Esse estudo teve o objetivo de verificar se a apresentação DICÓTICA (ou espacializada, sistema de áudio em 3D) de duas frases simultâneas facilitaria a compreensão da frase alvo em relação à apresentação diótica (não espacializada). Participaram dessa pesquisa controladores de tráfego aéreo (CsVoo), divididos em dois grupos de acordo com sua experiência profissional (novatos e experientes). Todos os participantes tinham o Português Brasileiro como língua-mãe, mas as duas frases apresentadas a eles pelo protocolo experimental (uma alvo, outra mascaradora) eram em inglês. A espacialização das mensagens beneficiou o reconhecimento da mensagem alvo pelos voluntários. Não houve diferenças significativas entre voluntários com diferentes níveis de conhecimento em inglês, experiência profissional ou sexo. / This study aimed to verify whether the dichotic or spatialized (3D audio system) presentation of two simultaneous sentences in English facilitate the identification of a target information comparing to dihotic (nonspatialized) presentation. The subjects in this study were air traffic controllers having as L1 (mother tongue) Brazilian Portuguese, and were divided into two groups (novice and experienced), according to their period of experience on the job. The spatialization of messages improved recognition of the target message by the volunteers. There were no significant differences between volunteers with different levels of knowledge in English, professional experience or gender.

Esse estudo teve o objetivo de verificar se a apresentação DICÓTICA (ou espacializada, sistema de áudio em 3D) de duas frases simultâneas facilitaria a compreensão da frase alvo em relação à apresentação diótica (não espacializada). Participaram dessa pesquisa controladores de tráfego aéreo (CsVoo), divididos em dois grupos de acordo com sua experiência profissional (novatos e experientes). Todos os participantes tinham o Português Brasileiro como língua-mãe, mas as duas frases apresentadas a eles pelo protocolo experimental (uma alvo, outra mascaradora) eram em inglês. A espacialização das mensagens beneficiou o reconhecimento da mensagem alvo pelos voluntários. Não houve diferenças significativas entre voluntários com diferentes níveis de conhecimento em inglês, experiência profissional ou sexo. / This study aimed to verify whether the dichotic or spatialized (3D audio system) presentation of two simultaneous sentences in English facilitate the identification of a target information comparing to dihotic (nonspatialized) presentation. The subjects in this study were air traffic controllers having as L1 (mother tongue) Brazilian Portuguese, and were divided into two groups (novice and experienced), according to their period of experience on the job. The spatialization of messages improved recognition of the target message by the volunteers. There were no significant differences between volunteers with different levels of knowledge in English, professional experience or gender.

Le vieillissement dit "naturel", affecte physiologiquement les structures auditives périphériques; il en va de même du collicule supérieur (CS) lors du traitement des signaux auditifs et visuels. Chez le rat âgé, la sensibilité auditive périphérique diminue et l’extraction des attributs des signaux auditifs est modifiée, et ce, dès les noyaux cochléaires (premiers relais centraux de la voie auditive ascendante). De plus, les propriétés spectrales, temporelles et directionnelles des neurones auditifs du CS sont altérées lors du vieillissement. Ceci se manifeste aussi au niveau de l’organisation topographique de la sensibilité à la direction qui est abolie au sein des couches profondes du CS. Dans la même optique, l’extraction des attributs des fréquences spatiales concentriques mobiles (en présence ou en absence d’objet sonore modulé en amplitude) est altérée aussi au niveau des neurones audiovisuels du CS lors du vieillissement. En effet, au niveau spatial, chez l’animal âgé, la présence de déficits visuels est particulièrement marquée par une diminution de la sensibilité aux stimuli visuels et audiovisuels mobiles et rapides lors du déplacement de l’organisme dans son environnement. Compte tenu de l’ampleur des changements qui s’installent avec le vieillissement au niveau des structures périphériques et centrales, inévitablement, les mécanismes nerveux de la plasticité audiovisuelle de bas niveau, i.e. au niveau des neurones du CS, sont perturbés. En outre, chez l’animal âgé, le gain audiovisuel induit par l’activité des neurones du CS ne produit pas d’amélioration notable par rapport à la modalité unisensorielle. Dans l’ensemble, ces résultats montrent que le vieillissement perturbe l’activité neuronale du CS permettant de détecter les informations sensorielles pertinentes dans un environnement audiovisuel complexe. / Age-related physiological changes affect the peripheral auditory structures; this also applies to the superior colliculus (SC) auditory and visual processes. In aged rats, the peripheral hearing sensitivity decreases and at more central regions, particularly the first central node, in the ascending auditory projections, auditory processing of sounds is altered. Furthermore, at the level of the SC, spectral, temporal and directional properties of auditory neurons are also altered during aging. In addition, no systematic directional spatial arrangement is encountered among the neurons of aged rats, implying that the topographical organization of the auditory directional map is abolished in the deep layers of the SC. Moreover, in a condition where SC visual neurons are stimulated with looming concentric sinusoidal gratings (in the presence or in the absence of modulated audio signals), visual deficits in aged animals are particularly marked by a decrease in sensitivity to fast moving visual and audiovisual stimuli during self-motion. Given the links of age-related changes in the peripheral and in the central structures, inevitably, the mechanisms underlying the neuronal audiovisual plasticity, in the low-level (SC), are somehow disrupted. Specifically, in aged animals, the presence of the auditory stimulus when coupled with the visual signal did not enhance the response activity of the visual neurons. This seems to suggest that the mechanism that may serve to amplify the visual signal under weak or ambiguous and noisy conditions thus improving greater behavioral relevance of detecting rapidly approaching visual and audiovisual moving objects during self-motion is altered with aging. Overall, these results show that aging disrupts the SC neuronal activity that enables detection of relevant sensory information in a complex audiovisual environment.