ABSTRACT
Within the visual cortex, stimuli compete for neural representation. Simultaneously presented visual stimuli suppress each other's neuronal representation in striate and extrastriate visual areas. Frontoparietal systems may not only enhance responses to task-relevant stimuli, but also suppress responses to emotional stimuli. This is accompanied by suppression of the amygdala. The dorsal premotor cortex is important for the selection between individual, specific responses that are arbitrarily associated with stimuli. The dorsal premotor cortex was activated in an fMRI study when subjects selected left or right manual responses to visual stimuli in accordance with a rule set. The lateral posterior parietal cortex contains the inferior and superior parietal lobules. The inferior parietal lobule projects predominantly to the dorsolateral prefrontal cortex but also to the dorsal premotor cortex, whereas the superior parietal lobule projects mainly to the dorsal premotor cortex.
