Since scalp EEG recordings are measured in microvolts, electrical signals may easily interfere during an experiment. As Spehlmann discusses, such interference may be introduced through the lights in the recording room, a nearby television, or even a computer monitor [Spehlmann, 1991]. Thus, when we consider performing EEG/EP/ERP experiments within a virtual reality helmet containing an eye tracker, electrical interference becomes a real possibility. We tested the effects of wearing a VR4 virtual reality (VR) helmet containing an ISCAN eye tracker while asking subjects to do a continuous performance task. The results of this task were then analyzed in the frequency domain and compared to results from the same experiment while looking at a computer screen in two different environments. Results indicate that in an environment with other computers, the vertical refresh from the back of a nearby row of computer monitors added more noise to the signal than wearing the VR helmet and eye tracker. Even in an environment without other computers, the noise while wearing the VR helmet and eye tracker is not significantly different from the noise obtained while viewing a laptop computer screen in the same location.
[1]
Tzyy-Ping Jung,et al.
Extended ICA Removes Artifacts from Electroencephalographic Recordings
,
1997,
NIPS.
[2]
S. Garrel.
Spehlmann's EEG primer, 2e édition, BJ Fisch. Elsevier, New York (1990), 500 p.
,
1992
.
[3]
E. John,et al.
Evoked-Potential Correlates of Stimulus Uncertainty
,
1965,
Science.
[4]
Michael W. Haas,et al.
Navigating through virtual flight environments using brain-body-actuated control
,
1997,
Proceedings of IEEE 1997 Annual International Symposium on Virtual Reality.
[5]
P Berg,et al.
A multiple source approach to the correction of eye artifacts.
,
1994,
Electroencephalography and clinical neurophysiology.
[6]
D. Narayana Dutt,et al.
Line interference cancellation from corrupted EEG signals using modified linear phase FIR digital filters
,
1995,
Proceedings of the First Regional Conference, IEEE Engineering in Medicine and Biology Society and 14th Conference of the Biomedical Engineering Society of India. An International Meet.