Auditory processing and high frequency audiometry in students of São Paulo

Abstracts

TEMA: processamento auditivo e sensibilidade auditiva para altas freqüências. OBJETIVO: caracterizar os processos de localização, ordenação temporal, padrões auditivos e detecção de tons de altas freqüências, procurando relações entre elas. MÉTODO: 32 ouvintes, paulistanos, escolares (quarta série), submetidos à avaliação simplificada do processamento auditivo, teste de padrão de duração, audiometria de alta freqüência. RESULTADOS: três (9,4%) indivíduos mostraram transtorno do processamento auditivo (TPA), e em um coexistiu o rebaixamento auditivo em altas freqüências. CONCLUSÃO: TPA associado à perda da sensibilidade auditiva em altas freqüências deve ser esclarecido em novas pesquisas.

Audição; Doenças Auditivas Centrais; Estudantes

RESEARCH ARTICLES

Auditory processing and high frequency audiometry in students of São Paulo^*

Cristina Silveira RamosI,¹; Liliane Desgualdo Pereira^II

^IFonoaudióloga. Mestre em Distúrbios da Comunicação Humana pela Universidade Federal de São Paulo - Escola Paulista de Medicina (Unifesp - EPM). Aluna do Programa de Pós-Graduação em Distúrbios da Comunicação Humana da Unifesp - EPM

^IIFonoaudióloga. Doutora em Distúrbios da Comunicação Humana pela Unifesp - EPM. Professora Adjunto da Disciplina dos Distúrbios de Audição da Unifesp - EPM

^{Endereço para correspondência}

ABSTRACT

BACKGROUND: auditory processing and auditory sensibility to high frequency sounds.

AIM: to characterize the localization processes, temporal ordering, hearing patterns and detection of high frequency sounds, looking for possible relations between these factors.

METHOD: 32 hearing fourth grade students, born in city of São Paulo, were submitted to: a simplified evaluation of the auditory processing; duration pattern test; high frequency audiometry.

RESULTS: three (9,4%) individuals presented auditory processing disorder (APD) and in one of them there was the coexistence of lower hearing thresholds in high frequency audiometry.

CONCLUSION: APD associated to an auditory sensibility loss in high frequencies should be further investigated.

Key Words: Hearing; Auditory Central Diseases; Students.

Introduction

The central auditory nervous system (CANS) is a complex system of neural pathways that may be affected by several developmental and pathological factors. The central auditory evaluation had its start in the decade of 50 and, since then, several tests were developed aiming at a better understanding of the central auditory system's function and its disorders.

For years, there were controversies regarding the meaning of the term central auditory processing. In 1996, ASHA defined the Auditory Processing Disorder (APD) as the alteration in one, or more, of the necessary mechanisms or processes of the auditory system responsible for the following behavioral phenomena: sound localization and lateralization; auditory discrimination; auditory pattern recognition; temporal aspects of audition, including temporal resolution, temporal masking, temporal integration and temporal time ordering; auditory performance in the presence of competing acoustic signals and auditory performance with degraded acoustic signals.

The auditory processing is related, then, to what we do with what we hear (Katz et al., 1992). Therefore, having normal hearing thresholds is not enough. It is necessary that the acoustic signal is analyzed and interpreted in a meaningful message.

The APD is an specific dysfunction of the auditory process, but it can also be associated to language, memory and attention deficits, among others.

Individuals with peripherical hearing loss will probably have low performance in the auditory processing tests. However, this is not a sine qua non fact. There are people who even presenting peripherical hearing loss (mild to moderate degree) present normal auditory processing.

The majority of studies correlating hearing loss with auditory processing disorders concern the hearing losses in the frequencies from 250 to 8000Hz (Abel et al, 1990; Marotta et al, 2002; Neyenhuis et al, 2004). A few studies correlate hearing loss in high frequencies with auditory processing.

This happens because the high frequencies audiometry, that can be done through air or bone conduction and that evaluates the frequencies from 8000 to 18000Hz, is a relatively recent procedure and very little used in the clinical audiologic practice.

Some studies show that high frequencies are important for the consonantal discrimination and to the speech recognition, and that people with a hearing loss in those frequencies have difficulty to distinguish the signal from the noise (figure-ground), presenting alteration of the understanding in noisy places (Skinner and Miller, 1983).

