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P083 Method for continuous multichannel measurement of impedance at the auricular sites innervated by various cranial nerves
Abstracts / Clinical Neurophysiology 128 (2017) e1–e163
Objectives: We investigated whether convergent and divergent thinking can be modulated by cerebellar transcranial direct current stimulation (tDCS) (Ferrucci et al., 2014). Materials & methods: 15 healthy subjects (aged 25–30; 9 female and 6 male) were recruited. We delivered anodal cerebellar tDCS (2 mA, 20 min) (n = 8) and sham tDCS (n = 7). In each session, Remote Associates Task (RAT) was administered before (baseline T0) and after tDCS (T1) while Divergent Thinking Test (DTT) was administered during stimulation. Non parametric test was used to analize the data. Results: Anodal cerebellar tDCS and sham tDCS failed to induce significant changes in all tasks ([mean ± SEM] Anodal vs Sham: RAT 0.75 ± 0.64 vs 0.71 ± 0.86, p = 0.9; DDT 78.19 ± 2.13 vs 80.33 ± 5.9, p = 0.53). Conclusion: We did not observe creativity modulation with cerebellar tDCS. Because previous studies reported that hemispheric
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tDCS modulated creativity, we can conclude that the cerebellum in not involved in creativity at least in the task we tested. References Ferrucci R, Priori A. Neuroimage 2014;15(85). 3:918-23. Guilford JP. Am Psychol 1950;5:444–54. Jung et al. Front Hum Neurosci 2013;7:330. doi:10.1016/j.clinph.2016.10.207
P083 Method for continuous multichannel measurement of impedance at the auricular sites innervated by various cranial nerves— T. Usichenko a,b,*, D. Gogola c, T. Dermek c, M. Teplan a,b,c (a McMaster University, Anesthesia, Hamilton, Canada,
Figure 1: Sample of the impedance monitoring using invasive (I) and non-invasive (NI) electrodes at the auricular sites and forearm of healthy male volunteer during resting period.
Figure 2: Sample of the impedance monitoring using invasive electrodes at the auricular sites of healthy male volunteer during heat pain stimulation (vertical line).
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Abstracts / Clinical Neurophysiology 128 (2017) e1–e163
b University Medicine of Greifswald, Anesthesiology, Greifswald, Germany, c Slovak Academy of Sciences, Institute of Measurement Science, Bratislava, Slovakia) ⇑
Corresponding author.
Question: External auricule receives afferent supply via vagal, trigeminal and cervical nerves (Peuker and Filler, 2002). Reduced impedance of the auricular sites innervated by vagal and trigeminal nerves is associated with pain and malfunction of internal organs (Oleson et al., 1980; Saku et al., 1993). The aim was to develop the robust method for continuous measurement of skin impedance at the sites of auricle, supplied by various cranial nerves. Methods: Multichannel device for continuous impedance measurement, based on Atmel ATmega16 microprocessor with 1 kHz of probing alternating current frequency was controlled using Matlab environment via USB port. The device measures voltage difference between the reference electrode (right forearm) and the sites of interest (innervation areas of cranial nerves) and transforms the voltage values into impedance using the calibration measurements of known resistances. Surface ECG and stainless steel needle electrodes were used at the sites of interest on the right auricles of healthy volunteers. Impedance monitoring was performed at rest and under the heat pain stimuli, delivered via CHEPS thermode (MEDOC analyser, Israel).
Results: Reproducible stable data with the voltage of 1 V, current values of 100 lA and impedance around 10 kX were acquired (Fig. 1), whereas invasive measurement yielded less variable data than non- invasive procedure. Heat pain stimulation led to differential reduction of the impedance in the sites of cranial nerve innervation (Fig. 2), whereas the decreased impedance recovered to the baseline values (Fig. 2). Conclusions: The multichannel continuous measurement of impedance at the external auricle was feasible. Further investigations are warranted to clarify the differential impedance response from the auricular sites in healthy subjects under stress challenge and patients. References Oleson et al. Pain eson et;8:217–29. Peuker, Filler. Clin Anatomy 2002;15:35–7. Saku et al. Clin Cardiol 1993;16:415–9. doi:10.1016/j.clinph.2016.10.208
P084 Electric field distribution in the lumbar spinal cord during transspinal magnetic stimulation—S.R. Fernandes a,b,*, R. Salvador a, C. Wenger a, M. de Carvalho b, P.C. Miranda a (a Institute of
Figure 1: E-field magnitude distribution in the SC for the PA configuration: left - WM total volume; centre and right - WM and GM lumbo-sacral slices 5 m.
