Cognition and motor timing diagnosis using smooth eye pursuit analysis
First Claim
1. A method of testing a subject for cognitive impairment, comprising:
- presenting the subject with a display of a smoothly moving object, repeatedly moving over a tracking path;
measuring the subject'"'"'s eye movements during the presenting;
comparing the measured eye movements with movements of the smoothly moving object to generate an error signal, the error signal corresponding to at least one of timing error, position error and velocity error of the subject'"'"'s eye movements during visual pursuit of the display of the smoothly moving object;
analyzing variability of the error signal during visual pursuit of the display of the smoothly moving object to generate a variability metric, wherein the variability metric corresponds to how accurately and how consistently the subject visually tracks movement of the object; and
presenting a report, based on at least the variability metric, that indicates whether the subject has a cognitive impairment.
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Abstract
A system for testing a subject for cognitive impairment includes a display, one or more video cameras and a computer. The display presents to the subject multiple stimuli, including a predictable, smoothly moving object, repeatedly moving over a same path. The video cameras sense eye movements of the subject, while the subject visually follows the object on the display. The computer analyzes the subject'"'"'s eye movements to determine, for example, accuracy and variability of the subject'"'"'s visual pursuit of the display of the smoothly moving object, and determines, based on the analysis, if the subject has a cognitive impairment. The analysis may provide one or more metrics, such as a metric of attention, a metric of fatigability and a metric of distractibility. The system may also be configured to provide feedback signals to the user, in which case the system also functions as cognition timing and motor training system.
134 Citations
18 Claims
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1. A method of testing a subject for cognitive impairment, comprising:
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presenting the subject with a display of a smoothly moving object, repeatedly moving over a tracking path; measuring the subject'"'"'s eye movements during the presenting; comparing the measured eye movements with movements of the smoothly moving object to generate an error signal, the error signal corresponding to at least one of timing error, position error and velocity error of the subject'"'"'s eye movements during visual pursuit of the display of the smoothly moving object; analyzing variability of the error signal during visual pursuit of the display of the smoothly moving object to generate a variability metric, wherein the variability metric corresponds to how accurately and how consistently the subject visually tracks movement of the object; and presenting a report, based on at least the variability metric, that indicates whether the subject has a cognitive impairment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of training a subject to improve anticipatory timing, comprising:
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presenting the subject with stimuli comprising a display of a smoothly moving object, repeatedly moving over a tracking path; measuring the subject'"'"'s eve movements during the presenting; comparing the measured eve movements with movements of the smoothly moving object to generate an error signal, the error signal corresponding to at least one of timing error, position error and velocity error of the subject'"'"'s eye movements during visual pursuit of the display of the smoothly moving object; analyzing variability of the error signal during visual pursuit of the display of the smoothly moving object to generate a variability metric, wherein the variability metric corresponds to how accurately and how consistently the subject visually tracks movement of the object; and presenting a subject feedback signal based on at least the variability metric. - View Dependent Claims (12)
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13. A system for testing a subject for cognitive impairment, comprising:
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a display to present to the subject stimuli comprising a smoothly moving object, repeatedly moving over a tracking path; a video sensor for measuring eye movements of the subject; and a computer configured to; present, on the display, the smoothly moving object, repeatedly moving over the tracking path; measure, using the video sensor, the subject'"'"'s eye movements during the presenting; compare the measured eye movements with movements of the smoothly moving object to generate an error signal, the error signal corresponding to at least one of timing error, position error and velocity error of the subject'"'"'s eye movements during visual pursuit of the display of the smoothly moving object; analyze variability of the error signal during visual pursuit of the display of the smoothly moving object to generate a variability metric, wherein the variability metric corresponds to how accurately and how consistently the subject visually tracks movement of the object; and present a report, based on at least the variability metric, that indicates whether the subject has a cognitive impairment. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification