Deconvolution and modeling of overlapping visual evoked potentials

Jorge Bohorquez, Sebastian Lozano, Alexander Kao, Jonathon Toft-Nielsen, Ozcan Ozdamar

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

Abstract

Visual Evoked Potentials (VEPs) are brain signals generated in response to visual stimuli which are used in the diagnosis of neuro-ophthalmic disorders and the development of brain computer interfaces (BCI). When a pattern-reversal stimulus is delivered at low rates, the acquired transient VEP response (VEPtr) represents the activation of neural structures in the visual pathway. For stimulation rates above six reversals per second (rps), response overlapping occurs and steady state responses are formed (VEPss). This study investigates VEP adaptation by deconvolving responses to temporally jittered stimuli at high rates. VEPs were obtained from normal subjects stimulated with a LED based pattern reversal stimulator delivering three steady-state (1.63, 8.14 and 13.02 rps) and two low-jitter (8.14 and 13.02 mean rps) sequences. Using the Continuous Loop Averaging Deconvolution (CLAD) method VEPtrs were extracted from the jittered responses. To verify the quality of the deconvolution process, the high-rate isochronic VEPss were compared with a synthetic response estimated with the VEPtr. Consistent VEPs (P100-N135) were obtained from all subjects at all rates. At high rates, latencies were slightly shorter while amplitudes were reduced differentially for P100 (80%) and N135 (20%). Models constructed using VEPtr, reliably predicted 8rps and 13rps VEPss confirming high SNR obtained in BCI applications.

Original languageEnglish
Title of host publicationProceedings - 29th Southern Biomedical Engineering Conference, SBEC 2013
Pages31-32
Number of pages2
DOIs
StatePublished - Aug 5 2013
Event29th Southern Biomedical Engineering Conference, SBEC 2013 - Miami, FL, United States
Duration: May 3 2013May 5 2013

Other

Other29th Southern Biomedical Engineering Conference, SBEC 2013
CountryUnited States
CityMiami, FL
Period5/3/135/5/13

Fingerprint

Bioelectric potentials
Deconvolution
Brain computer interface
Jitter
Light emitting diodes
Brain
Chemical activation

ASJC Scopus subject areas

  • Biomedical Engineering

Cite this

Bohorquez, J., Lozano, S., Kao, A., Toft-Nielsen, J., & Ozdamar, O. (2013). Deconvolution and modeling of overlapping visual evoked potentials. In Proceedings - 29th Southern Biomedical Engineering Conference, SBEC 2013 (pp. 31-32). [6525661] https://doi.org/10.1109/SBEC.2013.24

Deconvolution and modeling of overlapping visual evoked potentials. / Bohorquez, Jorge; Lozano, Sebastian; Kao, Alexander; Toft-Nielsen, Jonathon; Ozdamar, Ozcan.

Proceedings - 29th Southern Biomedical Engineering Conference, SBEC 2013. 2013. p. 31-32 6525661.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Bohorquez, J, Lozano, S, Kao, A, Toft-Nielsen, J & Ozdamar, O 2013, Deconvolution and modeling of overlapping visual evoked potentials. in Proceedings - 29th Southern Biomedical Engineering Conference, SBEC 2013., 6525661, pp. 31-32, 29th Southern Biomedical Engineering Conference, SBEC 2013, Miami, FL, United States, 5/3/13. https://doi.org/10.1109/SBEC.2013.24
Bohorquez J, Lozano S, Kao A, Toft-Nielsen J, Ozdamar O. Deconvolution and modeling of overlapping visual evoked potentials. In Proceedings - 29th Southern Biomedical Engineering Conference, SBEC 2013. 2013. p. 31-32. 6525661 https://doi.org/10.1109/SBEC.2013.24
Bohorquez, Jorge ; Lozano, Sebastian ; Kao, Alexander ; Toft-Nielsen, Jonathon ; Ozdamar, Ozcan. / Deconvolution and modeling of overlapping visual evoked potentials. Proceedings - 29th Southern Biomedical Engineering Conference, SBEC 2013. 2013. pp. 31-32
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