Estimating peak velocity of rapid eye movements from video recordings
| Autor: | J. T. Enright |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
business.industry
Computer science Orientation (computer vision) Eye movement Experimental and Cognitive Psychology Standard deviation Saccadic masking medicine.anatomical_structure Amplitude Sampling (signal processing) Temporal resolution medicine Human eye Computer vision Psychology (miscellaneous) Artificial intelligence business General Psychology |
| Zdroj: | Behavior Research Methods, Instruments, & Computers. 30:349-353 |
| ISSN: | 1532-5970 0743-3808 |
| DOI: | 10.3758/bf03200664 |
| Popis: | Although video offers many advantages for recording human eye orientation, it involves such low temporal resolution (60 Hz) that it seems an unpromising method for evaluating the dynamics of rapid (saccadic) eye movements. This study demonstrates, nevertheless, that such measurements can provide surprisingly reliable estimates of the peak velocity of larger saccades. Simulations of 60-Hz sampling of eye position during idealized saccades provided replicated estimates of “apparent peak velocity.” The results indicate that when saccadic amplitude is about 10° or larger, estimates of peak velocity would on average be biased downward by less than 10%, with standard deviations due to measurement timing of less than 5%. Experimental data (from recordings of 10° and 20° saccades with customized video) demonstrate that these theoretical sources of uncertainty are considerably smaller than the trialto- trial variability in performance of real saccades. Reliability of video recording, however, rapidly deteriorates when saccades become smaller than about 10°. |
| Databáze: | OpenAIRE |
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