Sensors 2013, 13(4), 5099-5108; doi:10.3390/s130405099
Article

A Low-Cost, Computer-Interfaced Drawing Pad for fMRI Studies of Dysgraphia and Dyslexia

Received: 20 March 2013; in revised form: 10 April 2013 / Accepted: 11 April 2013 / Published: 17 April 2013
(This article belongs to the Special Issue Medical & Biological Imaging)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: We have developed a pen and writing tablet for use by subjects during fMRI scanning. The pen consists of two jacketed, multi-mode optical fibers routed to the tip of a hollowed-out ball-point pen. The pen has been further modified by addition of a plastic plate to maintain a perpendicular pen-tablet orientation. The tablet is simply a non-metallic frame holding a paper print of continuously varying color gradients. The optical fibers are routed out of the MRI bore to a light-tight box in an adjacent control room. Within the box, light from a high intensity LED is coupled into one of the fibers, while the other fiber abuts a color sensor. Light from the LED exits the pen tip, illuminating a small spot on the tablet, and the resulting reflected light is routed to the color sensor. Given a lookup table of position for each color on the tablet, the coordinates of the pen on the tablet may be displayed and digitized in real-time. While simple and inexpensive, the system achieves sufficient resolution to grade writing tasks testing dysgraphic and dyslexic phenomena.
Keywords: fMRI; MRI-compatible; dygraphia; dyslexia; lexical; handwriting; LabVIEW
PDF Full-text Download PDF Full-Text [877 KB, Updated Version, uploaded 21 June 2014 06:58 CEST]
The original version is still available [1768 KB, uploaded 21 June 2014 06:58 CEST]

Export to BibTeX |
EndNote


MDPI and ACS Style

Reitz, F.; Richards, T.; Wu, K.; Boord, P.; Askren, M.; Lewis, T.; Berninger, V. A Low-Cost, Computer-Interfaced Drawing Pad for fMRI Studies of Dysgraphia and Dyslexia. Sensors 2013, 13, 5099-5108.

AMA Style

Reitz F, Richards T, Wu K, Boord P, Askren M, Lewis T, Berninger V. A Low-Cost, Computer-Interfaced Drawing Pad for fMRI Studies of Dysgraphia and Dyslexia. Sensors. 2013; 13(4):5099-5108.

Chicago/Turabian Style

Reitz, Frederick; Richards, Todd; Wu, Kelvin; Boord, Peter; Askren, Mary; Lewis, Thomas; Berninger, Virginia. 2013. "A Low-Cost, Computer-Interfaced Drawing Pad for fMRI Studies of Dysgraphia and Dyslexia." Sensors 13, no. 4: 5099-5108.

Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert