Smooth eye movement response to complex motion sequences / Julie Mapes Lindholm, Paul A. Wetzel, Timothy M. Askins.

Format:

Book

Government document

Author/Creator:

Lindholm, Julie Mapes, 1941- author.

Wetzel, P. A., author.

Askins, Timothy M., author.

Contributor:

Armstrong Laboratory (U.S.). Aircrew Training Research Division, sponsoring body.

Hughes Training, Inc. Training Operations, issuing body.

Series:

AL/HR-TR ; 1996-0040.

AL/HR-TR ; 1996-0040

Language:

English

Subjects (All):

Eye--Movements.

Eye.

Physical Description:

1 online resource (v, 34 pages) : illustrations

Place of Publication:

Brooks Air Force Base, Tex. : Air Force Materiel Command, Armstrong Laboratory, September 1996.

Summary:

To examine the spatiotemporal properties of the motion sensors for the smooth pursuit system, we presented horizontal motion sequences in which successive target displacements were in accord with a composite waveform representing the sum of a constant velocity ramp and a sawtooth. The sequences differed in global velocity (GV = ramp velocity = 0 or 4 deg/sec), local velocity (LV = ramp velocity + sawtooth velocity = -8 or -4 deg/sec, for GV =0, and -8, -4,0, 8, 12 deg/sec, for GV = 4), and local-segment duration (12 values between 67 and 700 msec). When the duration of a local-velocity segment was relatively short C less than or equal to 133 msec, for GV =4 deg/sec; less than or equal to 200 msec, For GY =0 deg/sec), mean pursuit velocity matched the GV. As the segment duration increased, mean pursuit velocity shifted gradually toward the LV. Changes in cumulative saccadic amplitude mirrored the changes in smooth pursuit velocity. The spatiotemporal-frequency spectra of the motion sequences suggested that the pursuit system responded in accord with the drift velocities of very low spatial frequencies. The spectra of the space-time retinal images suggested that pursuit was maintained not by the absence of retinal image motion but by the presence of appreciable spectral energy for components with a drift velocity of approximately zero.

Notes:

Title from title screen (viewed Nov. 19, 2014).

"Hughes Training, Inc., Training Operations."

Includes bibliographical references (pages 33-34).

Other Format:

Microfiche version: Lindholm, Julie Mapes, 1941- Smooth eye movement response to complex motion sequences

OCLC:

227836241