This article contains some errors that originated during the copy editing process.
The description of moderate compression speed on p. 2330 (Sec. I) contains an error; the statement should begin with “Moderate compression speeds on the order of tens of milliseconds could increase interactions.”
The description of the adaptive procedure on p. 2332 (Sec. II D) contains an error; the statement should read: “For three of these four digits, each pair of symmetric masker digits came from one of three fixed spatial separations: ±15°, ±30°, and ±90°.”