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11

Yes, this scenario is possible, occurring with certain cases of brain lesions in specific areas of the visual cortex, the fusiform, lingual and posterior parahippocampal gyri. These areas are analogous to what is referred to in primates as V4, or the 4th visual cortex, and are known to be involved (at least partly) in the perception of color (though see ...


10

As @Gray mentioned, the philosophical problem you are interested in is known as the inverted spectrum. Unfortunately, @Gray's claim about no empirical difference is not exactly true. As @ChuckSherrington pointed out, we can have differences in color perception due to brain lesions, but this is cheating in way. We don't have to go this far, we already have ...


10

You may want to read Meaidi et al (2014). They obtained dream reports from congenitally blind, late blind, and matched sighted controls. To quote the abstract, they found: All blind participants had fewer visual dream impressions compared to sighted control participants. In late blind participants, duration of blindness was negatively correlated with ...


9

Usually, for something to be 'real', we want it in some reasonable manner to be objective or (because that is extremely vague) at least very consistent across subjective observers. Unfortunately, colour does not satisfy this. Physical basis. As explained very well by @Stop_forgetting_my_account: Physics does not have colour, it just has a continuous ...


7

It's a conscious choice, so to truly know why, you'd probably have to ask the sign designers themselves...but I can speculate a bit on reasons one might want to choose red. Red is often associated with appetite, impulsivity, and excitement, all of which a merchant might want to encourage in potential customers. Here are some excerpts [emphasis added] from ...


7

This is an experiment testing the Stroop effect, named after John Ridley Stroop who studied it in 1935, and often called a Stroop experiment. It is a classic and well understood experiment and has now become a neuropsychological test for use in clinical settings, usually called the Stroop test.


6

From Stevens & Galanter (1957) Although an extensive investigation of the subjective scale of brightness is still in progress in this laboratory, enough has been learned to show that, for patches of white light viewed in a dark room, subjective brightness is a power function of luminance. Moreover, the exponent is of the order of one-third ...


6

This paper was written in 2010: Perceptual shift in bilingualism: brain potentials reveal plasticity in pre-attentive colour perception. In this paper, we test whether in Greek speakers exposure to a new cultural environment (UK) with contrasting colour terminology from their native language affects early perceptual processing as indexed by an ...


5

It appears that throughout your question you are touching on multiple questions and topics. I will address them in a series of quotes and responses, beginning with the title: Are colors real? They are not physical things. Colors are a form of perception (an abstraction). They exist in your head. In physics the perception of colors is caused by ...


5

Why is red light seen as "warm", although it is still lower in energy than blue? Red and blue light differ in energy density, they are located on opposite sides of the rainbow. Blue light oscillates almost twice as fast as red and has a correspondingly shorter wavelength. And because it swings faster, the particles of blue light are also higher in ...


4

I would point you towards the debate on qualia in cognitive science. It has been argued by some philosophers such as David Chalmers that there are internal qualitative states separate from their physical realization. http://en.wikipedia.org/wiki/Inverted_spectrum With the exception of color-blindness and other differences in visual circuitry such as ...


4

One similar idea is the Blue Diamonds Optical Illusion, is a series of identical things that appear to be a series of darker and darker and darker things, indefinitely. It shows that the Cornsweet illusion can be repeated over and over again. This reminds me of the way the Shepard tone plays the same thing over and over again, but the pitch seems to get ...


4

It's difficult to tell. Dreams are very hard to analyse scientifically since they can't be objectively measured, only self-reported. Dreams are notoriously difficult to recall after waking, so it's almost impossible to tell for certain. There are some self-report studies which do assert that some proportion of dreams are in black and white, but this pattern ...


3

I don't think it is a matter of color/hue. Do you have a source for this hypothesis? If you were able to measure this effect then I would think it happens because of the importance rating a reader develops for a certain group of highlighted words, e.g. "all blue highlighted words are important to me." The user Pete made a good comment in my opinion by ...


3

The three levels of the Stroop test you describe are the following: Congruent stimuli Incongruent stimuli Incongruent stimuli alternated with the Reverse Stroop effect


3

Mainly, because they're too noticeable. You don't really see houses in electric green, pink, or yellow. No one wants to stand out in a crowd or be the sore thumb. Here: http://www.usnews.com/news/articles/2012/10/12/survey-americans-pretty-much-the-whole-world-prefers-boring-colored-cars I'll post more sources when I can.


3

I tried to find a source to back up the claim that 'red' stimulates hunger. I couldn't, and in fact I found a study that suggests the exact opposite: the color red reduces food intake, because it acts like a stop signal (Genschow et al., 2012). This also reminded me of a study by Brian Wansink and colleagues at Cornell, who had study participants consume ...


2

Peter Tse's Infinite Regress Illusion creates the illusion of a stimuli that is continually moving away from a target.


2

This logarithmic increase in order to produce a just noticeable difference between stimuli of two different intensities is in fact a general property or the sensory system. It is known as (Weber-) Fechner's law: Weber's law states that the just-noticeable difference between two stimuli is proportional to the magnitude of the stimuli. Gustav Theodor ...


1

Are you trying to measure something specific to the stimulus you are presenting or is it just a matter of displaying text on a screen where what you are measuring is unrelated to the text per se? For instance, experiments I run depend on the stimulus presentation. We are targeting a certain visual pathway, so for example one stimulus is red/green and high ...


1

Charles Fletcher, one of my professors as an undergraduate, studies reading comprehension. He once mentioned a program called LiveInk, which he researches. This program is intended to improve comprehension for ordinary English, not programming language, but I don't see why it wouldn't work for programming language as well, to some extent at least. It ...


1

To whatever extent colorblindness is a consequence of sensation loss, perceptual loss should necessarily follow. If colorblindness results from diabetes solely due to retinal damage, this means diabetes prevents these two colors from causing different sensory stimulation. If the sensory stimulation is truly the same, it should be perceived the same. A signal ...



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