Visual STM Flashcards
Sperling (1960) showed that memories in the sensory register decay very rapidly i.e. within _ second. This was found using ___ & ___ report experiments
1, partial, whole
Name & describe 2 ways of testing STM capacity
The digit span test (how many digits can you repeat back to me?) = verbal STM. Corsi blocks test (how many tapped out locations can you tap back to me in order?) = spatial STM
Realise the relevance of several of these Q & As to MAIP, WM. Patient studies reveal a DD between verbal & visuospatial STM - explain & refer to the hemisphere in which the lesion resides
Patient KF (left parietal lesion): digit span of 2 but normal spatial span (& normal LTM). Patient ELD (RH lesion): impaired spatial span but normal digit span (& normal LTM)
The lesion data was supported by _ _ _ imaging data
PET
Baddeley & Hitch categorised the 3 levels of their WM model into 1), 2) & 3) from top (CE) to middle (phonological loop, episodic buffer & V-S sketchpad) to bottom (LT storage memory)
1) Top-down cognitive/executive control, 2) Fluid slave systems & 3) Cystallized systems
Owen (1999) conducted the same study as Blumenfield (2006) in your WM summary except that…(2 things)
1) PET was used instead of fMRI & 2) spatial span (maintenance only = recall locations in the correct order) vs. spatial N-back (manipulation too = recall the location N trials back) tasks were used
There is evidence to suggest that the VS sketchpad could be further fractionated into…
visuospatial & visual memory
What is the slot model of visual WM? How is it supported by Luck & Vogel’s (1997) data?
The slot model argues that visual WM has a fixed capacity of 3-4 slots of info. Successful performance in a change detection task (same or different?) when 3-4 items were displayed which then quickly diminished with 5+ items
The problem with Luck & Vogel’s argument that if info doesn’t get into a slot, it is not encoded at all and must be guessed about at test is that the change detection task…
cannot really tell us about the precision or quality of memories
Vogel (2001) argues that visual WM has a capacity of 3-4 fully bounded objects. TSB the finding that…
in the change detection task performance is very sensitive to the no. of objects (i.e. decreases with an increasing set size) but not to the type/ no. of features comprising each object e.g. whether an object is distinguished by its colour vs. orientation vs. a conjunction of features
In Bays & Husain’s (2008) study Pps were shown a display, followed by a target stimulus & were asked whether the target had…. As the no. of items in the display increased,…
Moved left or right or had been oriented clockwise or anticlockwise from when presented in the display. The precision of WMs decreased
In Bays & Hussain (2008) how was the precision of the memory calculated? How did this depict the finding?
By plotting a graph of displacement (in location) or rotation (of orientation) in degrees against the % of trials in which the target was judged to have moved or oriented e.g. clockwise. By showing a shallower curve as N (no. of items) increased = a courser, less refined WM
On the error graphs of Bays & Hussain’s (2008) study the finding is depicted by…
greater dispersion of the % of errors across degrees of displacement/ orientation rather than a focus at 0 degrees (as occurs when N is 1) where the task is most difficult
How do Bays & Husain’s (2008) refute the slot model?
By finding that the precision of WMs is degraded even when 2 rather than 1 pieces of info must be encoded.
WM precision is defined as 1/_ . When plotted logarithmically WM precision is found to be 1/
SD, N