The earliest stages of visual processing take place in the primary and secondary visual cortical areas, often referred to simply as V1 and V2, which contain cells that respond to the simplest features of a scene, such as contrast between adjacent areas of the visual scene and the orientation of edges.
They are secondary visual areas in the sense that messages are relayed from area 17 to area 18 and from area 18 to area 19, and, because area 17 does not relay to regions beyond area 18, these circumstriate areas are the means whereby visual information is brought into relation with more remote parts of the cortex.
We used near infrared spectroscopy (NIRS) to investigate the vascular and metabolic response to brain activation in human primary and adjacent secondary visual cortex.
In secondary sensory areas, like the secondary visual cortex or the secondary somatosensory cortex, the maximum of IOSs amplitude was shifted to layer II/III.
The results from Experiments 1 3 clearly demonstrate that secondary visual information presented on a HUD interferes with the processing and completion of a concurrent visual task requiring selective attention.
The present FMRI findings confirmed the well-established pattern of prevalent activation of primary and secondary visual cortex in migraine with aura compared to patients without aura [18, 33].
Exploratory analyses revealed significant treatment differences in brain activity during the STIMEX on Day 28 in frontal lobe, caudate nucleus, middle temporal gyrus, secondary visual cortex, and supramarginal gyrus.
Although problems were presented in auditory format, activity was detected for both reasoning and maintenance in a network comprising bilaterally the secondary visual cortex, the posterior cingulate cortex, and the medial anterior frontal cortex.
Even lowering thresholds to liberal levels did not reveal any significant clusters in primary or secondary visual cortex.
We identified three main findings: (1) Photic sneezers generally demonstrated stronger intracerebral activations compared with controls within the primary and secondary visual cortex.
Whether the enhanced activation in the primary and secondary visual cortices in response to visual stimuli could be explained by enhanced attentional processes is controversial.
