Ordinary Objects Caveat: perceptual experiences are directly of ordinary mind-independent objects in the sense that mind-independent objects reliably cause percept properties to hold which intersubjectively count as each other.
Presentation: perceptual experiences are direct perceptual presentations of their objects in the sense that perceptual experiences are perceptions/percepts and that causes of percept properties are tightly constrained by distal object properties. Like reflectance spectra tightly constraining seen colour. — fdrake
According to indirect realists, these are all mental phenomena, no matter what you see or feel. What you see or feel can only be a representation, so it must all be mental phenomena. — Luke
Unless indirect realists are allowed to have both perceptions of a mental phenomena and perceptions not of a mental phenomena?
Where is the evidence for how neural activity interacts with the colors your experience? — Harry Hindu
There is no color in light. Color is in the perceiver, not the physical stimulus. This distinction is critical for understanding neural representations, which must transition from a representation of a physical retinal image to a mental construct for what we see. Here, we dissociated the physical stimulus from the color seen by using an approach that causes changes in color without altering the light stimulus. We found a transition from a neural representation for retinal light stimulation, in early stages of the visual pathway (V1 and V2), to a representation corresponding to the color experienced at higher levels (V4 and VO1).
I can't argue with you about something you have been vague and evasive about. If I don't know what you mean by your use of certain words, then I can't make any coherent argument about anything you've said. — Harry Hindu
The process of perception begins with an object in the real world, known as the distal stimulus or distal object. By means of light, sound, or another physical process, the object stimulates the body's sensory organs. These sensory organs transform the input energy into neural activity—a process called transduction. This raw pattern of neural activity is called the proximal stimulus. These neural signals are then transmitted to the brain and processed. The resulting mental re-creation of the distal stimulus is the percept.
To explain the process of perception, an example could be an ordinary shoe. The shoe itself is the distal stimulus. When light from the shoe enters a person's eye and stimulates the retina, that stimulation is the proximal stimulus. The image of the shoe reconstructed by the brain of the person is the percept. Another example could be a ringing telephone. The ringing of the phone is the distal stimulus. The sound stimulating a person's auditory receptors is the proximal stimulus. The brain's interpretation of this as the "ringing of a telephone" is the percept.
The different kinds of sensation (such as warmth, sound, and taste) are called sensory modalities or stimulus modalities.
I see trees, trees are a mental phenomenon... Wait, I thought you were a realist? — Luke
That doesn't seem to be your position, though, nor that of indirect realists. Indirect realists do not claim that the visual experience is a mental phenomenon or representation of the world outside the body. Instead, they claim that we perceive this mental phenomenon or representation of the world outside the body. — Luke
I'm not sure what you take a direct perception to be. Must a distal object become part of one's body in order to have a direct perception? Who thinks this is a perception? — Luke
In what sense is the mind-independent nature of distal objects and their properties not presented to us via perception? — Luke
You seem to indicate that unless perceptions provide us with complete and incorrigible knowledge about objects, then they don't provide us with any knowledge about objects. — Luke
I'm finding it hard to see how the posts you're making are related, which probably means we have very different presuppositions and ways of thinking about the topic.
So if I'm hearing you right, you believe that knowledge is only of percepts, and thus access to the world is indirect? — fdrake
Right, so for you "access" is something like introspective awareness? — fdrake
Describe what you see that access as, please? — fdrake
Mmm... You don't have "access" to a percept. A percept is identical with either the whole, or a part of, the conceptual-perceptual state of an organism at a given time. That's a numerical/definitional identity, rather than an equivalence. Like the percept is not what perception or experience is of, the percept is an instance of perception. The taste percept of my coffee is the same as how I taste it.
The distinction there is between saying that a percept is an instance of perception vs saying that a percept is what perception acts upon. — fdrake
We have access to percepts. And we have access to the world. It is through this access that we are able to determine when we are hallucinating or dreaming and when we are not.
So, direct realism. Both percepts and world are accessible. — Moliere
I think much of the dispute between direct and indirect realists may revolve around the fact that direct realists limit the meaning of the word "perception" to sensory perceptions that are stimulated by distal objects, whereas indirect realists give the word "perception" a wider meaning that includes non-sensory "perceptions" that lack any external stimulus, such as hallucinations, dreams and imagininings. Neither side has the monopoly on correct usage, but given the question of whether or not I directly perceive some distal object, the former meaning would typically be assumed. — Luke
The same as it means to perceive causes and effects -- one has to start somewhere. We can call that starting point "blotches of color", "cause-and-effect", "the cup", or any other such things. In terms of the epistemological problem of perception we have direct access to some kind of object, be it causes, cups, or color-blotches. — Moliere
I directly perceive the entity. — Moliere
I'd also say there's no "distal object" -- that this is a conceit of indirect realism. — Moliere
The process of perception begins with an object in the real world, known as the distal stimulus or distal object. By means of light, sound, or another physical process, the object stimulates the body's sensory organs. These sensory organs transform the input energy into neural activity—a process called transduction. This raw pattern of neural activity is called the proximal stimulus. These neural signals are then transmitted to the brain and processed. The resulting mental re-creation of the distal stimulus is the percept.
To explain the process of perception, an example could be an ordinary shoe. The shoe itself is the distal stimulus. When light from the shoe enters a person's eye and stimulates the retina, that stimulation is the proximal stimulus. The image of the shoe reconstructed by the brain of the person is the percept. Another example could be a ringing telephone. The ringing of the phone is the distal stimulus. The sound stimulating a person's auditory receptors is the proximal stimulus. The brain's interpretation of this as the "ringing of a telephone" is the percept.
