Endogenous auditory frequency-based attention modulates electroencephalogram-based measures of obligatory sensory activity in humans.
Auditory selective attention is the ability to enhance the processing of a single sound source, while simultaneously suppressing the processing of other competing sound sources. Recent research has addressed a long-running debate by showing that endogenous attention produces effects on obligatory sensory responses to continuous and competing auditory stimuli. However, until now, this result has only been shown under conditions where the competing stimuli differed in both their frequency characteristics and, importantly, their spatial location. Thus, it is unknown whether endogenous selective attention based only on nonspatial features modulates obligatory sensory processing. Here, we investigate this issue using a diotic paradigm, such that competing auditory stimuli differ in frequency, but had no separation in space. We find a significant effect of attention on electroencephalogram-based measures of obligatory sensory processing at several poststimulus latencies. We discuss these results in terms of previous research on feature-based attention and by comparing our findings with the previous work using stimuli that differed both in terms of spatial and frequency-based characteristics.
aTrinity College Institute of Neuroscience bSchool of Engineering cTrinity Centre for Bioengineering dSchool of Medicine, Trinity College Dublin, Dublin 2, Ireland eDepartment of Psychology, Centre for Neuroscience in Education, University of Cambridge, Cambridge, UK.
Caroline M
CM
Sheedy
Alan J
AJ
Power
Richard B
RB
Reilly
Michael J
MJ
Crosse
Gerard M
GM
Loughnane
Edmund C
EC
Lalor
D000161:Acoustic Stimulation; D000328:Adult; D001288:Attention / Q000502:physiology*; D001307:Auditory Perception; D001921:Brain / Q000502:physiology*; D004192:Discrimination, Psychological; D004569:Electroencephalography; D005072:Evoked Potentials, Auditory; D005260:Female; D006801:Humans; D008297:Male; D011571:Psychoacoustics; D013647:Task Performance and Analysis; D013997:Time Factors; D055815:Young Adult