Missing piece of the puzzle in the science of consciousness: Resting state and endogenous correlates of consciousness

Consciousness still stands as one of the most interesting and the most elusive problems of neuroscience. Finding its correlates is the first step toward its satisfactory explanation. Several theories have proposed its correlates but none of them seem to be generally accepted even though most of them share some very similar elements. These elements are the activity of the thalamus, which is considered by some as the central region for consciousness, and gamma synchronization, which should be the general principal for the emergence of conscious experience. However, all of these proposed theories share one characteristic and that is that they do not take into consideration the recently discovered endogenous activity of the brain, which is generally associated with the default mode network. Although the activity of this large scale brain network is in correlation with various levels of consciousness it is still missing in discussions of consciousness. This review recognizes the importance of endogenous activity and points out the important discoveries of endogenous activity that could be an important step toward a satisfactory explanation of consciousness.     

The levels of perceptual processing and the neural correlates of increasing subjective visibility

According to the levels-of-processing hypothesis, transitions from unconscious to conscious perception may depend on stimulus processing level, with more gradual changes for low-level stimuli and more dichotomous changes for high-level stimuli. In an event-related fMRI study we explored this hypothesis using a visual backward masking procedure. Task requirements manipulated level of processing. Participants reported the magnitude of the target digit in the high-level task, its color in the low-level task, and rated subjective visibility of stimuli using the Perceptual Awareness Scale. Intermediate stimulus visibility was reported more frequently in the low-level task, confirming prior behavioral results. Visible targets recruited insulo-fronto-parietal regions in both tasks. Task effects were observed in visual areas, with higher activity in the low-level task across all visibility levels. Thus, the influence of level of processing on conscious perception may be mediated by attentional modulation of activity in regions representing features of consciously experienced stimuli.     

说明文阅读中因果推理的意识性

采用独立记得-知道范式(IRK)和加工分离范式(PDP)探讨说明文阅读中因果推理的意识性。根据关系部分的描述与目标句是否存在逻辑冲突,创设推理成功和推理失败两种实验条件。实验1和2分别使用独立记得-知道范式和加工分离范式进行研究。两个实验的结果都发现推理成功和推理失败在有意识和无意识加工指标上都差异显著,表明说明文阅读中因果推理既影响有意识加工也影响无意识加工,该结果支持和完善了文本阅读双加工理论。     

成年女性情景自传体记忆的现象学体验：年龄与时间的作用

目的：考察成年女性情景自传体记忆(EAM)的现象学体验是否受年龄和事件发生时间的影响。方法：95名老、中、青年女性被试详细回述童年及近一年的自传体事件各一件,并完成自传体记忆问卷。结果：所有被试在近期记忆的大多数体验得分上显著高于童年期记忆,年龄主效应及交互作用不显著。在近期记忆的情绪体验上,中、老年女性比青年女性更积极。结论：成年女性EAM的现象学体验受时间影响明显,受年龄影响不大;中、老年女性的EAM现象学体验表现出一定的积极情绪偏向。     

连贯阅读中文本表征的意识性研究

采用独立记得-知道范式(IRK)和加工分离范式(PDP)探讨连贯阅读中文本表征的意识性问题。实验1使用独立记得-知道范式(IRK),分析被试对再认项目判断为“记得”或“知道”的比例（击中率）;实验2使用加工分离范式(PDP),分析被试在包含、排斥测验中的击中率和虚报率。总的实验结果表明,在连贯阅读中,命题表征的建构是无意识的,情境模型的建构也是无意识的,该结果支持和完善了文本阅读双加工理论。     

道德本能与道德判断

Human beings’ moral life can be divided into two forms, one based on moral instincts and the other on moral judgments. The former is carried on without deliberation, while the latter relies upon valuations and judgments. The two can ultimately be viewed as man’s innate moral nature and acquired moral conventions. Theoretically, preference for the former will lead to naturalism and for the latter to culturalism, but this is the reality of man’s moral life. Moreover, there may be a parallel relation between the moral structure of human life and the grammatical structure of human language. Translated by Yu Xin from Zhexue yanjiu 哲学研究 (Philosophical Researches), 2007, (12): 72–78     

Analytical psychology and Daoist inner alchemy: a response to C.G. Jung's 'Commentary on The Secret of the Golden Flower'

Abstract :  This paper provides a historical, religious-philosophical context for the study of the Daoist text known as  The Secret of the Golden Flower . An updated study is conducted into the controversy over the source of the text including the editions translated by Richard Wilhelm and Thomas Cleary. The main teachings of the text and the basics of two major denominations of Daoism are introduced to ground later critiques of Jung's commentary. The psychodynamics of analytical psychology, especially those concerned with integration of unconscious contents and the realization of the self (individuation) are compared with the psycho-spiritual dynamics of integration in Eastern spirituality based on the Golden Flower text. The paper concludes that it was amiss for Jung to have equated the Western 'unconscious' with states of higher consciousness in Eastern meditation practices, although his claim that Eastern higher consciousness is characterized by a nebulous state of non-intentionality does raise questions about the appropriateness of calling Eastern meditative states 'consciousness'. A new concept is required to characterize the special qualities of this psychic state shared generally by Eastern spiritual traditions and a more meaningful comparison may be found in Jung's concept of the self.     

A theory of consciousness

Consciousness is the subjective awareness of momentary experience interpreted in the context of personal memory and present state. I propose that two brain systems converge to create consciousness. The exogenous system sends information about multimodal external stimuli to basal dendrites in widely dispersed pyramidal cell ensembles in the cortex of the brain; this system produces synchronized fragments of sensations. The endogenous system distributes readout of representations of memories, activated in systems established by associative learning, diffusely to apical dendrites. Convergence of exogenous and endogenous inputs enhances cellular excitability, and fragmented sensations are thereby converted to fragments of perception. Local field potentials periodically modulate all cortical membrane potentials and facilitate synchronous discharge of these excited elements. Feedback between the cortex and the thalamus results in a cortico-thalamo-cortical reverberation, binding the fragments into a unified global percept. Sustained reverberation produces a resonating electromagnetic field of synchronized elements. The momentary content of information in the brain is this distributed coherence, which is negative entropy. Consciousness is a physical property of this field, producing the subjective awareness of this information.     

Brain Science and the Biology of Belief: A Theological Response

Exploration of brain pathways involved in religious experience has been the focus of research by Andrew Newberg and colleagues. Although the import of this work sheds new light on the human capacity to experience divine reality, the theological implications drawn from this research are vague and lack an appropriate methodology to provide critical distinctions. This paper offers a theological response to Newberg's work by highlighting several aspects of this research including the relationship between theological judgments and empirical observations, the uniqueness of human transcendence, and the appropriateness of measuring mystical experience.     

Stigma Consciousness in Intergroup Contexts: The Power of Conviction

People vary in the extent to which they expect to be stereotyped, and these differences in “stigma consciousness” have cognitive and behavioral consequences that contribute to people's experience of stereotyping, prejudice, and discrimination (20). Here it is argued that high levels of stigma consciousness also have significant interpersonal consequences. Consistent with this claim, female participants who were high in stigma consciousness acted critically toward male participants whom they believed to be sexist. Moreover, these critical behaviors elicited unfavorable responses from the male participants, responses which then provided fodder for the women's belief that they would not like the men. The results are discussed in light of previous work on the target's perspective on stereotyping and call into question the wisdom of adopting a vigilant stance when interacting with out-group members.