scholarly journals The role of unique color changes and singletons in attention capture

2016 ◽  
Vol 78 (7) ◽  
pp. 1926-1934 ◽  
Author(s):  
Adrian von Mühlenen ◽  
Markus Conci
2011 ◽  
Vol 11 (11) ◽  
pp. 270-270
Author(s):  
A. von Muhlenen ◽  
M. Conci

2013 ◽  
Vol 76 (2) ◽  
pp. 508-518 ◽  
Author(s):  
Meera Mary Sunny ◽  
Adrian von Mühlenen
Keyword(s):  

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Kesavan Devarayan ◽  
Kopperundevi Sivakami Nagaraju ◽  
Padmavathi Pandiyan

Purpose The present study aims to describe the development of halochromic thin film sensors using mixed indicator dyes for monitoring the spoilage of packed seer fish. Design/methodology/approach Thin film was prepared using renewable polysaccharide incorporated with mixed indicator dyes. The thin film was characterized using ultraviolet visible and Fourier transform-infrared spectroscopy. The characteristics of the thin film were studied by analyzing the CIELAB and Red Green Blue values and biodegradability. The thin films were evaluated for real-time monitoring of the spoilage of packed seer fish. Findings The thin film sensors were found to exhibit excellent halochromism. The color changes were visible and distinguishable. The sensors responded efficiently for real-time monitoring of spoilage of fish by showing unique color changes. Originality/value This study provides promising mixed indicator that exhibits different colors in the alkaline pH. Also the present study reveals a potential combination of materials for preparation of halochromic sensors that can be used for monitoring the spoilage of packed seer fish in real time.


2021 ◽  
Vol 7 (27) ◽  
pp. eabg5381
Author(s):  
Katsuhiro Maeda ◽  
Daisuke Hirose ◽  
Mai Nozaki ◽  
Yoichi Shimizu ◽  
Taro Mori ◽  
...  

Chirality plays a key role in the physiological system, because molecular functionalities may drastically alter due to a change in chirality. We report herein a unique color indicator with a static helicity memory, which exhibits visible color changes in response to the chirality of chiral amines. A difference of less than 2% in the enantiomeric excess (ee) values causes a change in the absorption that is visible to the naked eyes. This was further quantified by digital photography by converting to RGB values. This system relies on the change in the tunable helical pitch of the π-conjugated polymer backbone in specific solvents and allows rapid on-site monitoring of chirality of nonracemic amines, including drugs, and the simultaneous quantitative determination of their ee values.


Author(s):  
Nan Yao ◽  
Wan Y. Shih ◽  
Daniel M. Dabbs ◽  
Ilhan A. Aksay

The synthesis of nanometer scale gold particles is well known historically. Stable and highly colored suspensions result from the reduction of gold cations in solution. But the formation of the gold particles is not monotonic, that is, the mechanism is not simply nucleation and growth. Rather, the pronounced color changes in the evolving suspension indicate that the mechanism is nucleation, aggregation, deaggregation, and growth. Until recently, the structure of the intermediate aggregate had been assumed to be an aggregation of primary particles, each 4-7 nm in diameter. HRTEM studies have shown that the intermediates are continuous ramified structures (Figure 1) which undergo a desintering process to form the final particles (~24-26 nm diameter). In this paper, we discuss a model which explains the role of the surfactant on the gold intermediate in the breakup of the intermediate structure.Gold colloids were prepared by reducing AuIIICl3 (aq) with sodium citrate as in previous studies:


2019 ◽  
Vol 31 (1) ◽  
pp. 36-48 ◽  
Author(s):  
Deborah Talmi ◽  
Martina Slapkova ◽  
Matthias J. Wieser

Signals for reward or punishment attract attention preferentially, a principle termed value-modulated attention capture (VMAC). The mechanisms that govern the allocation of attention can be described with a terminology that is more often applied to the control of overt behaviors, namely, the distinction between instrumental and Pavlovian control, and between model-free and model-based control. Although instrumental control of VMAC can be either model-free or model-based, it is not known whether Pavlovian control of VMAC can be model-based. To decide whether this is possible, we measured steady-state visual evoked potentials (SSVEPs) while 20 healthy adults took part in a novel task. During the learning stage, participants underwent aversive threat conditioning with two conditioned stimuli (CSs): one that predicted pain (CS+) and one that predicted safety (CS−). Instructions given before the test stage allowed participants to infer whether novel, ambiguous CSs (new_CS+/new_CS−) were threatening or safe. Correct inference required combining stored internal representations and new propositional information, the hallmark of model-based control. SSVEP amplitudes quantified the amount of attention allocated to novel CSs on their very first presentation, before they were ever reinforced. We found that SSVEPs were higher for new_CS+ than new_CS−. This result is potentially indicative of model-based Pavlovian control of VMAC, but additional controls are necessary to verify this conclusively. This result underlines the potential transformative role of information and inference in emotion regulation.


2011 ◽  
Vol 17 (1) ◽  
pp. 6
Author(s):  
A Del Casale ◽  
S Ferracuti ◽  
G D Kotzalidis ◽  
C Rapinesi ◽  
D Serata ◽  
...  

The perception of fear and subsequent appropriate behavioral responding are crucial for the adaptation of species to their living environment. Functional neuroimaging studies of the neural basis of fear during the last few decades in humans contributed to significant advancement in the understanding of its mechanisms. Imaging studies help us delineating the role of amygdala-based neurocircuitry in fear activation and attention capture. The aim of this paper was to briefly review the most recent functional neuroimaging studies of fear perception, modulation and learning. Important knowledge was acquired about the factors that set fear in motion, including the role of nonconscious processes and the character of fear in guiding attention. A subcortical network interacts with the prefrontal cortex to modulate emotional response that allows better coping with environmental and social circumstances. Fear learning reduces the need to relearn about danger, and flexibility processes readjust fear behavior when external circumstances change. Future improvement of functional and other neuroimaging techniques may promote better clarification of the neurocircuitry involved in fear perception, learning and modulation.


BioMetals ◽  
2011 ◽  
Vol 24 (6) ◽  
pp. 1005-1015 ◽  
Author(s):  
Henry D. Schreiber ◽  
Andrew H. Jones ◽  
Corinne M. Lariviere ◽  
Kelly M. Mayhew ◽  
Judith B. Cain

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