Cookies on this website
We use cookies to ensure that we give you the best experience on our website. If you click 'Continue' we'll assume that you are happy to receive all cookies and you won't see this message again. Click 'Find out more' for information on how to change your cookie settings.

Evidence from primates suggests that prefrontal and parietal regions selectively represent information that is relevant for current behavior. In humans, whilst functional imaging has shown that fronto-parietal areas are activated by a range of different cognitive demands, the actual content of representation remains unclear. The current report describes two studies designed to address this issue using fMRI adaptation. In both studies, participants completed a delayed matching task where they attended to either the color or the shape of a series of sample stimuli and indicated whether occasional test stimuli matched the preceding sample on the attended dimension. Whole brain contrasts showed that changes to the value of the currently attended dimension produced significantly greater responses in frontal and parietal areas than events where the value was repeated. In addition, prefrontal and parietal regions of interest showed strong interactions between the currently attended dimension and the type of stimulus change, reflecting an attentional modulation of responses to stimulus change. Further comparisons suggested that the differences between attended changes and stimulus repetitions carried information about specific stimulus values, and did not simply reflect a generic response to attended changes.

Original publication

DOI

10.1016/j.neuroimage.2009.06.066

Type

Journal article

Journal

Neuroimage

Publication Date

01/11/2009

Volume

48

Pages

436 - 448

Keywords

Adaptation, Psychological, Adult, Analysis of Variance, Attention, Brain, Brain Mapping, Female, Frontal Lobe, Humans, Magnetic Resonance Imaging, Male, Neuropsychological Tests, Parietal Lobe, Photic Stimulation, Task Performance and Analysis, Time Factors, Young Adult