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Neural Encoding Correlates of High and Low Verbal Memory Performance
Ist Teil von
Journal of psychophysiology, 2006-01, Vol.20 (2), p.68-78
Ort / Verlag
Hogrefe & Huber Publishers
Erscheinungsjahr
2006
Link zum Volltext
Quelle
EBSCOhost APA PsycARTICLES
Beschreibungen/Notizen
Neuroimaging studies have indicated
involvement of left prefrontal cortex and temporal areas in verbal memory
processes. The current study used event-related functional neuroimaging
to compare encoding of subsequently recalled and not recalled words in high and
low memory performers. Fifteen healthy volunteers were given lists of words to
learn with immediate recall and to read as a control condition. High performers
reported to have visualized the words whereas low performers used a rehearsal
strategy. Compared to reading, unsuccessful encoding was associated with
thalamic and left premotor area (BA 6) activity. Comparing
successful with unsuccessful learning yielded widespread activity of the left
prefrontal and posterior temporal gyrus as well as the left superior parietal
lobe in the whole group. Low performers showed activation of the left premotor
area throughout learning and additionally of the left middle temporal and
parahippocampal gyrus during successful encoding. High performers showed
increased activation in the extrastriate cortex throughout learning and
additionally in the left parietal post- and paracentral areas as well as
in the right precuneus during successful encoding. The results suggest that
high verbal memory performance is the result of spatiovisual activation
concomitant to imagery and low performance of hippocampal and motor activation,
the latter being associated with rehearsal, with a common memory circuit
subserving both groups.