Does P3 Reflect Speech Quality Change? Controlling for Auditory Evoked Activity in EventRelated Brain Potential (ERP) Waveforms The P3 component of the eventrelated brain potential (ERP) is promoted as an indicator of perceived change in speech quality. However, previously identified effects of quality change on P3 might actually be traced back to modulations in earlier portions of the ERP signal, evoked by physical variability between test stimuli. The present study introduces a rigorous control procedure to isolate late ERP signal portions by eliminating such physical stimulus confounds. Due to successful removal of auditory evoked activity, observed qualityrelated ERP signal modulations can be attributed to P3 with higher validity. The implemented control procedure promises to form an essential part of future experimental designs in psychophysiological assessment of multimedia quality.

The Effect that Auxiliary Taxonomized Auditory Distractions have on a P300 Speller while utilising Low Fidelity Equipment In this paper, we ensue on the development of a taxonomy aimed at categorizing distractions in the P300b domain. Explicitly, we investigate the effect that auditory distractions, distinctively that of ambient noise (AN), passive talking (PT), and active listening (AL) have on the signal of a visual P300 Speller in terms of accuracy, amplitude, latency, user preference, signal morphology, and overall signal quality. This work is part of a larger EEG based project and is based on the P300 speller BCI (oddball) paradigm and the xDAWN algorithm, with eight healthy subjects; while using a noninvasive BrainComputer Interface based on low fidelity electroencephalographic (EEG) equipment. Our results show that the accuracy was best for the Lab (LC) at 100%, followed by AN at 92.5%, PT at 90% and last AL at 87.5%, which results were in identical order to the subjectsxe2x80x99 preferences. In addition, the amplitude and latency did not show any statistical significance in all settings. This paper provides additional results that impart insight into the practicability of the aforementioned P300 speller methodology and lowcost equipment to be used in realworld applications.