Omega
500+ Head-Fier
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There's a lot of debate about whether or not we can perceive audio information encoded at frquencies higher than our ears can perceive. Without entering that argument per se, I recently ran across an interesting article arguing that we can in fact perceive this information, and thought it was interesting enough to pass on to you all
Oohashi et al. Journal of Neurophysiology (2000) 83(6):3548-3558.
Link to article (may require access persmission)
In brief, the authors addressed the issue of a subject being unable to consciously identify an effect of high-frequency sound by using quantifiable and reproducible measurements of brain activity (EEG=electroencephalography, PET=positron emission tomography, and a comparison of high-frequency sound with full range sound).
"In conclusion, our findings that showed an incrase in alpha-EEG potentials, activation of deep-seated brain structures, a correlation between alpha-EEG and rCBF (ed. tissue activity correlates with rCBF measurement) in the thalamus and a sunjective preference toward the FRS (full range sound), give strong evidence supporting the existence of a previously unrecognized response to high-frequency sound beyond the audible range that might be distinct from more usual auditory phenomena."
Oohashi et al. Journal of Neurophysiology (2000) 83(6):3548-3558.
Link to article (may require access persmission)
In brief, the authors addressed the issue of a subject being unable to consciously identify an effect of high-frequency sound by using quantifiable and reproducible measurements of brain activity (EEG=electroencephalography, PET=positron emission tomography, and a comparison of high-frequency sound with full range sound).
"In conclusion, our findings that showed an incrase in alpha-EEG potentials, activation of deep-seated brain structures, a correlation between alpha-EEG and rCBF (ed. tissue activity correlates with rCBF measurement) in the thalamus and a sunjective preference toward the FRS (full range sound), give strong evidence supporting the existence of a previously unrecognized response to high-frequency sound beyond the audible range that might be distinct from more usual auditory phenomena."