The aim of this study is to characterize the processes of localization, temporal time ordering, auditory pattern and high frequencies tones detection in school children, searching for possible correlations between them. This study may contribute with the reflection about the use of the simplified auditory processing evaluation in school children as well as about a possible co-existence between increased hearing thresholds and auditory processing disorders.

Method

This research was approved by the Research Ethics Committee of the Federal University of São Paulo (protocol number 514/01). The school and the children's parents authorized the conduction of the research, signing the Informed Consent Term.

Thirty two children, 16 male and 16 female, aged between 9 and 10 years old, regularly enrolled in the 4^th grade of a private school located in the south zone of São Paulo city, were evaluated.

The evaluations were accomplished in three stages in a silent class of the school. The first and third evaluation stages were carried out individually and the second one, in groups of four children, since the evaluation procedure allowed the group evaluation. Each stage lasted approximately 15 minutes.

Nine to ten years old children were chosen and two procedures were completed in order to select the children: the cochleopalpebral reflex test - in which the child should present the reflex; and hearing screening in the frequencies of 500, 1000, 2000 e 4000 Hz, using a Pediatric audiometer PA-2 - in which the child should respond to a 20dB stimuli in all tested frequencies.

Children were submitted individually to the simplified auditory processing evaluation, proposed by Pereira (1993). The following auditory abilities were tested: sound localization in five directions; verbal and non-verbal sequential memory, corresponding to the processes of localization and temporal time ordering.

The sound localization was tested using an instrument called rattle II. Children were asked to remain with their eyes closed during the stimulus presentation and, afterwards, to point to the direction where the sound came from. The following positions were tested: above, in front, behind, right and left sides of the head.

In order to analyze the non-verbal sequential memory, the following instruments were used: rattle, bell, agogo and black-black. Before starting the evaluation, the sounds produced by the four instruments were presented to the child in order for him to be able to identify them. Furthermore, a demonstration was carried out with the child positioned in front of the instruments; he was asked to point the correct order in which the instruments were presented. Then three different sequences of four instruments were presented to the child sitting with his back to the instruments and in the end of the sounds presentation, the child was asked to point them in the order he judged correct.

The verbal sequential memory evaluation was conducted with the syllable "pa", "ta", "ca" and "fa" sorted in three different sequences. To ensure that all children were able to produce these syllables, they were produced isolated and the children were asked to repeat them. Subsequently, the three sequences of four syllables were presented, without visual cues, and the children were requested to reproduce them orally.

The cochleopalpebral reflex test was done using a musical instrument called agogo. It was observed the presence or absence of the reflex during the percussion of the instrument.

Each child's responses were registered in a standard individual protocol.

The analysis criteria used were based on Pereira (1993). Each ability was analyzed isolated using the subsequent criteria:

. Sound localization (SL): normal - 4 to 5 correct responses; altered - 0 to 3 correct responses;

. Non-verbal sequential memory (NVSM): normal - 2 to 3 correct responses; altered - 0 to 1 correct response;

. Verbal sequential memory (VSM): normal - 2 to 3 correct responses; altered - 0 to 1 correct response;

. Cochleopalpebral reflex: normal - present; altered - absent.

The second stage of the evaluation comprised the Sound Duration Pattern of 3 and 4 elements, proposed by Lizarro (1999). To ensure the uniformity of the stimuli presentation, a CD recording of the test was used (with sounds produced by a transversal flute). The sound stimuli produced present a frequency of 4000Hz, varying only the presentation duration. Two different sound stimuli are presented - a short sound (lasting 59 ms) and a long sound (161 ms) - arranged in 10 different sequences of three sounds and 10 of four sounds. This procedure allows the evaluation of the auditory pattern recognition process.

The evaluation was performed in groups of four children each, selected randomly. In order to standardize the applications, the same sound device was used in all of the evaluations; and all chairs were positioned facing the sound blaster, at approximately one meter distantly.

Every child received an answer sheet and was requested to represent the long sound with a long line ( ) and a short sound with a short line ( ). Afterwards, the instructions were given and a demonstration was performed to ensure the children's comprehension. The instructions were for the child to pay attention to the sequence and, only after its presentation, to mark the answer in the sheet in the order that they judged the correct one.

