Reduction of ballistocardiogram artifact in the simultaneous acquisition of auditory event-related potentials and functional magnetic resonance images

Ellingson, Michael; Liebenthal, Einat; Spanaki, Marianna V.; Prieto, Thomas; Binder, Jeffrey R.; Ropella, Kristina M.

doi:10.1109/iembs.2002.1134435

Cited by 1 publication

(2 citation statements)

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“…In the first phase of analysis, the ballistocardiogram artifact was removed from the ongoing EEG by using a method previously described by Ellingson et al (2004). This artifact is introduced by motion of closed electrical loops (formed by the scalp electrodes, leads, and skin) in a nonuniform magnetic field and is time-locked to the heartbeat (Schomer et al, 2000).…”

Section: Erp Analysismentioning

confidence: 99%

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Attentional Modulation in the Detection of Irrelevant Deviance: A Simultaneous ERP/fMRI Study

Sabri

Liebenthal

Waldron

et al. 2006

Journal of Cognitive Neuroscience

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Little is known about the neural mechanisms that control attentional modulation of deviance detection in the auditory modality. In this study, we manipulated the difficulty of a primary task to test the relation between task difficulty and the detection of infrequent, task-irrelevant deviant (D) tones (1300 Hz) presented among repetitive standard (S) tones (1000 Hz). Simultaneous functional magnetic resonance imaging (fMRI)/event-related potentials (ERPs) were recorded from 21 subjects performing a two-alternative forced-choice duration discrimination task (short and long tones of equal probability). The duration of the short tone was always 50 msec. The duration of the long tone was 100 msec in the easy task and 60 msec in the difficult task. As expected, response accuracy decreased and response time (RT) increased in the difficult compared with the easy task. Performance was also poorer for D than for S tones, indicating distraction by task-irrelevant frequency information on trials involving D tones. In the difficult task, an amplitude increase was observed in the difference waves for N1 and P3a, ERP components associated with increased attention to deviant sounds. The mismatch negativity (MMN) response, associated with passive deviant detection, was larger in the easy task, demonstrating the susceptibility of this component to attentional manipulations. The fMRI contrast D > S in the difficult task revealed activation on the right superior temporal gyrus (STG) and extending ventrally into the superior temporal sulcus, suggesting this region's involvement in involuntary attention shifting toward unattended, infrequent sounds. Conversely, passive deviance detection, as reflected by the MMN, was associated with more dorsal activation on the STG. These results are consistent with the view that the dorsal STG region is responsive to mismatches between the memory trace of the standard and the incoming deviant sound, whereas the ventral STG region is activated by involuntary shifts of attention to task-irrelevant auditory features.

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Section: Erp Analysismentioning

confidence: 99%

“…Vertical eye movements were monitored with bipolar recordings between sites above and below the left eye. Electrocardiographic activity (ECG) was recorded to obtain timing information for ballistocardiogram artifact (BA) reduction (Ellingson et al, 2004). Interelectrode resistance was kept below 5 kΩ.…”

Section: Erp Data Acquisitionmentioning

confidence: 99%