Table 3.

Overview of the sub-tests (capacity STM-types/substructures) included in the STM capacity measurement instrument.

Test	Capacity STM-type (substructures)	Designation	Description of capacity measurement
1	Progressive visual-iconic	PCvi	Successive increase in the number of simultaneous visual stimuli (figurer)
2	Progressiv visuell-verbal	PCvv	Successive increase in the number of simultaneous verbal stimuli (two-phoneme words)
3	Visual-iconic capacity picture	MCviP	A detailed realistic image (photograph) followed by statements (true/false) about details in the image to be remembered
4	Visual-iconic multi capacity figure	MCviF	A collection of simple figures is displayed at the same time and must be remembered
5	Visual-verbal capacity	MCvvR	A collection of two-phoneme words appears simultaneously and must be remembered
6	Visual sensoric capacity	SCvi	Successive increase in the number of simultaneous visual stimuli (figures) appears briefly (1–2 s)
7	Verbal sensoric capacity	SCvv	Successive increase in the number of simultaneous verbal stimuli (two-phoneme words) appears briefly (1–2 s)
8	Non-verbal intelligence (extract)	Raven (RAPM)	Raven matrices with increasing degree of difficulty is shown and the next logical pattern will be identified among several possibilities during the given viewing time per matrix