The analysis criteria of the results was proposed by Rezende (2000). Thus, it was considered a normal performance when a child presented 10 correct answers for the 10 items presented in the Sound Duration Pattern test with 3 sounds, and 9 correct answers for the 10 items in the Sound Duration Pattern test with four sounds.

The third stage of the evaluation was the high frequencies audiometry, that tests the hearing thresholds in frequencies from 8000 to 18000Hz (obtained in dBSPL) using the psychoacoustic method of limits. In this procedure, the limit between hearing and not hearing the pure tones is searched. Thus, the intensity level is decreased in steps of 5 dB until the sound is no longer detected by the individual. In this moment, the sound intensity level is increased until the individual refers that is detecting it; this value corresponds to the hearing threshold for the sound frequency tested. The intensity level values vary from zero to 110 dB sound pressure level (P₀re = 20microPascal).

This evaluation was performed individually in a free-field, using the Audiometer Interacoustics AS10HF with ear phones Koos HV-1A/PRO. The child was asked to put the ear phones and listen carefully to the sounds, raising his hand whenever hearing them. The air conduction thresholds for the right and left ears were tested, in the frequencies of 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 and 18 kHz. The data were registered in individual, standard sheets.

After testing all children, the responses obtained in the Simplified Auditory Processing Evaluation (SAPE) and in the Sound Duration Pattern Test of three and four syllables (SDPT3 and 4) were analyzed statistically. Children who presented responses below the expected in the SAPE and SDPT3 and 4 were re-evaluated, once these procedures may be distorted due to the difficulty in controlling the child's attention.

Only the tasks that the child presented difficulties were re-evaluated and, then, all data were analyzed again. The children were divided into two groups:

. Group 1: compose d by children who presented performance within the normal ratings, in the SAPE and in the SDPT3 and 4;

. Group 2: composed by children who presented performance below the normal ratings in at least one of the procedures;

As follows, the data were submitted to statistical study making possible the quantitative and qualitative analysis.

Statistical Methods:

The results were analyzed using the Student's t-Test and the Regression Model with Repeated Measure (or General Linear Model) and the significance level adopted was 0,05 or 5%.

Results

Figure 1 shows the children distribution according to the number of correct responses in the Sound Localization Test; Figure 2 shows the children distribution according to the number of correct responses in the Non-verbal Sequential Memory Test; Figure 3 shows the children distribution according to the number of correct responses in the Verbal Sequential Memory Test; Figure 4 shows the children distribution according to the number of correct responses in the Sound Duration Pattern Test of 3 sounds and Figure 5, the children distribution according to the number of correct responses in the Sound Duration Pattern Test of 4 sounds.

Based on these results, the sample was gathered in two groups: group I comprised by children who presented performance within the normal standards, in the SAPE and in the SDPT3 and 4; and group II: composed by children who presented performance below the normal standards in at least one of the procedures. Table 1 shows the children distribution according to groups I and II.

Table 2 displays the statistical test values calculated to compare the high frequencies audiometry thresholds according the variables ear (right and left) and gender (male and female).

Since there was no statistical difference regarding the variables described above, the individuals of each group were gathered by gender and ear.

Table 3 and figure 6 present the maximum, minimum and average thresholds, the standard deviation, the median, the 1^st and 3^rd quartiles and the percentiles 10 and 90% observed in the high frequencies audiometry for children in group I. Figure 7 demonstrates a second degree curve built for the hearing thresholds of the tested acoustics.

Once group II was composed only by 3 children, the descriptive measures mentioned above couldn't be studied.

This way, in figures 9, 10 and 11 the hearing thresholds obtained in the high frequencies audiometry for each child are compared to the descriptive measures obtained for the hearing thresholds of children from group I.

Discussion

Before discussing the results themselves, we will comment on the inclusion criteria used for the selection of this study's sample.

Ten years old children were chosen to compose the sample since it is known that the auditory abilities develop according to the increase of age (Koay, 1992), and that children tend to reach the adult's performance in auditory processing test when they are around ten or eleven years old (Baran & Musiek, 2001). Furthermore, some studies demonstrate that small children don't have good a performance in the high frequencies hearing evaluations; that the onset of high frequencies hearing loss is around ten years old (Schochat et al., 2000); that with the increase of age, there is an increase of the high frequencies hearing thresholds (Queiroz et al., 1999; Abel et al., 2000; Rosa et al., 2001); and that the best auditory sensitivity, above 14 kHz, was observed in ten years old children (Burén et al., 1992). This way, it is believed that evaluating ten years old children may exclude the possibility of the beginning of the high frequencies auditory sensitivity deterioration process and the immaturity to respond to the test. Nevertheless, the auditory abilities development, in this age, is considered in the final phase of maturation and children are able to respond adequately to the auditory processing tests proposed.

