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- W2007607885 abstract "A number of experiments were conducted to compare the ability of observers to extract unidirectional and bidirectional (transparent) global-motion signals. In the unidirectional condition, the noise signal consisted of purely randomly-moving dots while in the bidirectional condition, a number of the randomly moving dots were replaced by the same number of dots moving in a specific (secondary-signal) direction. The threshold measure was the minimum number of signal dots required to determine the global-motion direction. For the bidirectional condition, parameters varied were the angular separation between the global-motion and secondary-signal directions and the strength of the secondary signal. Thresholds for unidirectional and bidirectional conditions were the same when the angular difference between global-motion and secondary-signal directions were 90° or greater, i.e. the ability of observers to extract a transparent signal was the same as their ability to extract a unidirectional one. Similarly, with motion-in-depth signals, thresholds for extracting a centripetal signal were not elevated by replacing a number of the randomly-moving noise dots with the same number centrifugally-moving dots. The results are interpreted as indicating that motion signals moving between 90 and 180° to the global-motion direction provide uniform masking of the global-motion signal. For angular separations less than 90°, a suprathreshold secondary signal resulted in threshold elevation. This result could be due, to stronger inhibition from motion units tuned to similar (<90°) directions. broad directional-tuning of the underlying motion units (changing the task from signal detection to a signal discrimination) or a combination of the two." @default.
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- W2007607885 date "1999-06-01" @default.
- W2007607885 modified "2023-09-27" @default.
- W2007607885 title "Global-motion detection with transparent-motion signals" @default.
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- W2007607885 doi "https://doi.org/10.1016/s0042-6989(98)00325-3" @default.
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