Expected performance at the human/computer interface as a function of user proficiency and system power

How do managers expect the proficiency of users and the power of the computers to determine overall performance? Five different models are proposed: (a) a matching model in which optimal performance is achieved when the power of the system is judged to be compatible with the proficiency of the user, (b) an averaging model in which expected performance is the average of the values of user proficiency and system power, (c) a multiplying model in which performance is the product of the values of user proficiency and system power, (d) a human/computer ratio model in which performance is determined by the ratio of system power over total effort, and (e) a computer/human ratio model in which performance is determined by the ratio of user proficiency over total effort. The applicability of these models was assessed by having managers and students of management predict performance in human/computer systems from information about the user's proficiency with computers and the power of the system. Participants rated 16 combinations of user proficiency and system power from a 4 × 4 factorial design. The pattern of ratings indicated that 51 per cent used a multiplying model and 25 percent used an averaging model; whereas, only 6 percent used the matching model and 4 percent used a ratio model. The remaining 14 percent did not follow any model clearly. Implications of these results were discussed for the design of the human/ computer interface, training and selection of users, and the cost-benefit tradeoffs for investment in user training versus equipment acquisition.     

品牌印象研究述评

品牌印象是消费者基于对品牌信息的感知和体验而在头脑中留下的品牌部分或整体信息。品牌印象形成涉及到类别信息加工和个别化信息加工两方面,其认知加工模式还存在争议。品牌印象实证研究主要存在以品牌主观形象为核心的品牌印象研究和以品牌拟人化特征为焦点的品牌印象研究两条线路。在分析比较的基础上,我们认为无论是品牌形象研究线路还是品牌人格研究线路,探讨的都是品牌的客观特性在消费者头脑中留下的主观印象,其本质都是对消费者品牌印象的研究。品牌印象是品牌与消费者的关系基础。品牌建设的任务就是在深刻把握消费者品牌印象形成机制的基础上,通过调节和控制消费者对品牌的认知、联想、态度、信任和忠诚来积累品牌资产。     

Myopic loss aversion: Demystifying the key factors influencing decision problem framing

Advancement of myopic loss aversion theory has been hamstrung by conflicting results, methodological inconsistencies, and a piecemeal approach toward understanding the key factors influencing decision problem framing. A series of controlled experiments provides a more holistic view of the variables promoting myopia. Extending the information horizon promotes broad framing, which propels risk. Evaluation frequency and decision frequency interact regardless of information horizon, supporting the notion that restricting either mechanism alleviates myopia. When conducting evaluations infrequently, neither segregating nor aggregating retrospective returns significantly alters risk preferences. Moreover, students and real retirement plan participants exhibit comparable appetites for risk, implying that both groups frame decision problems similarly. Explanations for these findings and avenues for future research are discussed.     

Good friendships,bad friends: Friendship factors as moderators of the relation between aggression and social information processing

The primary objective was to examine whether the associations between aggression and social information processing was moderated by friendship quality and the aggressiveness of the best friend. Drawn from a larger normative sample of 5th and 6th graders, 385 children (180 boys) completed questionnaires pertaining to friendship quality and social information processing. Friendship and peer nominations of behaviours were collected. Results revealed positive associations between aggressive behaviour and the endorsement of aggressive coping strategies in cases where the protagonist was an unfamiliar peer. However, one important exception emerged: no significant associations between aggression and aggressive coping were revealed for children with high-quality friendships with aggressive peers. In cases where the protagonist was the best friend, there was a significant relation between aggression and vengeful coping, but only for those participants who had a low-quality friendship with an aggressive friend.     

