Journal
HEARING RESEARCH
Volume 257, Issue 1-2, Pages 106-118Publisher
ELSEVIER
DOI: 10.1016/j.heares.2009.08.007
Keywords
Attentional modulation; Frequency-dependent response region; Task-related effects
Funding
- MRC [MC_U135079243, MC_U135097129, MC_U135079235] Funding Source: UKRI
- Medical Research Council [MC_U135097129, MC_U135079243, MC_U135079235] Funding Source: Medline
- Medical Research Council [MC_U135079235, MC_U135079243, MC_U135097129] Funding Source: researchfish
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This study examined the neural basis of auditory selective attention using functional magnetic resonance imaging. The main hypothesis stated that attending to a particular sound frequency would significantly enhance the neural response within those tonotopic regions of the auditory cortex sensitive to that frequency. To test this prediction, low- and high-frequency sound sequences were interleaved to produce two concurrent auditory streams. Six normally hearing participants either performed a task which required them to attend to one or the other stream or listened passively to the sounds while functional images were acquired using a high-resolution (1.5 mm x 1.5 mm x 2.5 mm) sequence. Two statistical comparisons identified the attention-specific and general effects of enhancement. The first controlled for task-related processes, while the second did not. Results demonstrated frequency-specific, attention-specific enhancement in the response to the attended frequency, but no response suppression for the unattended frequency. Instead, a general effect of suppression was found in several posterior sites, possibly related to resting-state processes. Furthermore, there was widespread general enhancement across auditory cortex when performing the task compared to passive listening. This enhancement did include frequency-sensitive regions, but was not restricted to them. In conclusion, our results show partial support for frequency-specific enhancement. (C) 2009 Elsevier B.V. All rights reserved.
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