Keck I R, Fischer V, Lang E W, 2009, "Direct estimation of the point of gaze from fMRI data" Perception 38 ECVP Abstract Supplement, page 169
Direct estimation of the point of gaze from fMRI data
I R Keck, V Fischer, E W Lang
Task compliance tests form an important part in visual functional magnetic resonance imaging (fMRI) experiments. Infrared based eye-trackers are a well proven solution to estimate the point of gaze of the subject, however their use is often time-consuming, costly, uncomfortable for the subjects and sometimes even impossible due to head size and space restrictions in head-only scanners. Here we present a novel analysis technique that quantifies the eye movement directly from the fMRI data without the aid of dedicated eye-trackers. We show that by using the parts of the functional image data that contain the motion artefacts of the subject's eyes and by applying spatial independent component analysis, it is possible to detect eye movement and to estimate the direction of the eyes' point of gaze at the time of data acquisition. By means of various simple saccade experiments we were able to demonstrate that our method yields results comparable to the infrared eye-tracker data within the limitations of temporal resolution from fMRI image acquisition. Finally we present an open source SPM toolbox with the implementation of our technique.
These web-based abstracts are provided for ease of seaching and access, but certain aspects (such as as mathematics) may not appear in their optimum form. For the final published version of this abstract, please see
ECVP 2009 Abstract Supplement (complete) size: 2236 Kb
[Publisher's note: The abstracts in this year's ECVP supplement have been published with virtually no copy editing by Pion, thus the standards of grammar and style may not match those of regular Perception articles.]