Objectives: We investigated whether convergent and divergent thinking can be modulated by cerebellar transcranial direct current stimulation (tDCS) (Ferrucci et al., 2014). Materials & methods: 15 healthy subjects (aged 25–30; 9 female and 6 male) were recruited. We delivered anodal cerebellar tDCS (2 mA, 20 min) (n = 8) and sham tDCS (n = 7). In each session, Remote Associates Task (RAT) was administered before (baseline T0) and after tDCS (T1) while Divergent Thinking Test (DTT) was administered during stimulation. Non parametric test was used to analize the data. Results: Anodal cerebellar tDCS and sham tDCS failed to induce significant changes in all tasks ([mean ± SEM] Anodal vs Sham: RAT 0.75 ± 0.64 vs 0.71 ± 0.86, p = 0.9; DDT 78.19 ± 2.13 vs 80.33 ± 5.9, p = 0.53). Conclusion: We did not observe creativity modulation with cerebellar tDCS. Because previous studies reported that hemispheric
e47
tDCS modulated creativity, we can conclude that the cerebellum in not involved in creativity at least in the task we tested. References Ferrucci R, Priori A. Neuroimage 2014;15(85). 3:918-23. Guilford JP. Am Psychol 1950;5:444–54. Jung et al. Front Hum Neurosci 2013;7:330. doi:10.1016/j.clinph.2016.10.207
P083 Method for continuous multichannel measurement of impedance at the auricular sites innervated by various cranial nerves— T. Usichenko a,b,*, D. Gogola c, T. Dermek c, M. Teplan a,b,c (a McMaster University, Anesthesia, Hamilton, Canada,
Figure 1: Sample of the impedance monitoring using invasive (I) and non-invasive (NI) electrodes at the auricular sites and forearm of healthy male volunteer during resting period.
Figure 2: Sample of the impedance monitoring using invasive electrodes at the auricular sites of healthy male volunteer during heat pain stimulation (vertical line).
e48
Abstracts / Clinical Neurophysiology 128 (2017) e1–e163
b University Medicine of Greifswald, Anesthesiology, Greifswald, Germany, c Slovak Academy of Sciences, Institute of Measurement Science, Bratislava, Slovakia) ⇑
Corresponding author.
Question: External auricule receives afferent supply via vagal, trigeminal and cervical nerves (Peuker and Filler, 2002). Reduced impedance of the auricular sites innervated by vagal and trigeminal nerves is associated with pain and malfunction of internal organs (Oleson et al., 1980; Saku et al., 1993). The aim was to develop the robust method for continuous measurement of skin impedance at the sites of auricle, supplied by various cranial nerves. Methods: Multichannel device for continuous impedance measurement, based on Atmel ATmega16 microprocessor with 1 kHz of probing alternating current frequency was controlled using Matlab environment via USB port. The device measures voltage difference between the reference electrode (right forearm) and the sites of interest (innervation areas of cranial nerves) and transforms the voltage values into impedance using the calibration measurements of known resistances. Surface ECG and stainless steel needle electrodes were used at the sites of interest on the right auricles of healthy volunteers. Impedance monitoring was performed at rest and under the heat pain stimuli, delivered via CHEPS thermode (MEDOC analyser, Israel).
Results: Reproducible stable data with the voltage of 1 V, current values of 100 lA and impedance around 10 kX were acquired (Fig. 1), whereas invasive measurement yielded less variable data than non- invasive procedure. Heat pain stimulation led to differential reduction of the impedance in the sites of cranial nerve innervation (Fig. 2), whereas the decreased impedance recovered to the baseline values (Fig. 2). Conclusions: The multichannel continuous measurement of impedance at the external auricle was feasible. Further investigations are warranted to clarify the differential impedance response from the auricular sites in healthy subjects under stress challenge and patients. References Oleson et al. Pain eson et;8:217–29. Peuker, Filler. Clin Anatomy 2002;15:35–7. Saku et al. Clin Cardiol 1993;16:415–9. doi:10.1016/j.clinph.2016.10.208
P084 Electric field distribution in the lumbar spinal cord during transspinal magnetic stimulation—S.R. Fernandes a,b,*, R. Salvador a, C. Wenger a, M. de Carvalho b, P.C. Miranda a (a Institute of
Figure 1: E-field magnitude distribution in the SC for the PA configuration: left - WM total volume; centre and right - WM and GM lumbo-sacral slices 5 m.