Dear Govinda,
I think the use of a blocked design or an event related
design depends on whether you want to measure e. g.
reaction times of your eye movements to a stimulus which
would be events/vectors of onset for your statistical
analysis of the FMRI data (event related design) or if the
timing of your tasks can be fix and you stimulate e.g.
alternating rest and stimulation conditions and randomize
only the order of the stimulation conditions (fixed effects
design) each task lasting e.g. 20sec.
In every way it would make sense to record your eye
movements in parallel to a trigger signal of the scanner
and, if possible, e.g. an analogue signal of your task.
It is an established method to e.g. correlate BOLD signal
and eye movement performance (e.g. gain, phase, saccadic
frequency of correction saccades..).
See one older and a new paper concerning eye movement
measurements and fMRI.
Exp Brain Res (1999) 126:443–449 © Springer-Verlag 1999
RESEARCH NOTE
H. Kimmig • M.W. Greenlee • F. Huethe • T. Mergner
MR-Eyetracker: a new method for eye movement recording in
functional magnetic resonance imaging
Parametric modulation of cortical activation during smooth
pursuit with and without target blanking. An fMRI study
Matthias Nagel, Andreas Sprenger, Silke Zapf, Christian
Erdmann,Detlef Kömpf, Wolfgang Heide, Ferdinand Binkofski,
and Rebekka Lencer
Received 22 February 2005; revised 26 August 2005; accepted
31 August 2005
Hope that helps!
Sabine
On Thu, 20 Jul 2006 09:31:17 +1200
Govinda Poudel <[log in to unmask]> wrote:
> Hi there,
>
>
>
> I am designing a continuous visuomotor tracking
> experiment. Being a beginner
> to fMRI, I am investigating on possibilities of using
> various
> well-established paradigms for the experiment. I have
> some basic questions,
> which I need to clarify.
>
>
>
> 1) How can we fit a continuous tracking experiment
> into more
> conventional and well established discrete "blocked",
> "event-related" or
> mixed designs? Are there different paradigm approaches
> for continuous
> experiments?
>
> 2) Any important issues that I need to take into
> account while running
> a continuous experiment?
>
> 3) Since it is not a discrete stimulus-response type
> experiment, we
> will base our analysis on behaviour (such as tracking
> performance, eye
> movement etc). How well established are these type of
> analysis? Any paper
> you are aware of?
>
>
>
> Regards,
>
> Govinda
>
Sabine Ohlendorf
Neurologische Universitätsklinik
Breisacher Str. 64
D-79106 Freiburg
Germany
Tel. ++49-(0)761-270-5331
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