Contrast constancy revisited: The perceived contrast of sinusoidal gratings above threshold

The contrast sensitivity function of the human visual system, measured with sinusoidal luminance gratings, has an inverted U shape with a peak around 2–4?c/deg. Above threshold, it is thought that luminance gratings of equal physical contrasts but of distinguishably different spatial frequencies are all perceived as having similar contrasts, a phenomenon that has been termed contrast constancy. However, when suprathreshold contrast matches were measured for pairs of luminance gratings whose spatial frequencies were indistinguishable, the matching curves were not flat and followed a similar inverted U shape form as the contrast sensitivity function at threshold. It was therefore suggested that contrast constancy may only be revealed when matching the contrasts of clearly distinguishable spatial frequencies. Here, observers matched the perceived contrasts of suprathreshold luminance gratings of similar but visibly different spatial frequencies between 0.25 and 16?c/deg. The results show that, much like the contrast sensitivity function at threshold, observers are more sensitive to intermediate spatial frequencies (1–6?c/deg) than they are to either higher or to lower spatial frequencies. This tuning is evident when matching reference contrasts of 30–80%, implying a significant role in everyday vision. To demonstrate that these results were not due to local adaptation, the experiment was repeated with shorter stimulus duration, producing the same results. The extent of departure from contrast constancy found in the present study is compared to previously reported suprathreshold measurements. The results are also discussed with consideration to limitations with display apparatus such as monitor blur.     

Cybersemiotics and the Question of Semiotic and Informational Thresholds

The present article discusses various suggestions for a philosophical framework for a transdisciplinary information science or a semiotic doctrine. These are: the mechanical materialistic, the pan-informational, the Luhmanian second order cybernetic approach, Peircian biosemiotics and finally the pan-semiotic approach. The limitations of each are analyzed. The conclusion is that we will not have to choose between either a cybernetic-informational or a semiotic approach. A combination of a Peircian-based biosemiotics with autopoiesis theory, second order cybernetics and information science is suggested in a five-leveled cybersemiotic framework. The five levels are 1) a level of Firstness, 2) a level of mechanical matter, energy and force as Secondness, 3) a cybernetic and thermodynamic level of information and signal, 4) a level of sign games in living systems, and 5) a level of conscious language games in self-conscious social humans.     

Consciousness,Vorticity, and Dipoles

As spin is a fundamental feature of the universe, preliminary evidence suggests that its study could help in understanding consciousness. Research detailed in this article further develops the author's work in Keen (2005) Keen, J. 2005. Consciousness, intent, and the structure of the universe, Canada: Trafford. Available at http://www.trafford.com/robots/04-2320.html [Google Scholar]. The findings demonstrate that rotating objects generate fields that are also associated with mind-generated fields. Numerous quantitative properties of these fields generated by rotation are shown to be very different to fields associated with static objects. Dipole antenna radiation patterns are also discovered. The conclusions suggest that vorticity is not only involved in consciousness, but also has wider implications in understanding our universe, and therefore the subject warrants further research.     

Biased attention and dysphoria: Manipulating selective attention reduces subsequent depressive symptoms

Selective attention for dysphoric stimuli has been observed in individuals with depression and those at risk for depression. To date, no studies have investigated the effects of directly manipulating selective attention for dysphoric stimuli on depressive symptoms. Mild to moderately depressed college students (N=34) were randomly assigned to complete 4 sessions of either attention training (AT) or no training (NT) during a two-week period. Participants completed self-reported assessments of depressive symptoms at baseline, post-training, and follow-up. Participants in the AT condition had a significantly greater decrease in depressive symptoms from baseline to follow-up than participants in the NT condition. This group difference was mediated by change in attention bias. Our findings suggest that biased attention may have a causal role in the maintenance of depressive symptoms.     

Neurobiological correlates of cognitions in fear and anxiety: A cognitive–neurobiological information-processing model

We review likely neurobiological substrates of cognitions related to fear and anxiety. Cognitive processes are linked to abnormal early activity reflecting hypervigilance in subcortical networks involving the amygdala, hippocampus, and insular cortex, and later recruitment of cortical regulatory resources, including activation of the anterior cingulate cortex and prefrontal cortex to implement avoidant response strategies. Based on this evidence, we present a cognitive–neurobiological information-processing model of fear and anxiety, linking distinct brain structures to specific stages of information processing of perceived threat.