AUTHOR=de Tommaso Marina , Ricci Katia , Montemurno Anna , Vecchio Eleonora , Invitto Sara 

TITLE=Walking-Related Dual-Task Interference in Early-to-Middle-Stage Huntington's Disease: An Auditory Event Related Potential Study

JOURNAL=Frontiers in Psychology

VOLUME=Volume 8 - 2017

YEAR=2017

URL=https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2017.01292

DOI=10.3389/fpsyg.2017.01292

ISSN=1664-1078

ABSTRACT=OBJECTIVE To compare interference between walking and a simple P3 auditory odd-ball paradigm in patients with Huntington’s disease (HD) and age- and sex-matched controls. 
METHODS Twenty-four early-to-middle-stage HD patients and 14 age- and sex-matched healthy volunteers were examined. EEG – EMG recordings were obtained from 21 scalp electrodes and 8 bipolar derivations from the legs. Principal component analysis was used to obtain artifact-free recordings. The stimulation paradigm consisted of 50 rare and 150 frequent stimuli and was performed in two conditions: standing and walking along a 10 by 5 meter path. P3 wave amplitude and latency and EEG and EMG spectral values were compared by group and experimental condition and correlated with clinical features of HD.
RESULTS P3 amplitude increased during walking in both HD patients and controls. This effect was inversely correlated with motor impairment in HD patients, who showed a beta-band power increase over the parieto-occipital regions in the walking condition during the P3 task. Walking speed and counting of rare stimuli were not compromised by concurrence of motor and cognitive demands. 
CONCLUSION Our results showed that walking increased P3 amplitude in an auditory task, in both HD patients and controls. Concurrent cognitive and motor stimulation could be used for rehabilitative purposes as a means of enhancing activation of cortical compensatory reserves, counteracting potential negative interference and promoting the integration of neuronal circuits serving different functions.