RESUMO
The effect of blindness on sound source identification was studied. Four groups of normally-hearing adults, two sighted and two blind, participated. Subjects were tested using arrays of four and eight loudspeakers, surrounding them in the horizontal plane. One sighted group was tested in quiet. The other groups were tested in continuous 60-dB SPL white noise. Three 75-dB SPL 300-ms stimuli were localized: one-third octave noise bands, centered at 0.5 and 4 kHz, and broadband noise. Broadband noise was easiest to localize (both binaural and spectral cues available), and the 0.5-kHz noise band was the most difficult (primarily interaural temporal difference cue available). Subjects with late-onset blindness achieved significantly higher scores than the early blind and blindfolded sighted subjects. The percentage correct decreased with an increase in the number of speakers, but background noise had no effect. The results attest to the benefit of early visual experience for spatial hearing in adulthood, and demonstrate the negative impact of sudden loss of sight.
Assuntos
Percepção Auditiva/fisiologia , Cegueira , Localização de Som , Percepção Espacial , Adulto , Sinais (Psicologia) , Humanos , Pessoa de Meia-IdadeRESUMO
O Linfoma de Burkitt é a neoplasia näo-Hodgkin mais comum na infância. Incide em cerca de 7:1.000.000 criança e afeta em especial meninos, maiores de 5 anos, com pico entre 7 e 11 anos. A forma de apresentaçäo mais comum é abdominal, com frequente envolvimento do sistema nervoso e medula óssea. O diagnóstico clínico-laboratorial é confirmado por exames de imageamento tumoral, em especial a tomografia computadorizada. Os autores apresentam o caso de uma criança de 2 anos de idade com Linfoma de Burkitt gastrointestinal, tratada com cirurgia e quimioterapia e com seguimento clínico satisfatório em 6 meses de acompanhamento