The different kinds of sensation (such as warmth, sound, and taste) are called sensory modalities or stimulus modalities.
Practicality probably. Is that the source of the indirect realist's confidence? — frank
Right. The question is: what is the source of the indirect realist's confidence that the mental phenomena are caused by the dot? — frank
A stimulus produces an effect on the different sensory receptors, which is being transmitted to the sensory cortex, inducing sensation (De Ridder et al., 2011). Further processing of this sensory stimulation by other brain networks such as the default mode, salience network and frontoparietal control network generates an internal representation of the outer and inner world called a percept (De Ridder et al., 2011). Perception can thus be defined as the act of interpreting and organizing a sensory stimulus to produce a meaningful experience of the world and of oneself (De Ridder et al., 2011).
But the direct realist relies on the observations that support belief in electrons (like the light dots on a CRT). The indirect realist has to say that those light dots are creations of the brain, and so may not reflect the facts. — frank
If a color is directly perceived and the wavelength is indirectly perceived, and your mind with all of it's colors and sounds and feelings, are part of reality, then isn't it safe to say that you directly experience part of the world? If so, then doesn't the distinction between indirect vs direct realism become irrelevant? — Harry Hindu
Have scientists been able to explain how a physical, colorless brain causes visual experiences, like visual depth and colors? How are colors come from something colorless?
What role does the observer effect in QM play here? — Harry Hindu
What part of you directly interacts with the world? What is "you" or "I" in this sense? If you define "you" and "I" as your body, then isn't your body directly interacting with objects by holding them and with light by opening your eyes? — Harry Hindu
Indirect realism only makes sense if you define "you" and "I" as homunculus in your head.
The question is about why you have confidence that your observations reflect the facts, when you've concluded that your observations are creations of your brain. — frank
It's that the scientist starts by assuming direct realism, then disproves direct realism. It's an ouroboros. — frank
You don't actually see a distal object when you dream and the schizophrenic does not actually hear a distal object when hallucinating. That what makes them dreams and hallucinations instead of instances of seeing or hearing real objects.
An indirect realist would argue that imaginary friends are directly perceived but real friends are only indirectly perceived. — Luke
The first sentence is a paradox, isn't it? — frank
Indirect realism is the view that what we see is the representation. The alternate is that what we see is the tree, and that we see the tree by constructing a representation of the tree. — Banno
But how does the cognition "see" anything? It is the mental image, the representation of the distal object, which is the "seeing"; the sensory perception. The cognition does not have its own set of sensory organs with which to perceive the mental image. — Luke
When I look at something I can see its qualities: height, width, shape, colours, textures; I don't need to infer those properties. — Janus
One of the conundrums with indirect realism is that it seems to start as direct realism, where the scientist assumes he sees the world exactly as it is, then concludes from what he's observed that he's not seeing the world exactly as it is. How do you deal with that problem? — frank
The experience of pain does not have pain as an object because the experience of pain is identical with the pain. Similarly, if the experience of perceiving is an object of perceiving, then it becomes identical with the perceiving. Just as the pain is identical with the experience of pain, so the visual experience is identical with the experience of seeing.
Both fall prey to the fallacy of ambiguity; there is some ambiguity with the verb "see", for example. In the case of hallucination there is no object of perception. If there was, it wouldn't be a hallucination. So we're confusing the object of perception with perception itself. — NOS4A2
It is true that organisms perceive. It is untrue that brains do. — NOS4A2
Conscious experience, perception, or whatever other activity is impossible if one or the other is missing or deceased or uncoupled. That’s a brute fact we ought to consider, in my opinion. — NOS4A2
The only thing a disembodied brain can do is rot. So brains do not think or experience or perceive. Only bodies do. And the body is, conveniently, the only thing standing between your perceiver and other objects in the world. — NOS4A2
The attempt to dismiss the rest of the body in the act of perception is clearly motivated by something other than scientific inquiry, and it would be interesting to find out what that motivation is. — NOS4A2
When we put a brain on a table it’s impossible to say the brain feels pain or experiences — NOS4A2
therefor it is just untrue to say brains feel pain and experience. — NOS4A2
A stimulus produces an effect on the different sensory receptors, which is being transmitted to the sensory cortex, inducing sensation (De Ridder et al., 2011). Further processing of this sensory stimulation by other brain networks such as the default mode, salience network and frontoparietal control network generates an internal representation of the outer and inner world called a percept (De Ridder et al., 2011). Perception can thus be defined as the act of interpreting and organizing a sensory stimulus to produce a meaningful experience of the world and of oneself (De Ridder et al., 2011).
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Pain is processed by three separable but interacting networks, each encoding a different pain characteristic. The lateral pathway, with as main hub the somatosensory cortex is responsible predominantly for painfulness. The medial pathway, with as main hubs the rdACC and insula are involved in the suffering component, and the descending pain inhibitory pathway is possibly related to the percentage of the time that the pain is present.
perceptible properties of distal objects are directly observed — Janus
What could direct perceptual knowledge be but reliable knowledge of its objects, as opposed to (presumably) indirect (because subject to intermediate distortions) unreliable perceptual appearances? And I'm talking about the vast amount of observational data in botany, zoology, geology, chemistry and so on, not about inferred, unobservable entities and events like electrons and the Big Bang. — Janus