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Attentional modulation in the detection of irrelevant deviance: a simultaneous ERP/fMRI study
M Sabri1, E Liebenthal, E J Waldron
1Department of Neurology, Medical College of Wisconsin, Milwaukee, WI 53226, USA. msabri@mcw.edu
Journal of Cognitive Neuroscience
|June 14, 2006
Summary
Task difficulty modulates auditory deviance detection by influencing attention. Increased task difficulty enhanced attention to deviant sounds, engaging specific brain regions like the right superior temporal gyrus (STG) for involuntary attention shifts.
Area of Science:
- Neuroscience
- Auditory Perception
- Cognitive Psychology
Background:
- Neural mechanisms of attentional modulation in auditory deviance detection are poorly understood.
- Deviance detection involves identifying infrequent, unexpected stimuli within a repetitive sequence.
- Attentional states can influence how the brain processes auditory information.
Purpose of the Study:
- To investigate how manipulating primary task difficulty affects the detection of task-irrelevant deviant auditory tones.
- To explore the neural correlates of attentional modulation during auditory deviance detection using simultaneous fMRI/ERPs.
- To differentiate the brain regions involved in active attention shifting versus passive deviance detection.
Main Methods:
- Simultaneous functional magnetic resonance imaging (fMRI) and event-related potentials (ERPs) were recorded from 21 participants.
- Participants performed a two-alternative forced-choice duration discrimination task with varying difficulty levels.
- Infrequent deviant tones (1,300 Hz) were presented among standard tones (1,000 Hz), with task difficulty manipulated by changing the duration of the long tone.
Main Results:
- Increased task difficulty led to decreased accuracy and increased response time, indicating greater cognitive load.
- Event-related potentials (ERPs) showed increased amplitude for N1 and P3a components in the difficult task, reflecting heightened attention to deviant sounds.
- Mismatch negativity (MMN) response was larger in the easy task, showing susceptibility to attentional modulation.
- fMRI revealed activation in the right superior temporal gyrus (STG) and superior temporal sulcus for deviant versus standard tones in the difficult task, associated with involuntary attention shifts.
- Passive deviance detection (MMN) was linked to more dorsal STG activation.
Conclusions:
- Task difficulty significantly modulates auditory deviance detection and attentional resource allocation.
- The ventral STG and superior temporal sulcus are involved in involuntary attention shifts toward task-irrelevant auditory stimuli.
- The dorsal STG region is associated with the neural mismatch detection process between expected and deviant sounds.
- Auditory deviance detection involves a complex interplay between bottom-up stimulus-driven processes and top-down attentional control.
