Orange Bubbles

libertyboat.jpg
By: 
F. Lawrence

I remember my father taking me out to Montauk Point, Long Island at night, to watch the orange bubbles on the horizon. I found out later in life that the bubbles were German U-boats torpedoing Liberty ships. They wouldn't shut the lights off because they didn't want the citizens to feel like we were at war so any ship was like a sitting duck. I was about four or five.

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Subjects were presented with

Subjects were presented with a grid of 12 letters 70-235, arranged into three rows of four. After a brief presentation, subjects were then played either a high, medium or low tone, cuing them which of the rows to report. Based on these partial report experiments, Sperling was able to show that the capacity of sensory memory was approximately 12 items, but that it degraded very quickly (within a few hundred milliseconds). Because 70-236 this form of memory degrades so quickly, participants would see the display, but be unable to report all of the items (12 in the "whole report" procedure) before they decayed. This type of memory cannot be prolonged via rehearsal.

Sensory memory corresponds

Sensory memory corresponds approximately to the initial braindump 200–500 milliseconds after an item is perceived. The ability to look at an item, and remember what it looked like with just a second of observation, or memorisation, is an example of sensory memory. With very short presentations, participants often report that they seem to "see" more than they can actually report. The first experiments exploring this form of sensory 70-089 memory were conducted by George Sperling (1960) using the "partial report paradigm".

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