Hi,
I think you recorded a multistep saccade as reported by Rucker et al (2004) or Huebner et al (2007). You will find detailed information in Leigh & Zee: The Neurology of Eye Movements, Chapter 3. These multistep saccades can be found in patients as well in healthy controls (but to a lesser proportion ;-)).
Cheers
Andreas
Rucker JC, Shapiro BE, Han YH, et al. Neuroophthalmology of late-onset Tay-Sachs disease (LOTS). Neurology 2004;63:1918-1926.
Huebner J, Sprenger A, Klein C, et al. (2007). Eye movement abnormalities in spinocerebellar ataxia type 17 (SCA17). Neurology. Sep 11; 69(11):1160-8.
> -----Ursprüngliche Nachricht-----
> Von: Eye-movement mailing list
> [mailto:[log in to unmask]] Im Auftrag von
> Komogortsev, Oleg V
> Gesendet: Freitag, 3. September 2010 17:24
> An: [log in to unmask]
> Betreff: [EM_LIST] Automated recognition of complex
> oculomotor behaviour
>
> Hello everybody,
>
> In our lab we are trying to develop reliable algorithms for
> classification of complex oculomotor behavior, with some
> details described in http://ecommons.txstate.edu/cscitrep/18/
> Recently we have acquired EyeLink II and we are trying to
> classify some of the oculomotor events that became visible
> when recording is conducted at the frequency of 1000Hz or higher.
> We are presenting horizontal step stimulus to the subject.
>
>
> We have encountered an event where a saccade to a target is
> slightly broken in the middle, the event does not look like
> an express saccade, i.e. there is not enough latency in the
> between the pieces. The picture of the event is present here
> http://daizanxun.blog.com/files/2010/09/eye-movement.jpg
>
>
> My question what is it?
>
> May be it is equipment slippage? Or maybe saccade trajectory
> change during some sort of the neuronal control noise during
> saccade's pulse?
> I was not been able to find an example of this type of
> behavior in the research literature and I was hoping that
> somebody would be able to point me to the correct source.
>
> Thank you in advance.
>
> ---Oleg
>
> ---
> Dr. Oleg Komogortsev
> Assistant Professor
> Texas State University-San Marcos
> Department of Computer Science
> 601 University Drive
> San Marcos, TX 78666-4616
> Phone: (512) 245-0349 Fax: (512) 245-8750
> Email: [log in to unmask]<mailto:[log in to unmask]>
> Webpage: www.cs.txstate.edu/~ok11<http://www.cs.txstate.edu/~ok11>
>
>
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