of heat. We thereafter use these ideas as the basis for reflection, combining and comparing them to form complex ideas in order to understand the world. Exercise: Pick 3 objects in the room you are in and list five simple ideas about them. Once you have done this, see what complex ideas each of the simple ones might help you form. An example of this can be seen in the way we might get a better understanding of heat. I might burn my hand on a flame, but also on an extremely cold piece of ice. Reflecting on this and other examples I may come to the conclusion that it is not heat which is solely responsible for burns, but difference in temperature (in this case, the difference between my hand and the hot and cold things). Thus, the simple sensations and experiences form the basis for more abstract ideas such as this. Taco Bell nachos The Taco Bell nachos are red... and green...and yellow... and warm...and spicy...some are crispy... some are soft...and salty smelling... Hwhy hwouldn't you eat such hwonderfuly tasty nachos? Hwhat in the hworld is stopping you?
- 6. Primary and Secondary Qualities If we reject, as the Empiricists do, the idea that all our knowledge comes from rational principles, we are left with a major question: How can we tell which of our perceptions are real or true? Locke's answer is to suggest the existence of what he calls primary and secondary qualities. First of all, let us consider an object - a table, for example. Now, Locke's view is that certain qualities of the table are primary qualities of the object (such as the table's shape and size), but others are produced by powers in the object itself, which act on our senses to produce sensations and impressions. Such things as colour, taste and temperature are therefore secondary whilst other primary qualities include number (how many objects there are) and motion (an object's speed or movement). The main thing Locke was trying to do is to limit knowledge to the things that could be said to be primary qualities. So, as far as the table is concerned, such things as its size, shape and weight are fixed and measurable. Its colour, on the other hand, is a matter of subjective opinion. Exercise Of the simple and complex ideas you listed in the previous example, which are primary and which are secondary? Go through your lists and mark P or S next to each one.
- 7. Thought Experiment: 1. Have you found that the perceived color of a piece of clothing changes when you view it by the light of a lightbulb, a neon light, semidarkness, or sunlight? For example, have you ever thought that you were putting on matching socks only to find when you stepped outside that one was black and one was blue? 2. Why doesn't the shape, size, or motion of an object appear to change in different lights? 3. Have you ever disagreed with a friend as to whether the room is too hot or the iced tea too sweet? Why doesn't it make sense to say one of you is right and the other is mistaken? 4. Hold a cut, raw onion under your nose as you bite into an apple. Does the normal taste of the apple appear to be different under these circumstances? These thought experiments illustrate the fact that some properties, such as size, shape, or motion, are constant, whereas other properties, such as color, temperature, or taste, can change from one circumstance to the next.
- 8. Empirical Knowledge Locke considered that knowledge could be of certain types depending on how ideas could be compared. The idea of black, for instance, could be contrasted with that of white; other ideas seem to share a common source, such as light and fire, which quite often go together. These ways of building up information, Locke thought, are the main means by which we turn simple ideas into complex ones. But how certain is such knowledge? Locke considered that there are 3 main types of knowledge: Intuitive. This form of knowledge is the most certain because it seems the most obvious to us and the most difficult to doubt. This would be such things as "I have a body", "Black is not white", but also - according to Locke - "God exists". These are so obvious that we accept them intuitively. Demonstrative. When we begin to put simple ideas together to form complex ones, we are demonstrating something. So, for example, if I compare the heat of the Sun with the heat of a fire, I may demonstrate that they are both made of similar substances. Sensitive. This form of knowledge is the most uncertain because it relies merely on the evidence of the senses. If I look to see how many chairs there are in another room, I am relying on sensitive knowledge, which - as Descartes has shown - can, in some cases, be mistaken. I do believe this is a most capital idea! I particularly rule.
- 9. Thought Experiment: How would Locke give an empirical account of the origin of the following ideas by compounding, relating, and abstracting from the ideas formed through experience: 1. Infinity 2. God 3. Moral goodness or evil 4) Me. Seth Rogen. My awesomeness. How do you know what my awesomeness is?
- 10. Berkley and Idealism Locke's concept of primary and secondary qualities, whilst intended to help us make sense of the limits of knowledge, also had an unintended use. Locke had argued that some of the information which we receive through our senses is subjective and should not be trusted (secondary qualities), whilst other information could be considered objective and constituted reliable knowledge (primary qualities). From Locke's point of view, the thing that possessed these different qualities - the substance - could never really be known in itself. If, for example, we consider once again the example of the table, we can be aware of such things as its colour or texture (secondary qualities) or its shape and size (primary qualities). But we cannot know the thing itself because everything we experience about the table will come under one of these two categories. The Irish philosopher George Berkeley (1685-1783), pointed out that the if all we ever see are secondary or primary qualities, how do we know that substance really exists? In other words, there may be no such thing as matter. This view is called Idealism.
