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Short-Latency Fixational Saccades Induced by Luminance Increments Gregory D. Horwitz and Thomas D. Albright
 

Summary: report
Short-Latency Fixational Saccades Induced by Luminance Increments
Gregory D. Horwitz and Thomas D. Albright
Howard Hughes Medical Institute and Vision Center Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037
Submitted 14 February 2003; accepted in final form 9 April 2003
Horwitz, Gregory D. and Thomas D. Albright. Short-latency fixa-
tional saccades induced by luminance increments. J Neurophysiol 90:
13331339, 2003; 10.1152/jn.00146.2003. We investigated the effect
of peripheral visual stimulation on small-amplitude saccades that
occur naturally during fixation. Two macaque monkeys were re-
warded for fixating while a colorful stimulus flickered randomly in the
periphery. Reverse correlation revealed a lawful relationship between
the stimulus sequence and saccade occurrences: on average, a tran-
sient increase in stimulus intensity evoked saccades at a latency of
70 ms. The spectral tuning of this increase was roughly, but not
exactly, consistent with a pure luminance increase. We conclude that
peripheral luminance increases can evoke fixational saccades.
I N T R O D U C T I O N
Peripheral visual stimuli can capture attention, but whether
such stimuli obligatorily engage the oculomotor system is a matter

  

Source: Albright, Tom - Vision Center Laboratory, Salk Institute for Biological Studies

 

Collections: Biology and Medicine