LAFON 64A THE PRIMARY HEARING (road to language) part 24

The
past 23 articles detailed what HEARING and LANGUAGE were,
individually.

But
what makes the link between the HEARING and the LANGUAGE?

According
to Prof. J.C. LAFON, several functions are required to make the
transition from hearing to language:

1)
The ACOUSTIC FUNCTION.

2)
The INTEGRATIVE FUNCTION.

3)
The LANGUAGE FUNCTION.

4)
Other functions that are part of the INTEGRATIVE FUNCTION.

5)
The SEQUENTIAL FORMS OF KNOWLEDGE.

“Acoustic
messages received by the cochlea are processed and integrated in the
nervous system, they are compared to previously acquired symbols and
identified as significant elements. This function is complex and
corresponds to both the hearing and the understanding…”(1).

1)
The ACOUSTIC FUNCTION.

“The
acoustic function relies on the combined functioning of the middle
ear and the cochlea; it is part of the scope of physiological
activity studies. The transmitted sounds result in acoustic
vibrations that trigger a complex motion of the basilar membrane
based on the cochlear resonance, that we call the “cochlea-dependent
motion”. Impairment of the basilar membrane’s motion is a cause
of deafness clinically identified by a rise in the sounds perception
threshold.”(2)

The
scope of the acoustic function ends at the organ of Corti level.

2)
The INTEGRATIVE FUNCTION.

“The
integrative function sets up the link between the cochlea-dependent
motion of the basilar membrane and the language. It consists in two
main activities: the first one, of neuro-physiological nature,
concerns the auditory pathways and centres ; it can be studied by
electrophysiology. The second activity, of psycho-physiological
nature, relies on memory circuits and thus, on multiple synaptic
associations; it is based on psychological capacities. It can be
studied, on the one hand by physiological measurements, and on the
other hand, by psychological observations. It is when facts are
translated into abstract notions, and images into symbols.
Impairment of this function results in auditory agnosia in adults,
and, in children, it causes either an integration impairment or a
delayed integration depending on whether it is due to a dysfunction
of the auditory pathways or due to a multifunction of the memory
circuits; the latter can be improved, as they can be partially
compensated.” (2)

The
three other functions will be discussed in the next two articles.

JYM

(1)
Professor J.C. LAFON « message et phonétique » («
message and phonetics ») pp. 67-68

(2)
Professor J.C. LAFON « message et phonétique » («
message and phonetics ») page 68.

(3)
Professor J.C. LAFON « message et phonétique » («
message and phonetics ») pp. 68-69

Jean-Yves MICHEL

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