PSYCH485 Lecture Notes - Visual Cortex, Echoic Memory, Iconic Memory
3 Jan 2013
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Not aware only when presented briefly. Have sensory memory for every modality 2 main: iconic (visual) and echoic (auditory) Iconic memory iconic memory sensory memory that holds brief visual image of scene that has just been perceived; also known as visible persistence. Sperling presented visual images through tachistoscope at rate of 9 letters on screen for 50 milliseconds. On average, person could remember 4 or 5 but insisted that for brief time could see more but images faded to fast to see all. Also used partial report procedure to determine whether capacity of iconic memory accounted for this limitation. Asked people to name letters in only one horizontal row indicated by a tone after letters disappeared. Able to repeat letters with perfect accuracy iconic memory had capacity for all 9. If delay of tone was longer than 1 second people could onyl relay 50% Could not recall all 9 because had faded from memory.
