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J Neurophysiol (March 23, 2005). doi:10.1152/jn.01339.2004
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Submitted on December 29, 2004
Accepted on March 17, 2005

Primate memory saccade amplitude after intervened motion depends on target distance

Nuo Li1, Min Wei1, and Dora E. Angelaki1*

1 Dept of Neurobiology & Biomedical Engineering, Washington University, St Louis, MO, USA

* To whom correspondence should be addressed. E-mail: angelaki{at}pcg.wustl.edu.

To keep a stable internal representation of the visual world as our eyes, head and body move around, humans and monkeys must continuously adjust neural maps of visual space using extra-retinal sensory or motor cues. When such movements include translation, the amount of body displacement must be weighted differently in the updating of far versus near targets. Using a memory-saccade task, we have investigated whether non-human primates can benefit from this geometry when passively moved sideways. We report that monkeys made appropriate memory saccades, taking into account not only the amplitude and nature (rotation versus translation) of the movement, but also the distance of the memorized target: i.e., the amplitude of memory saccades was larger for near versus far targets. The scaling by viewing distance, however, was less than geometrically required, such that memory saccades consistently undershot near targets. Such a less than ideal scaling of memory saccades is reminiscent of the viewing distance-dependent properties of the vestibulo-ocular reflex. We propose that a similar viewing distance-dependent vestibular signal is used as an extra-retinal compensation for the visuomotor consequences of the geometry of motion parallax by scaling both memory saccades and reflexive eye movements during motion through space.




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