Age-related changes in amplitude,latency and specialization of ERP responses to faces and watches

ABSTRACT

Healthy aging is associated with impairments in face recognition. While earlier research suggests that these impairments arise during memory retrieval, more recent findings suggest that earlier mechanisms, at the perceptual stage, may also be at play. However, results are often inconsistent and very few studies have included a non-face control stimulus to facilitate interpretation of results with respect to the implication of specialized face mechanisms vs. general cognitive factors. To address these issues, P100, N170 and P200 event-related potentials (ERPs) were measured during processing of faces and watches. For faces, age-related differences were found for P100, N170 and P200 ERPs. For watches, age-related differences were found for N170 and P200 ERPs. Older adults showed less selective and less lateralized N170 responses to faces, suggesting that ERPs can detect age-related de-differentiation of specialized face networks. We conclude that age-related impairments in face recognition arise in part from difficulties in the earliest perceptual stages of visual information processing. A working model is presented based on coarse-to-fine analysis of visually similar exemplars.     

A Gricean Interpretation of Nāgārjuna’s Catuṣkoṭi and the No-Thesis View

Nāgārjuna (c. 150–250 CE), the famous founder of the Madhyamika School, proposed the positive catu?ko?i in his seminal work, Mūlamadhyamakakārikā: ‘All is real, or all is unreal, all is both real and unreal, all is neither unreal nor real; this is the graded teaching of the Buddha’. He also proposed the negative catu?ko?i: ‘“It is empty” is not to be said, nor “It is non-empty,” nor that it is both, nor that it is neither; [“empty”] is said only for the sake of instruction’ and the no-thesis view: ‘No dharma whatsoever was ever taught by the Buddha to anyone’. In this essay, I adopt Gricean pragmatics to explain the positive and negative catu?ko?i and the no-thesis view proposed by Nāgārjuna in a way that does not violate classical logic. For Nāgārjuna, all statements are false as long as the hearer understands them within a reified conceptual scheme, according to which (a) substance is a basic categorical concept; (b) substances have svabhāva, and (c) names and sentences have svabhāva.     

Knowledge Justice: An Opportunity for Counter-expertise in Security vs. Science Debates

ABSTRACT

Knowledge justice provides a conceptual framework to apply principles of social justice in environments of competing interests regarding science. Both knowledge and its making can be seen as a good to be distributed, including all voices for whom the science will matter. In this framework, knowledge production is shared among a broader constituency of knowers representing both local and cosmopolitan voices. The problem of knowledge injustice can be seen in the U.S. government’s recent attempt to secure scientific knowledge about H5N1 or avian bird flu virus. The censorship produced a global debate between scientists and policy-makers over how to balance the nation-state’s desire for security with the life science’s tradition of open and shared research. This conundrum, known as the dual-use dilemma, obscures larger questions that lie outside of expert-centered domains—namely the concerns of many communities in the Global South struggling with the impact of the virus in their daily lives. An example of such counter-expertise is that of the backyard poultry farmer whose ways of knowing are foreign to science and policy experts who frame the ways in which knowledge about H5N1 should be developed, controlled, and used. While the H5N1 debate illuminated competing positions regarding knowledge production between powerful elites, it ignored the social justice inequities produced by the dual-use dilemma. The concept of knowledge justice provides a way of thinking about science that can include locally situated counter-expertise, disrupting the dual-use dilemma produced by competing dominant priorities of security and public health.     

Decision theory and artificial intelligence II: The hungry monkey

This paper describes a problem-solving framework In which aspects of mathematical decision theory are incorporated into symbolic problem-solving techniques currently predominant in artificial intelligence. The utility function of decision theory IS used to reveal tradeoffs among competing strategies for achieving various goals, taking into account such factors as reliability, the complexity of steps in the strategy, and the value of the goal. The utility function on strategies can therefore be used as a guide when searching for good strategies. It is also used to formulate solutions to the problems of how to acquire a world model, how much planning effort is worthwhile, and whether verification tests should be performed. These techniques are illustrated by application to the classic monkey and bananas problem.     

情绪研究中的一种整体观——弗里达群集理论述评

情绪的激起是情绪心理学中一个基本的问题。对这一问题 ,前人有很多的争议。在对前人观点进行概述的基础上 ,重点介绍了美国情绪心理学家弗里达 (Frjida ,N .H)的“情绪是由群集引发的”这一观点 ,并认为他用一种整体的观点来看待情绪的激起 ,对以后的情绪研究有一定的启示意义。     

A dissociation of right and left hemispheric effects for recognizing emotional tone and verbal content

Emotionally intoned sentences (happy, sad, angry, and neutral voices) were dichotically paired with monotone sentences. A left ear advantage was found for recognizing emotional intonation, while a simultaneous right ear advantage was found for recognizing the verbal content of the sentences. The results indicate a right hemispheric superiority in recognizing emotional stimuli. These findings are most reasonably attributed to differential lateralization of emotional functions, rather than to subject strategy effects. No evidence was found to support a hypothesis that each hemisphere is involved in processing different types of emotion.     

Using targeted visceroception to improve interoceptive sensibility and emotion regulation

Focusing on one's body can improve the awareness and regulation of emotion. Interoception – sensing the physiological condition of the body, particularly of the viscera – appears to play an important role. While the majority of previous research studies have examined interoceptive sensitivity (i.e., detection of objectively measurable physiological changes), there has been relatively limited investigation of interoceptive sensibility (i.e., subjective awareness of those changes), and even fewer studies permitting causal conclusions. The current study is part of a randomised controlled trial on visceroception in the context of emotion regulation, using an 8-week intervention involving focused attention on either cardiac or gastrointestinal activity. Group differences in emotion regulation and reactivity were assessed using the Multidimensional Assessment of Interoceptive Awareness (MAIA), the Difficulties in Emotion Regulation Scale, and the Emotion Reactivity Scale (ERS). The findings suggest that focussed attention on gastrointestinal activity (i.e., gastroception), in particular, improves interoceptive sensibility and emotion regulation, as evidenced by increases on the MAIA's Noticing, Body Listening, and Self-regulation subscales, and decreases on the Arousal subscale of the ERS. Gastroception may make distinct contributions to the benefits of body focus in a research context where the gut is often overlooked.