Abstract
We investigated the effects of pursuit effort against the optokinetic nystagmus (OKN) on induced motion (IM) by measuring vertical IM and eye movements. Participants viewed an inducing stimulus (a random dot pattern) moving either upward or downward at the velocity of 10 or 40 °/s. A horizontally moving target (a single dot) was then presented within the inducing stimulus. Participants were asked to pursue the target and report the perceived slant of the target motion path by using a joystick. The results showed that IM magnitude was larger with an upward stimulation than with a downward stimulation. IM magnitude was also larger at 40 °/s than at 10 °/s. The results of eye movements prior to the target presentation showed that OKN was elicited more effectively with an upward stimulation than with a downward stimulation and at 40 °/s than at 10 °/s. OKN was markedly reduced when the target was presented within the inducing stimulus. These results support the oculomotor theory that IM magnitude reflects pursuit effort against OKN in response to an inducing stimulus.
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Notes
Because we used a flat screen, the velocity would be slightly slower at the periphery of the screen.
This value is the manufacturer’s specification based on measurements by using an artificial eye with pupil size of 4 mm. In the present study, the mean pupil size of participants during the task was 5.82 mm (SD = 0.97 mm). We contacted the company and confirmed that the spatial resolution in the present study was less than 0.1°.
We also conducted correlation analyses with other eye movement measures and found that the correlations were quite weak; the mean correlation coefficient over 11 participants was .194, .299, .194, and −.070 for standard deviation, amplitude, number of quick-phase saccades, and horizontal pursuit velocity, respectively.
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Author note
This research was supported by Grants-in-Aid for Young Scientists (B) 25870916 to Y.S. and for Scientific Research (B) 21300230 to K.I.
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Appendix
Appendix
For the mean IM magnitude, a two-way ANOVA showed significant main effects of velocity, F(1, 9) = 6.72, η p 2 = .427, p = .029, and direction, F(1, 9) = 6.30, η p 2 = .412, p = .033, and a significant interaction between velocity and direction, F(1, 9) = 7.56, η p 2 > .456, p < .023. Simple main effect of velocity was significant with upward stimulation, F(1, 9) = 17.27, η p 2 = .657, p = .003, while it was not with downward stimulation. Simple main effect of direction was significant at 40 °/s, F(1, 9) = 8.50, η p 2 = .486, p = .017, while it was not at 10 °/s.
For the mean slow-phase velocity, a three-way ANOVA showed significant main effects of interval, F(1, 9) = 112.76, η p 2 = .926, p < .001, velocity, F(1, 9) = 79.19, η p 2 = .898, p < .001, and direction, F(1, 9) = 7.92, η p 2 = .468, p = .020. There were significant interactions of interval and velocity, F(1, 9) = 61.00, η p 2 = .871, p < .001, and velocity and direction, F(1, 9) = 7.73, η p 2 = .462, p = .021. Subsequent analyses of interval × velocity revealed a significant simple main effect of velocity before the target onset, F(1, 9) = 76.02, η p 2 = .894, p < .001, but no significant effect of velocity after the onset of the target’s motion. Subsequent analyses of velocity × direction revealed significant differences between the two velocities with upward, F(1, 9) = 63.54, η p 2 = .876, p < .001, and downward, F(1, 9) = 7.71, η p 2 = .461, p = .022, stimulations. There were also significant differences between the two directions at 10 °/s, F(1, 9) = 6.34, η p 2 = .413, p = .033, and 40 °/s, F(1, 9) = 7.99, η p 2 = .470, p = .020.
For the standard deviation, a three-way ANOVA showed that all the main effects and interactions were significant [interval, F(1, 9) = 49.28, η p 2 = .846, p < .001; velocity, F(1, 9) = 54.88, η p 2 = .859, p < .001; direction, F(1, 9) = 23.78, η p 2 = .725, p = .001; interval × velocity, F(1, 9) = 17.69, η p 2 = .663, p = .002; interval × direction, F(1, 9) = 18.78, η p 2 = .676, p = .002; velocity × direction, F(1, 9) = 29.21, η p 2 = .764, p < .001; interval × velocity × direction, F(1, 9) = 23.77, η p 2 = .725, p = .001]. Separate ANOVAs showed significant main effects of velocity, F(1, 9) = 34.23, η p 2 = .792, p < .001, and direction, F(1, 9) = 35.25, η p 2 = .797, p < .001, and a significant interaction between velocity and direction, F(1, 9) = 42.31, η p 2 = .825, p < .001. Subsequent analyses showed significant differences between the two velocities with upward, F(1, 9) = 69.76, η p 2 = .886, p < .001, and downward, F(1, 9) = 7.24, η p 2 = .446, p = .025, stimulations. There were also significant differences between the two directions at 10 °/s, F(1, 9) = 11.18, η p 2 = .554, p = .008, and 40 °/s, F(1, 9) = 43.48, η p 2 = .828, p < .001. No effect or interaction was significant after the initiation of target stimulus motion.
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Seya, Y., Ishihara, M. & Imanaka, K. Up–down asymmetry in vertical induced motion and optokinetic nystagmus. Atten Percept Psychophys 77, 220–233 (2015). https://doi.org/10.3758/s13414-014-0734-z
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DOI: https://doi.org/10.3758/s13414-014-0734-z