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• W2062202222 abstract "Continuous motion is commonly represented on video displays and film by a succession ofdiscrete samples. As the temporal sampling of the continuous motion is increased, the appearance of the discrete samples becomes quite similar to the appearance of continuous motion (Sperling, 1976). When the continuous motion is not sampled at a high enough rate, the appearance of continuous motion is destroyed (Watson, Ahumada, & Farrell, 1983). In this case, we say the image motion has been undersampled. Depending on the nature of the motion and the undersamp1ing, the appearance of the discrete samples can take on a variety of forms. One form of undersampling that destroys the appearance of continuous motion occurs when a line is moving rapidly but the sampling rate is slightly lower than required to accurately represent the line's appearance. This undersamp1ing results in the appearance of a set of lines that are present simultaneously at the spatial locations where the continuously moving line was sampled. Farrell (1984) measured the stimulus parameters at which this kind of undersampling occurs as well as some of the perceptual consequences of this form of undersampling. By asking the observers to report how many lines they saw on the screen simultaneously, she obtained a measure of the visible persistence ofthe first line. Farrell varied the angular distance between samples, OX, and the time between samples, 01. She concluded that when measured as part of a sequence of discrete samples, the visible persistence of the first sample was proportional to the angular distance separating the sample from samples occurring later in time. She noted that if the visible persistence to the first sample reflected the activity of a neural substrate, then that activity was reduced in duration by the spatially and temporally adjacent samples that followed. Stelmach and Hearty (1988) replotted Farrell's data and found that the number of successively presented samples that appeared to be simultaneously visible was proportional to the velocity of the time-sampled moving line. This was another way of stating Farrell's observation that visible persistence is proportional to the distance between samples. For example, let N be the number of samples perceived simultaneously, let p be the visible persistence of the first sample. The persistence hypothesis described" @default.
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• W2062202222 date "1988-05-01" @default.
• W2062202222 modified "2023-09-28" @default.
• W2062202222 title "Visible persistence is the result of spatiotemporal filtering: A reply to Stelmach and Hearty" @default.
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• W2062202222 doi "https://doi.org/10.3758/bf03207875" @default.
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