Dynamic peripheral stimuli for visual field testing and therapy
A method is provided for stimulating a motion-detecting visual pathway of a subject. A subject is tasked with fixating on a central stimulus displayed on a computer-driven display. While the subject is visually fixated, a peripheral stimulus is presented on the display. At least one characteristic of the peripheral stimulus is altered so as to trigger the motion-sensitive visual pathway of the subject. The altered characteristic may be the spatial locus, size, pattern, luminosity or hue of the stimulus. The altered and base stimulus may be alternately displayed in a cyclical manner to sustain the display of a dynamic peripheral stimulus. While alternately displaying the base and altered stimulus, the subject's response, indicative of their detection of the stimulus, may be monitored and recorded. The dynamic peripheral stimulus may be, for example, a repetitively translating object, or a repetitively blinking object.
1. A method for stimulating the motion-detecting visual pathway of a subject, the method comprising:
(a) instructing the subject to fixate upon a central fixation stimulus;
(b) providing a peripheral stimulus displayed upon a computer-driven display;
(c) altering at least one characteristic of the peripheral stimulus; and
(d) iterating steps (b) and (c) in a manner that displays a first dynamic peripheral stimulus within a first narrowly bounded region that targets a corresponding visual field region that is substantially smaller than the entire visual field and that triggers recognition by the motion-sensitive visual pathway.
2. A method in accordance with claim 1 , further comprising repeating steps (a)-(d) in a second narrowly bounded region so as to create a second dynamic peripheral stimulus.
3. A method in accordance with claim 2 , further comprising:
recording the subject's input in response to one of the first and second dynamic peripheral stimuli.
4. A method according to claim 3 , further comprising instructing the subject to respond to the presence of the peripheral stimulus via a computer input device.
5. A method according to claim 3 , further comprising instructing the subject to maintain fixation on the fixation stimulus while the peripheral stimulus is presented to the subject.
6. A method in accordance with claim 1 , wherein the at least one characteristic is selected from the group consisting of spatial locus, size, pattern, luminosity, and hue.
7. A method in accordance with claim 1 , wherein the dynamic peripheral stimulus is selected from the group consisting of a repetitively translating object and a repetitively blinking object.
8. A method according to claim 1 , further comprising determining the bounds of a subject's motion-sensitive visual field and presenting the peripheral stimulus within the determined motion-sensitive visual field.
9. A computer system for stimulating the motion-detecting visual pathway of a subject, the system comprising:
(a) means for tasking the subject to fixate upon central fixation stimulus;
(b) means for providing a peripheral stimulus displayed upon a computer-driven display; and
(c) means for altering at least one characteristic of the peripheral stimulus so as to trigger recognition by the motion-sensitive visual pathway; and
(d) means for iterating steps (b) and (c) in a manner that displays a dynamic peripheral stimulus within a first narrowly bounded region that targets a corresponding visual field region that is substantially smaller than the entire visual field and that triggers recognition by the motion-sensitive visual pathway.
10. A system in accordance with claim 9 , further comprising means for repeating steps (a) through (d) in a second narrowly bounded region.
11. A system in accordance with claim 9 , wherein the at least one characteristic is selected from the group consisting of spatial locus, size, pattern, luminosity, and hue.
12. A system in accordance with claim 9 , further comprising:
means for recording the subject's input in response to one of the first and second dynamic peripheral stimulus.
13. A system in accordance with claim 9 , wherein the peripheral stimulus is selected from the group consisting of a repetitively translating object and a repetitively blinking object.
14. A system in accordance with claim 9 , further comprising means for determining the bounds of a subject's motion-sensitive visual field and means for presenting the peripheral stimulus within the determined motion-sensitive visual field.