| |
Abstract:
The primary aim of this study was to determine processes
involved in retrievingstored information and in the utilisation or
manipulation of this information. We used a modified version of the
Sternberg paradigm (1966; Conway & Engle, 1994) with 3
different fixed sets and either no delay or a delay of 2s between
the presentation of cue and probe item.
Functional MR images were acquired at 3T (Bruker Medspec 30/100).
Imaging details were 14 slices (5mm thick, 2mm spacing), using
single shot, gradient recalled EPI (TE 46ms, TR 1700ms). Trials
were presented every 15 seconds with 24 trials per run with two
runs for delay and no delay. Strong activation was found in the
left inferior precentral sulcus and in the left posterior middle
frontal gyrus (F2p). Additionally, the intraparietal sulcus and
SMA/pre SMA were active bilaterally.These findings support a model
whereby premotor and left posterior prefrontal areas are involved
in articulatory scanning the sets and matching the cue to the probe
item, whereas the parietal cortex is involved in the phonological
storage andrepresentation of the sets.
|
