contaminated and non-stationary neural signals produced by the human brain. There are a number of brain signal features that can be used in BCls. For example, P300 as used in studies such as [11][12] presents visual stimuli to the participant using flashing imagery. The P300 potential is a positive deflection seen in ongoing EEG signal with a latency of 250ms to 500ms post stimulus. The P300 stimulus is often elicited using the oddball paradigm which presents sequences of repetitive visual stimuli to the BCI user and by randomly presenting a divergent stimulus among the repetitive stimulus to the user, a P300 potential can be elicited. Although high accuracies (>90%) can be achieved with its use and low requirement for user training, the inherent nature of flashing imagery can cause some visual fatigue for users of P300 VEPs. Steady State Visual Evoked Potentials (SSVEP) as used in [13][14] also makes use of flashing imagery to evoke visual potentials which are readable from the EEG. SSVEP works by presenting images to the user which flash at different but fixed frequencies. It is the frequency of the individual flashing items which produces recognisable properties in the ongoing EEG signal. SSVEP also provides high system accuracies (>90%) and can be used without training but SSVEP can also cause visual fatigue to the user, so its use for video games may not be fully justified in an already visually rich environment. mY EP uses moving imagery to elicit a response from the dorsal pathway of the brain [15][16] which provides a more visually pleasing and less fatiguing method of producing stimuli than other VEPs such as P300 and SSVEP. An mVEP response is composed of three main peaks post stimulus namely the PI 00 a positive peak observed lOOms after stimulus, the N200 negative going peak 200ms following stimulus presentation and the P300 positive going peak observed in the ongoing EEG signal around 240ms post stimulus. The brief motion of visual stimuli generates neural activations in the Medial Superior Temporal (MST) area of the brain which forms part of the cerebral cortex in the dorsal stream. The detection of motion takes place primarily in the Middle Temporal (MT) area of the brain. In a previous study [17] we investigated how mY EP classification accuracy was affected by increasing visual complexity using a rudimentary 3D based game presentation that did not utilise high fidelity graphics. In this study however, we have used commercially available video games that cover five different generations of game consoles. The games chosen represent the state of the art of each games
respective hardware technologies and era of graphical technology. Each of the games used were chosen according to their graphical maturity and gradually increased in graphic complexity. Also, the games presented cover a range of genres such as arcade, 2D platform, 3D platform, racing simulation and first person shooter to ensure adequate coverage of gameplay mechanics and dynamics [18][19]. Section 2 provides details on the methodology for the study. Section 3 is the data analysis section. Section 4 presents the results of the study. Section 5 provides a discussion and section 6 concludes the paper.