2 research outputs found
The Neural Responses of Visual Complexity in the Oddball Paradigm: An ERP Study
This research measured human neural responses to images of different visual complexity levels using the oddball paradigm to explore the neurocognitive responses of complexity perception in visual processing. In the task, 24 participants (12 females) were required to react to images with high complexity for all stimuli. We hypothesized that high-complexity stimuli would induce early visual and attentional processing effects and may elicit the visual mismatch negativity responses and the emergence of error-related negativity. Our results showed that the amplitude of P1 and N1 were unaffected by complexity in the early visual processing. Under the target stimuli, both N2 and P3b components were reported, suggesting that the N2 component was sensitive to the complexity deviation, and the attentional processing related to complexity may be derived from the occipital zone according to the feature of the P3b component. In addition, compared with the low-complexity stimulus, the high-complexity stimulus aroused a larger amplitude of the visual mismatch negativity. The detected error negativity (Ne) component reflected the error detection of the participants’ mismatch between visual complexity and psychological expectations
Simple Strategy Generating Hydrothermally Stable Core–Shell Platinum Catalysts with Tunable Distribution of Acid Sites
There are critical needs for platinum
catalysts with high hydrothermal
stability and tunable Pt–acid site proximity, which could not
be achieved via traditional methods. Here, we describe a simple strategy
(SiO<sub>2</sub> alumination combined with controlled removal of the
capping agent) through which Pt-based core–shell catalysts
that tolerant both high-temperature steam and boiling water can be
obtained. More importantly, this strategy allows precise control of
the distance between acid sites and Pt; thus, the interfacial electronic
interaction can be cut off without prohibiting the spillover of adsorbed
species. This tunable structure not only helps to unravel the mechanism
of C<sub>3</sub>H<sub>8</sub> oxidation over acidic Pt catalyst but
also increases the N<sub>2</sub> selectivity for NO<sub><i>x</i></sub> selective catalytic reduction. Given that the component of
both the “core” and “shell” can be changed
easily, this strategy should have wide application in mechanism exploration
as well as the development of catalysts for various reactions