Conscious, preconscious, and subliminal processing: a testable taxonomy

Of the many brain events evoked by a visual stimulus, which are specifically associated with conscious perception, and which merely reflect non-conscious processing? Several recent neuroimaging studies have contrasted conscious and non-conscious visual processing, but their results appear inconsistent. Some support a correlation of conscious perception with early occipital events, others with late parieto-frontal activity. Here we attempt to make sense of these dissenting results. On the basis of the global neuronal workspace hypothesis, we propose a taxonomy that distinguishes between vigilance and access to conscious report, as well as between subliminal, preconscious and conscious processing. We suggest that these distinctions map onto different neural mechanisms, and that conscious perception is systematically associated with surges of parieto-frontal activity causing top-down amplification.     

Judging the urgency of nonvocal auditory warning signals: perceptual and cognitive processes

Previous research has identified acoustic properties modulating the perceived urgency of alarms. The authors conducted 3 experiments using a multidimensional approach in which participants made acoustic dissimilarity judgments and urgency dissimilarity judgments for pairs of sequences. Experiment 1 confirmed the validity of acoustic parameters in urgency perception of experimental alarms. Experiment 2 confirmed the role of these acoustic parameters with real alarms but suggested the importance of additional factors. Experiment 3 compared the relative degrees of urgency of alarms from Experiments 1 and 2, highlighting the role of both sequence structure and associated mental representation. The authors conclude that the design of alarms should not be based exclusively on acoustic factors but should also take into consideration the acquisition of an appropriate mental representation.     

Racism in higher education in South Africa: A challenge to student counsellors

The repeal of apartheid legislation applied to education presents new challenges to student counsellors. Given the history of racial conflict that accompanied limited desegregation on campuses in South Africa, one can expect that conflict ivill increase now that any student may freely study at any university. Of necessity, counsellors will need to develop new expertise to deal with conflict arising from racism on campus. Counselling centres will also have to reflect the diversity of the student population, which will require changed university employment policies.     

Acetaminophen effects on behavioral thermoregulation in albino rats

Acetaminophen (N-Acetyl-p-aminophenol) was administered intraperitoneally to 15 Sprague-Dawley rats partitioned into 3 studies (5 rats per study) using a within subjects, repeated-measures reversal design. Behavioral thermoregulation was assessed in a cold Skinner Box using 5-sec. exposures of microwave radiation [Specific Absorption Rate = 0.34 Watts/kg/(mW/cm2)] as reinforcing stimuli under a fixed-interval 2-min. schedule of positive reinforcement. Doses of 10, 20, 30, 40, and 50 mg/kg (in solutions of 1%, 2%, 3%, 4%, and 5%) acetaminophen showed stable rates of operant responding for heat compared with significant changes in rates for comparable doses of aspirin in a 1993 study by Vitulli, et al. Weight reductions and temperature increases varied significantly with before-session and after-session measures, respectively. 1994-95 biochemical data of Murphy, et al. from humans following aspirin or acetaminophen ingestion which affect thermoregulation and sleep patterns are discussed in conjunction with behavioral data from rats.     

Androgyny and sex-typing: Differences in beliefs regarding gender polarity in ratings of ideal men and women

To test Bem's (1979) hypothesis that androgynous and sex-typed individuals are differentiated by the presence or absence of beliefs in “gender polarity,” 200 students rated themselves on the short Bem Sex Role Inventory (BSRI). Of these 200, 20 androgynous women, 20 androgynous men, 20 feminine sex-typed women, and 20 masculine sex-typed men were randomly selected and asked to rate either the ideal woman or the ideal man on the short BSRI. As predicted, androgynous women did not rate the ideal man and woman differently, but, contrary to prediction, neither did feminine-typed women. As predicted, masculine-typed men rated the ideal man and woman differently, but, contrary to prediction, so did androgynous men. Thus, sex rather than sex-role distinguished subjects' beliefs in gender polarity. This finding may reflect women's desires for, and men's fears of, abandoning traditional modes of sex differentiation. The large initial subject pool was necessary because an extremely high percentage of subjects were classified as feminine sex-typed. An apparent feminine bias in the short BSRI is discussed.     

Learning 10000 pictures

Four experiments are reported which examined memory capacity and retrieval speed for pictures and for words. Single-trial learning tasks were employed throughout, with memory performance assessed by forced-choice recognition, recall measures or choice reaction-time tasks. The main experimental findings were: (1) memory capacity, as a function of the amount of material presented, follows a general power law with a characteristic exponent for each task; (2) pictorial material obeys this power law and shows an overall superiority to verbal material. The capacity of recognition memory for pictures is almost limitless, when measured under appropriate conditions; (3) when the recognition task is made harder by using more alternatives, memory capacity stays constant and the superiority of pictures is maintained; (4) picture memory also exceeds verbal memory in terms of verbal recall; comparable recognition/recall ratios are obtained for pictures, words and nonsense syllables; (5) verbal memory shows a higher retrieval speed than picture memory, as inferred from reaction-time measures. Both types of material obey a power law, when reaction-time is measured for various sizes of learning set, and both show very rapid rates of memory search.

From a consideration of the experimental results and other data it is concluded that the superiority of the pictorial mode in recognition and free recall learning tasks is well established and cannot be attributed to methodological artifact.     

Engineering Social Justice into Traffic Control for Self-Driving Vehicles?

The convergence of computing, sensing, and communication technology will soon permit large-scale deployment of self-driving vehicles. This will in turn permit a radical transformation of traffic control technology. This paper makes a case for the importance of addressing questions of social justice in this transformation, and sketches a preliminary framework for doing so. We explain how new forms of traffic control technology have potential implications for several dimensions of social justice, including safety, sustainability, privacy, efficiency, and equal access. Our central focus is on efficiency and equal access as desiderata for traffic control design. We explain the limitations of conventional traffic control in meeting these desiderata, and sketch a preliminary vision for a next-generation traffic control tailored to address better the demands of social justice. One component of this vision is cooperative, hierarchically distributed self-organization among vehicles. Another component of this vision is a priority system enabling selection of priority levels by the user for each vehicle trip in the network, based on the supporting structure of non-monetary credits.     

Εὐφραινέσθωσαν οἱ οὐρανοί, ‘Let the heavens rejoice’: an Anglican reflection on the 2014 Agreed Statement on Christology between the Anglican Communion and the Oriental Orthodox Churches

After acknowledging the importance of the Anglican–Oriental Orthodox Agreed Statement on Christology (2014) and explaining the perspective of this article, the rationale of Christology as confession and interpretation is explained and explored: its development of the fundamental theme of Christ the eternal Son, by his double solidarity in incarnation with humanity and Godhead relating and re-bonding Godhead and humanity. This theme, inherent in Peter’s confession of Jesus as Messiah, is essentially repeated by Paul and continuously interpreted in the Church’s unfolding self-understanding. Criticism of this process is mentioned and briefly countered. The continuity of the theme in the debates of the fourth and fifth centuries, its basis in principles of human relevance and divine commitment and its adequate expression in the Statement are indicated and affirmed. The prudent silence of the Agreement on technical refinements and definitions of Councils is noted. Finally, brief suggestions are offered in explanation of the continuance of the issue in ancient times and reflections on its relevance to modern Christology.