Bottom-up driven involuntary attention modulates auditory signal in noise processing
Autor: | Lothar Lagemann, Christo Pantev, Henning Teismann, Hidehiko Okamoto |
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Rok vydání: | 2010 |
Předmět: |
Masking (art)
Auditory perception Adult Male Speech recognition Perceptual Masking lcsh:RC321-571 Pitch Discrimination Cellular and Molecular Neuroscience Tone (musical instrument) Young Adult Humans Attention Habituation lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry Auditory masking General Neuroscience lcsh:QP351-495 Signal Processing Computer-Assisted Noise lcsh:Neurophysiology and neuropsychology Acoustic Stimulation Auditory Perception Evoked Potentials Auditory Female Psychology Research Article |
Zdroj: | BMC Neuroscience BMC Neuroscience, Vol 11, Iss 1, p 156 (2010) |
ISSN: | 1471-2202 |
Popis: | Background Auditory evoked responses can be modulated by both the sequencing and the signal-to-noise ratio of auditory stimuli. Constant sequencing as well as intense masking sounds basically lead to N1m response amplitude reduction. However, the interaction between these two factors has not been investigated so far. Here, we presented subjects tone stimuli of different frequencies, which were either concatenated in blocks of constant frequency or in blocks of randomly changing frequencies. The tones were presented either in silence or together with broad-band noises of varying levels. Results In silence, tones presented with random sequencing elicited a larger N1m response than tones presented with constant sequencing. With increasing noise level, this difference decreased and even vanished in the condition where noise intensity exceeded the tone intensity by 10 dB. Furthermore, under noisy conditions, the N1m latency was shorter in the constant sequencing condition compared to the random sequencing condition. Conclusions Besides the well-known neural habituation mechanisms, bottom-up driven attention plays an important role during auditory processing in noisy environments. This bottom-up driven attention would allow us to track a certain auditory signal in noisy situations without voluntarily paying attention to the auditory modality. |
Databáze: | OpenAIRE |
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