- 11. Conclusion: from Locke's empiricism to the denial of the world of independently existing matter. Berkeley: 1) All we know is what we find in experience 2) We can never know or even make sense of a material world that allegedly lies outside our own, private experiences
- 12. Berkeley's Criticism of Locke Berkeley considered Locke and other philosophers to have opened the door to atheism and scepticism by casting doubt on the senses. In an attempt to defend faith in God and knowledge from such attacks, Berkeley attempted to show that, rather than sensations of objects arising from powers in the object itself (as Locke thought), the experiences were in the perceiver (us). What this means is that the object does not need to possess any powers with which it produces effects on our senses, because the object does not exist apart from our perception of it. This allows Berkeley to deny the sceptical argument that we do not see objects as they really are. Berkeley's View of Reality: My good man George Berkeley said “Esse est percipi,” which means “To be is to be perceived.”
- 13. Arguments for Idealism: The main arguments for Idealism are based on the idea that our perceptions of objects are in us. In other words, when we say that an object is red, its redness is part of our perception of it, not in the object or - as Locke argues - an effect of some power of redness in the object. So what arguments does Berkeley use? First he attacks the idea that secondary qualities can exist in the object: Sensation. When you put your hand in cold water, the temperature feels different depending on the temperature of our hand. If your hand is hot, the water will feel colder; if your hand is cold, the water will feel warmer. The water cannot be hot and cold at the same time. Therefore the perception of temperature must be in the perceiver. Taste. If a taste is pleasurable, such as the sweetness of sugar, how can we say that pleasure exists in the object itself (the sugar)? Therefore, since we cannot separate the taste of sweetness from our pleasure, both must exist in the perceiver and not in the object (the same obviously goes for displeasure). I see a red chicken. But why?
- 14. Next he tries to show that some perceptions are relative, attacking both primary and secondary qualities: Colour. If two people see the same object from different perspectives, one might think it was a different colour to the other. Both colours cannot exist in the object at the same time, so the colour must exist in the perceiver and not in the object. Speed. If I am standing still and I see a train passing, the people on that train are moving at a certain speed, but to each other they appear to be sitting still. If speed exists in the object, how can the people on the train be both moving and at rest? The answer must be that the quality exists in the perceiver. Here Berkeley trues to show that there is no difference between real and apparent qualities: The Master Argument. Berkeley's main argument is meant to show that it is impossible for something to exist without being perceived (or, as he says, esse est percipi, Latin for "To be is to be perceived"). This means that if we cannot imagine what the perception of something must be like, we cannot really say that it exists. Berkeley uses this idea to attack the notion of substance or matter, for if all the qualities that we ascribe to it are either primary or secondary qualities, can we actually say that the substance itself exists?
- 15. According to Berkeley, only a mind can produce ideas (ie. Without the mind there can be no experiences). If our minds did not produce the ideas or experiences we encounter, then God's mind must have created them within us. God directly gives us the world of our experience without the intermediate step of external physical matter. Furthermore, God continuously maintains the world in existence, for even if we are not experiencing a particular object, it still exists within God's mind. *** Berkekey is challenging the traditional notion of what it means for something to “exist.” We can still enjoy the coolness of water and the warmth of fire. The only difference is that we will realize that these experiences are in the form of mental events provided us by God.
- 17. Thought Experiment: Does Berkeley's argument for the Mental Dependency of Ideas seem possible to you? If not, why not? Let's explore Berkeley's line of reasoning further. Pick up a pencil or pen. What are you experiencing? You are probably having visual sensations of a particular color, visual and tactile sensations of an extended length with round or hexagonal sides, and tactile sensations of hardness. Press the point of the pencil or pen into your palm and now you will have the experience of pain associated with the pencil. But where is your pain? Obviously, it is not located out in the external world. Pain is an idea (in Berkeley's sense of the word) or an item within your experience. Yet this mind-dependant idea is part of your experience of the pencil. And Berkeley would say that all the other properties of the pencil have the same status. The sensations of color, shape, and extension in your experience are just that—items within your experience. In describing the properties of the pencil, you did not refer to anything external to your experience.
