Hemispheric Specialization for Speech Perception in Four-Year-Old Children from Low and Middle Socio-Economic Classes

Abstract

Four-year-old male and female children from low and middle socio-economic class (SEC) were presented a dichotic syllable task. Both low and middle SEC males evidenced significant right-ear advantages. Neither low nor middle SEC females evidenced a significant right-ear advantage. The similar ear advantage in the low and middle SEC populations replicates a previous study with six-year-olds and suggests that the variations in rearing conditions which occur in low and middle SEC classes does not affect hemispheric lateralization for speech perception.

Dichotic Listening Performance in Normal Children and Adults

“…Although the Lenneberg position predicts a steady increase in degree of lateralization from 4 to 13, the Krashen position suggests a ceiling effect at 5. However, results of studies that have looked at age trends in dichotic listening have been contradictory and suggest that such trends may be affected by sex (24,(25)(26)(27)(28) and socioeconomic status (26,29,(30)(31)(32)(33).…”

Auditory interhemispheric transfer in relation to patterns of partial agenesis and hypoplasia of the corpus callosum in spina bifida meningomyelocele

“…Based on information and the fact that the rostrum and splenium are the last regions of the CC to develop and thus most vulnerable to the effects of SBM, we surmised that the most frequent pattern of CC agenesis would involve both the rostrum and the splenium (Barkovich, 2005). Complete agenesis was not expected.Right handed NC children will show the typical REA for CV trigrams (Caplan & Kinsbourne, 1981; Geffner & Dorman, 1976). Children with SBM will exhibit variable ear effects depending on handedness, the status of the splenium and possibly the body as well as spinal lesion level.A reduced REA or a LEA will occur in children with SBM and non-right handedness.…”

“…Left hemisphere language-dominant individuals generally report more digits or consonant-vowel (CV) syllables presented to the right rather than the left ear (a right ear advantage or REA; Bryden, 1982; Kimura, 1963; Springer, 1986), presumably reflecting the dominance of direct contralateral pathways to the left hemisphere. CV syllables have proved to be useful in DL studies with adults (Gadea et al, 2000; Hugdahl et al, 2001; McKeever et al, 1984) and children (Caplan & Kinsbourne, 1981; Geffner & Dorman, 1976). …”

“…Right handed NC children will show the typical REA for CV trigrams (Caplan & Kinsbourne, 1981; Geffner & Dorman, 1976). Children with SBM will exhibit variable ear effects depending on handedness, the status of the splenium and possibly the body as well as spinal lesion level.…”

Η Επιδραση Των Παραγοντων Του Περιβαλοντος Στη Λειτουργικη Εξειδικευση Των Ημισφαιριων Του Εγκεφαλου. (Νευροψυχολογικη Μελετη)

“…Παρόμοια ήταν και τα αποτελέσματα των Berlin και συν. (1973), που παρατήρη σαν υπεροχή του δεξιού αυτιού στην ηλικία των 5 ετών, καθώς επίσης και οι πάρα τηρήσεις των Geffner και Dorman (1975), που αναφέρουν την ηλικία των 4 ετών.…”