Changes in EEG power spectra during biofeedback of slow cortical potentials in epilepsy.
ABSTRACT The goal of the study was to explore parallel changes in EEG spectral frequencies during biofeedback of slow cortical potentials (SCPs) in epilepsy patients. Thirty-four patients with intractable focal epilepsy participated in 35 sessions of SCP self-regulation training. The spectral analysis was carried out for the EEG recorded at the same electrode site (Cz) that was used for SCP feedback. The most prominent effect was the increase in the theta 2 power (6.0-7.9 Hz) and the relative power decrement in all other frequency bands (particularly delta 1, alpha 2 and beta 2) in transfer trials (i.e., where patients controlled their SCPs without continuous feedback) compared with feedback trials. In the second half of the training course (i.e., sessions 21-35) larger power values in the delta, theta, and alpha bands were found when patients were required to produce positive versus negative SCP shifts. Both across-subject and across-session (within-subject) correlations between spectral EEG parameters, on the one hand, and SCP data, on the other hand, were low and inconsistent, contrary to high and stable correlations between different spectral variables. This fact, as well as the lack of considerable task-dependent effects during the first part of training, indicates that learned SCP shifts did not directly lead to the specific dynamics of the EEG power spectra. Rather, these dynamics were related to nonspecific changes in patients' brain state.
SourceAvailable from: Ellen Broelz
Chapter: Neurofeedback and Epilepsy[Show abstract] [Hide abstract]
ABSTRACT: This chapter introduces the published research on neurofeedback and epilepsy, followed by a description of the clinical protocols typically used and illustrated with case examples when appropriate. Then, the use of qEEG (electroencephalography) to improve outcome is described. The research on neurofeedback and epilepsy has historically been limited (of necessity) to small sample sizes and only a single group for which pre- and post-treatment effects are determined. One exception was a study using SCP, which was a controlled study with between-group comparisons. Despite these limitations, results have been consistent across studies, generally suggesting that neurofeedback leads to reduction in seizures. The chapter argues that the studies utilizing SCP training, though not as numerous, also show positive outcomes.Neurofeedback and Neuromodulation Techniques and Applications, Edited by Robert Coben and James R. Evans, 10/2010: chapter 7: pages 183-203; Academic Press., ISBN: 978-0-12-382235-2
Chapter: Biofeedback.[Show abstract] [Hide abstract]
ABSTRACT: Biofeedback is an evidence-based approach to enhancing personal awareness and control over body and mind. Biofeedback combines the values of the complementary and alternative medicine movement with the biotechnology of modern scientific medicine. The basic biofeedback paradigm suggests that whenever we provide a human being with feedback on about a biological process, that feedback enables the individual to increase awareness of the process, and gain conscious control. Biofeedback uses electronic instruments to monitor and feed back information on about physiological responses1,2.Textbook of complementary and alternative medicine, 2nd edited by C.-S. Yuan, E. J. Bieber, B. A. Bauer, 01/2006: chapter Biofeedback.; Informa Healthcare..
Neurofeedback and Neuromodulation Techniques and Applications, Edited by Robert Coben, James Evans, 01/2011: chapter 14: pages 381-402; Academic Press.