PSY 368 Human Memory. Sensory Memory. Structural Model. Memory composed of storage structures that hold memories for a period of time Sensory memory Short-term memory (STM) Long-term memory (LTM). Sensory Memory. Sensory memory Very short storage of info from senses Functions:
Video examples: 1 | 2 | 3 | 4
your iconic memory does this…
If I show you this….
K M D T
W B S R
(I have horn, drum, pong)
N V P A
W J U L
Signal to Brain
Equal Parts Red and Green =
(250 msec)Iconic Memory
Banks and Barber (1977)
Is info in iconic memory pre-categorical?
Von Wright (1972)
Used partial report method with different report criteria
Early view: stimulus persistence and information persistence were basically the same thing.
But more recent research suggests that:
Changes in Air Pressure
Acoustic information persistence lasts approx. 2 seconds -- unless a subsequent similar stimulus interferes with it.
When the subject reports the last item, it is still present in echoic memory.
In contrast, visual stimulus persistence doesn't last that long.
Capacity - limited only by amount of info that can be received by the perceptual system (e.g., eye, ear)
(2) Duration of memory:
- iconic - up to about 1 sec
- echoic - about 4 - 20 sec depending on type of info
(3) Type of info - mostly pre-processed, but some processing may occur after 250 - 300 ms