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I know we have sensors in the form of hairs that trigger a nervous impulse to the brain when they are stimulated. But as I understand it, each one can only send that on/off binary signal when they are triggered by a very specific level of sound. Your overall question borders on philosophy and the biology of consciousness which is hardly understood at ...


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The motion after-effect (MAE) is believed to be primarily due to adaptation of direction sensitive cells in the middle temporal area (MT) (Fig. 1.). The directional cells in this area of the cortex are selectively sensitive to motion in one direction. Hence, looking at a waterfall will selectively cause adaptation in those cells tuned to the direction of the ...


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Short answer Our ears are most sensitive to the mid-frequencies. Background There are different ways of assessing sound level. The physical one simply determines the physical sound pressure level (SPL) in which all the frequencies weigh equally. This is referred to as C-weighting and is expressed in dB SPL. Our ears, however, are most sensitive to ...


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To add to the good answer by @AliceD, take a look at some tuning curves for hair cells, the sound receptors in the cochlea (these happen to be fairly low frequencies and a turtle cochlea, though those details aren't all that important): Fettiplace, R. (1987). Electrical tuning of hair cells in the inner ear. Trends in Neurosciences, 10(10), 421-425. The ...


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Short answer No, there are no between-hair cell induced tonotopical gaps in frequency perception. Background Young people are able to hear over a frequency range of about 10 octaves, with a frequency resolution of about 0.3% of an octave. So we would have about 2300 resolvable frequencies. This number is dependent on the sound level, as excitation spreads ...


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The Ishihara Color Test consists of plates containing one number. But that number may consist of two digits (Fig. 1). The plates may also contain one or two wiggly lines that have to be traced. So... Were there slides in the test that had two or more numbers, or was I hallucinating? There might have been two digits in the plate - you were not ...


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This is a more detailed answer about conceptual mechanisms from the same author as AliceD is citing: The first row represents the sensors (for instance photoreceptors) while the second row represents higher order responses (for instance of MT neurons). The latter's response is their resting level response plus the difference of the corresponding channel ...


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The human brain white balances, the eyes do not, but the process is not instantaneous. the easiest way to see this is to make a person wear colored lenses they will soon see colors normally again, but will need to readjust, taking a similar length of time, once the glasses are removed. Your eyes will balance an image back to white , but it takes time, ...


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1) Discerning between solid and granular It is the distribution of the touch receptors in your skin that enables the distinction between solid and granular objects. The ability to recognize two separate points applied simultaneously to the skin from a single point is called two point discrimination. Two point discrimination varies with location on ...


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