- 18. 1) Sensory objects (houses, mountains, rivers, and so on) are things present to us in sense experience. 2) What is presented to us in sense experience consists only of our ideas (or sensations). 3) Ideas exist solely in our mind. 4) Therefore, sensible objects exist only in our minds. The Argument for the Mental Dependency of Ideas Conclusion: there is no external physical world that exists apart from us
- 19. And now for our last Empiricist, a most erudite and intellectual dude......although you may disagree with him David Hume
- 20. Hume was an empiricist, for he believed that all information about the world comes through experience. He is radical in his beliefs. The contents of consciousness are what he calls perceptions. A) Perceptions include our original experiences, which he labels impressions. There are two kinds of impressions: 1) Sense Data Impressions (such as visual data, sounds, odors, tastes, and touching 2) Internal Impressions (“internal” impressions are made from the contents of our psychological experiences) Hume defines these impressions as “all our more lively perceptions, when we hear, or see, or feel, or love, or hate, or desire, or will.” B) Perceptions also include what he calls ideas, or the contents of our memories and imagination. Obviously our impressions are more vivid and trustworthy that the copies of them we find in our ideas. Why? Because for an idea to have any legitimacy, it must be traced back to our original impressions or combinations of impressions -I am an empiricist. -I am a capricorn. -I like Woody Allen films. -I like long walks on the beach -Every Thursday I order in Chinese food. -I'm on MySpace. Look for me at Humey@myspace.com
- 21. 180º Hume believed there's a huge gap between reason and the world. He agrees with the rationalists that the logical relations between our ideas are absolutely certain and necessary For example, there must be 180 degrees in the concept of a triangle. BUT this conclusion only establishes a certain relationship between a set of ideas. IT DOES NOT DEMONSTRATE THAT THIS GEOMETRICAL RULE IS TRUE IN THE PHYSICAL WORLD. According to Hume, we can only know this truth from observation. The fact that this concept has always been the case when we've used it to construct buildings does not guarantee that it will work that way tomorrow. Relations of Ideas (ie. Mental ideas) = always true Matters of Fact (ie. “real life”) = not necessarily true We can, according to Hume, deny ANY matter of fact. (ie. The sun will always rise in the morning”) The fact that we feel confident about certain facts about the world is merely the result of our expectations, which are based on past experience. From here, Hume drives empiricism to a radical extreme... Maybe the sun won't rise
- 22. ....From here, Hume drives empiricism to a radical extreme Hume's basic argument: If all we know are the contents of our experience, how can we know anything about what lies outside our experience? (Think about what this means if it's true) - For Hume, all we can know are the personal contents of our individual minds. All we can truly know is what we have experienced. It is impossible to distinguish between the way things appear to us and the way they really are. We cannot have knowledge concerning any mind- independent reality. - We don't know with certainty that the future will be like the past. A limited number of examples cannot prove a necessary truth (ie. 100 times doesn't mean the 101st time will be the same way) He thinks Locke and Berkeley have been inconsistent in working out the implications of their ideas. Also, Hume sees miracles as being unlikely for this exact reason - that they have not been observed often enough. Can this view be criticized? If accepted, Hume's viewpoint makes it pointless to try to prove the existence of God (for example) as a matter of fact. If God is not literally made up of physical matter, and does not have an observable effect on the world, making a statement about God is not a matter of fact. Therefore, a statement about God must be a relation of ideas. In this case if we prove the statement "God exists," it doesn't really tell us anything about the real world; it is just playing with words. Do you agree with Hume's viewpoint? Why or why not?
- 23. Another point made by Hume: How do you know that if you touch a flame right now, you will experience pain? How do you know that if you taste sugar, it will be sweet? You are probably reasoning in this way: (1) In the past, I have found that fire causes pain and sugar is sweet Therefore (2) When I encounter similar examples of fire or sugar, their effects will be similar to the past cases. Statement (1) is certainly true, but does it provide irrefutable evidence for statement (2)? To get from statement (1) to statement (2) you need the following intermediate step: (1a) The future will always be like the past. But how do you know statement (1a) is true? Is it possible to prove the truth of such a statement?
- 24. This is why hume is seen as a so science-friendly. He believed firmly in inductive logic and reasoning. We arrive closer and closer to certainty by observing the repetitive patterns in nature. We do this through experience, not apprehending immaterial rational truths (ie. rationalism).