We used an interference paradigm to investigate whether attention is attribute-specific at early levels of visual processing. We show that the peripheral increment thresholds for luminance contrast deteriorate when the observer is currently performing another luminance (form or contrast) discrimination task in central view, but not when he or she is performing a color discrimination task. Similar results were obtained for color increment thresholds, indicating that the interference is specific to contrast Basket Nike Blazer Mid modality. The effects are strong and robust over primary task difficulties and perceptual learning levels. Modeling suggests that attention improves contrast sensitivity by modulating the gain of the neuronal response to contrast. These results suggest that attention is parceled in independent resources for luminance and color contrast.
This paper presents a reconstruction of the former coastal estuaries of the Quarteira and Carcavai estuaries in southern Portugal based on sedimentological, geochemical and palynological analyses of Holocene sediment cores. The results show that each Basket Blazer Nike Pas Cher estuary developed differently, depending on the morphology of the palaeovalley, environmental conditions and especially the influence of the sea and the formation of barrier systems. Both Blazer Nike Pas Cher estuaries were flooded between 7000 and 5500 cal BP by sea level rise and were almost completely filled by sediment by the beginning of the Roman occupation (226 BC/2176 cal BP). A clear change in sedimentological processes is evident in both estuaries between 5500 and 3000 cal BP and is interpreted as an erosion phase or evidence of high-energy events such as storms or tsunamis.
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