In my books and blogs I have discussed linguistic neural codes that make the transmission of specified information possible person to person, including between the Holy Spirit and the human cognitive mind through synaptic networks. Alexandre Hyafil and coworkers published an article in eLife in 2015 entitled “Speech Encoding by Coupled Cortical Theta and Gamma Oscillations” that addresses this process.
“Sensory signals are often made of different rhythmic streams organized at multiple timescales, which require to be processed in parallel and recombined to achieve unified perception. Speech constitutes an example of such a physical complexity, in which different rhythms index linguistic representations of different granularities, from phoneme to syllables and words. . . . We show that, in continuous speech, theta oscillations can flexibly track the syllabic rhythm and temporally organize the phoneme-level response of gamma neurons into a code that enables syllable identification. The tracking of slow speech fluctuations by theta oscillations, and its coupling to gamma-spiking activity both appeared as critical features for accurate speech encoding. . . . The auditory cortex . . . produces various ‘waves’ of electrical activity, and these waves also have a characteristic frequency . . . . One type of brain wave, called the theta rhythm, has a frequency of three to eight bursts per second, which is similar to the typical frequency of syllables in speech, and the frequency of another brain wave, the gamma rhythm, is similar to the frequency of phonemes. It has been suggested that these two brain waves may have a central role in our ability to follow speech, a process investigated by these coworkers. . . . Our network is purely bottom-up and does not include high level linguistic processes and representations, which in all likelihood plays an important role in speech perception. . . . top-down predictions play a significant role in guiding speech perception.”
Although the authors do not identify how “top-down predictions” are made that guide speech perception, it is my suggestion that the immaterial cognitive mind plays this role. Not only would the mind generate the waves identified by the authors that encode speech but also function in speech perception. It is exciting to see how neuroscience investigators are getting close to understanding dualist interaction!