Publications (6)2.02 Total impact
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Article: Breaks in Presence in Virtual Environments: An Analysis of Blood Flow Velocity Responses.
Presence. 01/2011; 20:273-286. -
Conference Proceeding: Analyzing Neural Correlates of Attentional Changes during the Exposure to Virtual Environments: Application of Transcranial Doppler Monitoring.
Foundations of Augmented Cognition. Directing the Future of Adaptive Systems - 6th International Conference, FAC 2011, Held as Part of HCI International 2011, Orlando, FL, USA, July 9-14, 2011. Proceedings; 01/2011 -
Article: A new visually evoked cerebral blood flow response analysis using a low-frequency estimation.
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ABSTRACT: Transcranial Doppler (TCD) has been widely used to monitor cerebral blood flow velocity (BFV) during the performance of cognitive tasks compared with repose periods. Although one of its main advantages is its high temporal resolution, only some of the previous functional TCD studies have focused on the analysis of the temporal evolution of the BFV signal and none of them has performed a spectral analysis of the signal. In this study, maximum BFV data in both posterior cerebral arteries was monitored during a visual perception task (10 cycles of alternating darkness and illumination) for 23 subjects. A peak was located in the low-frequency band of the spectrum of the maximum BFV of each subject both during visual stimulation and repose periods. The frequency of this peak was in the range between 0.037 and 0.098Hz, depending on the subject, the vessel and the experimental condition. The component of the signal at this frequency, which is associated with the slow variations caused by the visual stimuli, was estimated. That way, the variations in BFV caused by the experimental stimuli were isolated from the variations caused by other factors. This low-frequency estimation signal was used to obtain parameters about the temporal evolution and the magnitude variations of the BFV in a reliable way, thus, characterizing the neurovascular coupling of the participants.Ultrasound in medicine & biology 03/2010; 36(3):383-91. · 2.02 Impact Factor -
Article: Brain activity and presence: a preliminary study in different immersive conditions using transcranial Doppler monitoring.
Virtual Reality. 01/2010; 14:55-65. -
Article: A Neuroscience Approach to Virtual Reality Experience Using Transcranial Doppler Monitoring.
Presence. 01/2009; 18:97-111. -
Conference Proceeding: Transcranial Doppler: A Tool for Augmented Cognition in Virtual Environments.
Foundations of Augmented Cognition. Neuroergonomics and Operational Neuroscience, 5th International Conference, FAC 2009 Held as Part of HCI International 2009 San Diego, CA, USA, July 19-24, 2009, Proceedings; 01/2009