The second inclusion criterion was the presence of cochleopalpebral reflex. Azevedo (1993) suggests that the presence of this reflex is an indication of normal hearing. Initially children were screened for the presence or absence of the cochleopalpebral reflex and afterwards, the normal auditory sensitivity was confirmed by obtaining the minimal response levels using the Pediatric Audiometer AP-2. It shall be stressed that all children presented cochleopalpebral reflex and had normal auditory sensitivity, presenting minimal response levels in 20 dB for all sound frequencies evaluated. This confirms the concordance of these procedures as indicative of good capacity to detect pure tones of frequencies from 500 to 4000Hz.

The auditory processing of information is essential for the language comprehension and for learning, and the identification of the nature of the auditory damage contributes for the intervention direction (Bellis & Ferre, 1999). Moreover, the literature points that there is a relation between speech and language acquisition and development and the performance in the abilities of localization, verbal and non-verbal sequential memory of the auditory processing (Befi & Carvallo, 1998; Schochat (1999); Garcia, 2001; Gil et al., 2002). The Simplified Auditory Processing Evaluation was used in order to observe possible auditory processing alteration in school age children, to observe its interrelations with learning difficulties and to counsel parents and teachers (Sacaloski et al, 2000; Zanchetta et al., 2000).

Concerning the sound localization test (figure 1), 100% of the children presented results according to the expected.

In the non-verbal sequential memory test (figure 2), 100% of the children presented two or more corrected responses, being considered within the normal standards. This data disagrees with another study (Silva et al., 1993) that observed that this test was the one with the greatest number of alterations. In the verbal sequential memory test (figure 3), the percentage of children who presented results according to the expected was 97%.One children, therefore didn't present satisfactory performance in this test.

However, there are other auditory processing abilities that are not assessed in this screening and that contribute for the language learning, such as, for example, the sound pattern identification (Pereira, 2001). The adequate perception of non-verbal sound patterns, of frequency and duration, contribute to the processing of the speech acoustic characteristics. The adequate reception of the acoustic aspects of speech contributes for the adequate understanding in the language acquisition and development phase, since it facilitates the prosody, the rhythm and the speech intonation appreciation (Musiek, 1999). Furthermore, the duration and frequency pattern tests are sensitive to identify auditory processing disorders (Musiek et al., 1990).

In this study, we chose to complement the auditory processing evaluation by adding a sound duration pattern test with 3 and 4 sounds (Lizarro, 1999). This test may be performed in free field and its importance and efficacy had already been demonstrated in other studies (Rezende, 2000; Dibi, 2000; Rezende et al., 2001). For the analysis criterion , we used the values proposed by Rezende (2000).

Regarding the number of correct responses for the duration pattern test with 3 sounds (figure 4), the percentage of performances below the expected was 6,2%. With 4 sounds (figure 5) we observed that 9,4% of the children presented unsatisfactory performance.

Based on these results, the sample was gathered in two groups: group I and group II (table 1). Considering the simplified auditory processing evaluation (localization and auditory sequential memory), only the individual number 17 showed results below the expected in these procedures. We observe that the percentage of children with unsatisfactory performance, which indicates a difficulty of auditory sound processing, raised from 3,1% (individual 17) to 9,4% (individuals 3, 17 and 28) with the use of the duration pattern test with 3 and 4 sounds. This shows the importance of the use of these tests in the auditory processing evaluation, once some children who had presented normal performance in the simplified auditory processing evaluation and would be considered without difficulties, and they manifested these difficulties when submitted to sound pattern tests. Furthermore, after this study, the children who didn't present performance within the expected were pointed by the school director as having academic learning difficulties. Also, these children's parents received a feedback and were guided to perform some tasks at home, aiming at improving some auditory abilities, and to reevaluate the auditory processing of the child in six months.

