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WMM (Baddeley and Hitch 1974) - Coggle Diagram
WMM (Baddeley and Hitch 1974)
Components
Central Executive - Directs attention to tasks. Limited capacity
Slave systems
Phonological loop
Episodic buffer
Visuo spatial sketchpad
Phonological loop
Phonological store - holds the word order
Articulatory control system - repeats words in your head
Research
Baddeley 1975
Pts recorded more short words than long words in serial order which shows that the capacity of the phonological loop is set by how long it takes to say words in your head rather than how many there are.
Approx. 2 items
Visuo spatial sketchpad
Visual cache - stores visual information
Inner scribe - deals with spatial relationships
Research
Baddeley and Hitch 1976
Pts tracking a moving point of light at the same time as describing the angles in a hollow letter. Others were performing a verbal task with the tracking light. The first group had difficulty as they were using two parts of the visuo spatial sketchpad at once whereas the second group were using two different stores and found it easier.
Approx 3-4 items
Episodic buffer
General store that integrates information from all areas
Extra storage system with limited capacity
Approx 4 chunks of information
Research
Alkhakifa 2009
Patient with severely impaired LTM demonstrated stm capacity of 25 items. Exceeds the capacity of PL and VSS so must need a buffer for it