The Relationship of Head and Brainstem Size to Main Parameters of ABR in the Developmental Age and in Adults

Antonelli, A.; Bonfioli, Francesca; Nicolai, Piero; Peretti, Giorgio

doi:10.3109/00016488809119525

Cited by 18 publications

(11 citation statements)

References 5 publications

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“…This striking correspondence of our electrophysiological data and the anatomical data of Sato et al strongly suggests that this difference in anatomical length has not changed the tonotopic mapping but has been compensated by an alteration in the stiffness gradient. Finally, an intergender difference in the cochlear response time may be the additional variable to account for the wave V latency difference between genders that could not be wholly explained by physical variables such as head size and dimensions of neural structures (Patterson et al, 1981;Antonelli, 1988;Elton, 1988;Durrant et al, 1990;Sabo et al, 1992).…”

Section: It May Be Difficult To Understand How Wave I (And Therefore mentioning

confidence: 99%

Gender differences in cochlear response time: An explanation for gender amplitude differences in the unmasked auditory brain-stem response

Don

Ponton

Eggermont

et al. 1993

The Journal of the Acoustical Society of America

132

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Derived narrow-band auditory brain-stem responses (ABRs) in young normal-hearing subjects revealed a significant gender difference in response time between frequency regions of the cochlea. Females showed shorter delays than males between derived bands. This differential has not been previously reported. As in many early studies, the unmasked amplitude of the wave V complex was significantly larger (30%) in females than males. However, differences in amplitudes of the narrow-band responses were too small to account for the differential in the unmasked response. It is hypothesized that the larger amplitude of the unmasked wave V complex in females occurs because of a faster response time across the cochlea leading to better neural synchrony and, therefore, larger amplitudes. Furthermore, results can be explained by assuming that the stiffness gradient in the cochlea is 13% larger in females than in males. If males and females have the same cochlear tonotopic mapping, the female cochlea should be 13% shorter. This prediction is highly consistent with recent anatomical studies of cochlear length and gender. The results of the present study indicated possibly important cochlear mechanisms that influence the main parameters of ABRs. An understanding of these cochlear mechanisms may improve the diagnostic capabilities of ABRs in patients with peripheral hearing loss.

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Section: It May Be Difficult To Understand How Wave I (And Therefore mentioning

confidence: 99%

Gender differences in cochlear response time: An explanation for gender amplitude differences in the unmasked auditory brain-stem response

Don

Ponton

Eggermont

et al. 1993

The Journal of the Acoustical Society of America

132

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“…A previous study has suggested that brain size has an influence on the latency of BAEP waves [14], and the relevant brain feature is thought to be the length of the auditory neural pathway. This finding is supported by documentation of the correlation between BAEP latencies and brain stem length as measured using magnetic resonance imaging views of the human brain stem [1].…”

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confidence: 52%

Brainstem Auditory Evoked Potentials in Japanese Black and Holstein Cattle

Arai

Matsui

2008

The Journal of Veterinary Medical Science

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ABSTRACT. This study was performed to examine normal brainstem auditory evoked potential (BAEP) data for adult Japanese Black cattle and to evaluate whether differences exist in the peak latencies, interpeak latencies (IPL) and waveforms of BAEP between Japanese Black and Holstein cattle. The peaks were detected as major waves I, II, III and V in each group. The threshold of the BAEP waves in the Holstein cattle was 65-75 dB nHL, but the threshold in the Japanese Black cattle was 75-85 dB nHL. The I-III and I-V IPLs were significantly shorter in the Japanese Black compared with the Holstein cattle at an intensity of 105 dB nHL. The present findings suggest that the IPL and wave threshold of BAEP are influenced by bovine breed. KEY WORDS: BAEP, cattle, Holstein, Japanese Black.J. Vet. Med. Sci. 70(10): 1139-1142, 2008 Brainstem auditory evoked potentials (BAEP) are bioelectric waves consisting of a sequence of 4 to 7 peaks in the potential, which can be recorded from scalp electrodes within the first 10 msec after an auditory stimulus [13]. Each electric potential is generated by activation of one of the subcortical components of the acoustic pathway. Measurement of BAEP is useful in objective assessment of auditory function and of the localization of brainstem lesions in humans [3]. In the BAEP of Holstein cattle, vertex-positive peaks have been identified as waves I, II, III and V, while wave IV is usually absent [2,15]. The generator site of wave I of the BAEP is thought to be the eighth nerve, and wave II is possibly generated by the cochlear nucleus [3]. The generator sites of waves III and V are thought to be the superior olivary complex of the obex and the inferior colliculus of the midbrain, respectively [3].The peak and interpeak latencies of BAEP have very good reproducibility. On the other hand, it has been reported that the peak or interpeak latencies of BAEP are influenced by physiological factors such as age, gender, size and breed. In humans, the peak latencies of BAEP are longer in men than in women [14], and there are increases in the peak latencies of BAEP waves with increasing age after childhood [12]. In dogs and horses, it has been reported that the peak or interpeak latencies of BAEP depend on size and breed [9,11]. The purpose of this study was to examine normal BAEP data for adult Japanese Black cattle and to evaluate whether differences existed in peak latencies, interpeak latencies (IPL) and the waveforms of BAEP between Japanese Black cattle and Holstein cattle.Ten adult Japanese Black cows 2 to 12 years of age and 10 adult Holstein cows 2 to 6 years of age were used in the present experiment. Japanese Black cattle were housed at the Hokkaido Animal Research Center and Holstein cattle were housed at the National Institute of Animal Health. The animals were given a commercial cattle concentrate, hay and free access to water; silage was also given to Japanese Black cattle. All animals were healthy and appeared to have normal audition based on their responses to environmental sound stimuli...

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“…The results showed that head circumference in the preterm SGA infants (32.9 ± 2.2) was significantly smaller than that in the AGA term infants (35.0 ± 1.4) (p < 0.01, Table 1). It is known that the size of the head affects the measurement of BAER variables, particularly during early development (17)(18)(19). To find any relationship between BAER findings and head size in the preterm SGA infants and to examine whether any BAER abnormalities in the preterm SGA infants are related to their smaller head size, the correlation between the measurements of BAER variables and head circumference was analysed.…”

Section: Correlation Between Baer Results and Head Circumferencementioning

confidence: 99%

“…the distance between the recording electrodes and the location of the generators of the evoked potentials. In the adult the I-V and III-V intervals correlate positively with head circumference; the smaller the head the shorter the I-V and III-V intervals, because of the shorter neural pathway (17)(18)(19). In the infant the relationship between BAER intervals and head circumference is complex and changes as a function of age, which is related to myelination and synaptic development of the brainstem during maturation (17,19).…”

Section: Baer Abnormalities Following Iugr Are Associated With Small mentioning

confidence: 99%

Brainstem auditory-evoked responses to different rates of clicks in small-for-gestational age preterm infants at term

ZD¹,

DM²,

Wang³

et al. 2004

Acta Paediatrica

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The Relationship of Head and Brainstem Size to Main Parameters of ABR in the Developmental Age and in Adults

Cited by 18 publications

References 5 publications

Gender differences in cochlear response time: An explanation for gender amplitude differences in the unmasked auditory brain-stem response

Gender differences in cochlear response time: An explanation for gender amplitude differences in the unmasked auditory brain-stem response

Brainstem Auditory Evoked Potentials in Japanese Black and Holstein Cattle

Brainstem auditory-evoked responses to different rates of clicks in small-for-gestational age preterm infants at term

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