Two dissociable updating processes in working memory sex dating in rockdell virginia

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Results from two types of trials are detailed in this report: () Nonrecent Negative trials, in which the probe matched items from neither the current nor the two previous target sets.We hypothesized that a correct response to a Recent Negative probe would engage interference resolution processes, possibly inhibition of the tendency to respond “yes” based on the sheer familiarity of the probe (which had been rehearsed extensively on the two previous trials).This imaging finding, and the corresponding behavioral finding of increased reaction times in PI conditions, was attributed to the effects of inhibitory processing or some other conflict resolution process mediated by ventrolateral PFC.

Importantly, the PI-related activity reported in (6) also could have reflected a state-dependent mental “set” that persisted steadily during blocks of trials that featured high stimulus overlap, as might be expected if subjects adopted a different behavioral strategy for blocks that featured a high proportion of stimulus overlap across trials.The arrows along the time line represent the placement of independent variables positioned to detect variance in the f MRI signal associated with target presentation, delay period, and probe portions of the trial, respectively.Seven right-handed subjects (age 19–24) were recruited from the medical and undergraduate campuses of the University of Pennsylvania.Research on the prefrontal cortex (PFC) of monkeys and humans indicates that this region supports a heterogeneous repertoire of mental processes that contribute to many complex behaviors, such as working memory.Anatomical evidence for some of these processes derives from functional neuroimaging experiments using blocked experimental designs, which average signal across all components of many trials and therefore cannot dissociate distinct processes with different time courses.

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