Skinner & Miler (1983) affirmed that the high frequencies sounds would be necessary for the consonantal discrimination and speech recognition and that, apparently, people with high frequencies hearing losses would have difficulties to detach the signal from the noise and to listen in noisy ambient. The high frequencies audiometry is not a very used exam in the clinical routine and there are only a few studies conducted in Brazil. (Fouquet, 1997; Pedalini et al., 2000). The data obtained in the evaluations were analyzed statistically and descriptive measures were calculated for the hearing thresholds (table 3 and figure 6). The studies of Humes and Col. (1996) and Dibi et al. (1999) show that the performance in the frequency and duration pattern tests is not influenced by the presence of hearing loss in the frequencies from 250 to 500Hz. Therefore, hearing impaired people resulting from barriers in the peripheral hearing system could or could not present good capacity of temporal processing of information.

The statistical analysis correlated the hearing thresholds considering the variables: right and left ears and male and female genders. No significant statistical differences were observed regarding the variable ear. Concerning the variable gender, there was significant difference only in the frequency of 17kHz. Due to these findings, data were grouped by gender and ear. Stelmachowicz et al. (1989) suggest, however, that there are differences between hearing thresholds regarding gender and ear.

As reported by Queiroz et al. (1999), there was a decrease of auditory sensitivity with the increase of the frequency. Kenna et al. (1993) suggest that the hearing thresholds substantially increase from 13 or 14kHz. In this study the hearing thresholds increased from 14kHz, agreeing with the literature.

Based on the obtained data, a second degree curve was built for the sample's hearing thresholds (figure 7), where it is possible to observe the increasing of the thresholds from the frequency of 13kHz. We verified that the high frequencies auditory sensitivity was similar for the frequencies from 8 to 12kHz (around 35dB), progressively getting worse in approximately 5 dB after 13kHz.

The group II data, composed by only three children, couldn't be analyzed statistically. Therefore, the high frequencies audiometry result of each child was compared, separately, to the reference values established for the sample. There were two children whose high frequencies hearing thresholds were very close to the average thresholds of the sample (figures 8 and 9). Nevertheless, all sound frequencies thresholds were within the calculated reference values (percentile 10%, 1º quartile, median, 2º quartile and percentile 90%).

The third child presented higher hearing thresholds than the sample's average thresholds. Furthermore, his hearing thresholds were above the percentile 90% in several frequencies.

These data reveal that there might be a correlation between the auditory processing difficulties and the high frequencies auditory sensitivity. However, it is early to affirm that this relation exists, once the number of children with auditory processing difficulties was very low. We believe that new researches should be carried out in order to clarify the possible association between the Auditory processing Disorder and the increased thresholds in the high frequencies audiometry.

This study allows us to affirm that it is worth to include the recognition of auditory patterns, using the Duration Pattern Test with musical sounds, in the Simplified Auditory Processing Evaluation.

Conclusion

Based on the evaluation of 32 ten years old children enrolled in the 4^th grade of a private school in São Paulo city, we can conclude that:

. 90,6% of the children presented normal processes of sound localization, temporal time ordering and recognition of sound duration pattern;

. The high frequencies auditory sensitivity decreased with the increase of the sound frequency, and was similar in both ears. The thresholds intensity level varied between 25 to 70dBSPL in median values for the sound frequencies from 8 to 18kHz;

. There are inconclusive indications of correlation between increased hearing thresholds and the auditory processing alteration, since only 1/3 of the children who presented auditory processing alteration had increased hearing thresholds for high frequencies in relation to those found in the group of children without auditory processing alterations.

References

Recebido em 15.01.2004.

Revisado em 23.03.2004; 28.09.2004; 18.01.2005; 17.03.2005; 9.05.2005.

Aceito para Publicação em 22.04.2005.

Artigo de Pesquisa

Artigo Submetido a Avaliação por Pares

Conflito de Interesse: não

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Endereço para correspondência:

Cristina Silveira Ramos

R. Caramuru, 295, apto. 42 - Chácara Inglesa

São Paulo - SP - CEP: 04138-001.

*

Trabalho Realizado na Unifesp- EPM

Publication Dates

• Publication in this collection
  20 Mar 2006
• Date of issue
  Aug 2005

History

• Reviewed
  09 May 2005
• Received
  15 Jan 2004
• Accepted
  22 Apr 2005