Does silent reading speed in normal adult readers depend on early visual processes? evidence from event-related brain potentials

Little is known about the relationship of reading speed and early visual processes in normal readers. Here we examined the association of the early P1, N170 and late N1 component in visual event-related potentials (ERPs) with silent reading speed and a number of additional cognitive skills in a sample of 52 adult German readers utilizing a Lexical Decision Task (LDT) and a Face Decision Task (FDT). Amplitudes of the N170 component in the LDT but, interestingly, also in the FDT correlated with behavioral tests measuring silent reading speed. We suggest that reading speed performance can be at least partially accounted for by the extraction of essential structural information from visual stimuli, consisting of a domain-general and a domain-specific expertise-based portion.     

Internalism and Hyperexternalism About Reasons

Alan Goldman’s Reasons from Within is one of the most thorough recent defenses of what might be called ‘orthodox internalism’ about practical reasons. Goldman’s main target is an opposing view that includes a commitment to the following two theses: (O) that there are such things as objective values, and (E) that these values give rise to external reasons. One version of this view, which we can call ‘orthodox externalism’, also includes a commitment to the thesis (I) that rational people will be motivated by any reason they have of which they are aware. Goldman himself embraces (I), and deploys it frequently in his criticisms of orthodox externalism. But there is logical space for an externalist view that includes a commitment to (O) and (E), but that denies (I). The resulting “hyperexternalist” view holds that some reasons need not motivate us, even if we are rational. In this paper I argue that Goldman’s criticisms of orthodox externalism leave hyperexternalism untouched, and that his specific criticisms of my own version of hyperexternalism do not work. In light of Goldman’s criticisms of orthodox externalism and my own criticisms of Goldman’s view, hyperexternalism emerges as the favored option.     

Contrast effects in typicality judgements: A hierarchical Bayesian approach

We examine the influence of contrast categories on the internal graded membership structure of everyday concepts using computational models proposed in the artificial category learning tradition. In particular, the generalized context model (Nosofsky, 1986), which assumes that only members of a given category contribute to the typicality of a category member, is contrasted to the similarity-dissimilarity generalized context model (SD-GCM; Stewart & Brown, 2005), which assumes that members of other categories are also influential in determining typicality. The models are compared in a hierarchical Bayesian framework in their account of the typicality gradient of five animal categories and six artefact categories. For each target category, we consider all possible relevant contrast categories. Three separate issue are examined: (a) whether contrast effects can be found, (b) which categories are responsible for these effects, and (c) whether more than one category influences the typicality. Results indicate that the internal category structure is codetermined by dissimilarity towards potential contrast categories. In most cases, only a single contrast category contributed to the typicality. The present findings suggest that contrast effects might be more widespread than has previously been assumed. Further, they stress the importance of characteristics particular of everyday concepts, which require careful consideration when applying computational models of representation of the artificial category learning tradition to everyday concepts.     

The effect of observational learning on students’ performance,processes, and motivation in two creative domains

Background . Previous research has shown that observation can be effective for learning in various domains, for example, argumentative writing and mathematics. The question in this paper is whether observational learning can also be beneficial when learning to perform creative tasks in visual and verbal arts. Aims . We hypothesized that observation has a positive effect on performance, process, and motivation. We expected similarity in competence between the model and the observer to influence the effectiveness of observation. Sample . A total of 131 Dutch students (10^th grade, 15 years old) participated. Method . Two experiments were carried out (one for visual and one for verbal arts). Participants were randomly assigned to one of three conditions; two observational learning conditions and a control condition (learning by practising). The observational learning conditions differed in instructional focus (on the weaker or the more competent model of a pair to be observed). Results . We found positive effects of observation on creative products, creative processes, and motivation in the visual domain. In the verbal domain, observation seemed to affect the creative process, but not the other variables. The model similarity hypothesis was not confirmed. Conclusions . Results suggest that observation may foster learning in creative domains, especially in the visual arts.     

Color constancy and dispositionalism

This article attempts to do two things. The first is to make it plausible that any adequate dispositional view of color will have to associate colors with complex functions from a wide range of normal circumstances to a wide range of (simultaneously) incompatible color appearances, so that there will be no uniquely veridical appearance of any given color. The second is to show that once this move is made, dispositionalism is in a position to provide interesting answers to some of the most challenging objections that have been pressed against it. It explains why colors do not seem to “come on” when the lights come on, and why the right thing to say seems to be that the light causes the objects to reveal their colors. It explains why the content of visual experience need not be problematically circular. It eliminates the problem of intrapersonal variation in color appearance. And it even provides resources for dealing with the problem of interpersonal variation. It is true that in moving to the more complex view, the dispositionalist becomes subject to a new objection, which has been called “the problem of unity.” The paper offers a solution to this problem as well.     

Receiving the Gift of Teaching: From ‘Learning From’ to ‘Being Taught By’

This paper is an enquiry into the meaning of teaching. I argue that as a result of the influence of constructivist ideas about learning on education, teaching has become increasingly understood as the facilitation of learning rather than as a process where teachers have something to give to their students. The idea that teaching is immanent to learning goes back to the Socratic idea of teaching as a maieutic process, that is, as bringing out what is already there. Against the maieutic conception of teaching I argue for an understanding of teaching in terms of transcendence, where teaching brings something radically new to the student. I explore the meaning of the idea of transcendence through a discussion of Kierkegaard and Levinas, who both criticise the maieutic understanding of teaching and, instead, argue for a transcendent understanding of teaching—an understanding of teaching which they refer to as ‘revelation.’ Whereas Kierkegaard argues that revelation—which he understand as a process of ‘double truth giving’—lies beyond the power of the teacher, Levinas interprets revelation as the experience of ‘being taught.’ I use Levinas’s suggestion in order to explore the distinction between ‘learning from’ and ‘being taught by’ and argue that teaching has to be understood in the latter sense, that is, in terms of the experience of ‘being taught.’ To connect the idea of teaching to the experience of ‘being taught’ highlights that teaching can be understood as a process of ‘truth giving’ albeit that (1) this ‘gift’ lies beyond the powers of the teacher, and (2) the truth that is given, has to be understood in terms of what Kierkegaard calls ‘subjective truth’—which is not relativistic truth but existential truth, that is, truth that matters for one’s life. Understanding teaching in these terms also opens up new possibilities for understanding the role of authority in teaching. While my argument implies that teachers cannot simply and straightforwardly ‘produce’ the experience of ‘being taught’—so that what matters has to do with the conditions under which the gift of teaching can be received—their actions and activities nonetheless matter. In the final section of the paper I therefore argue that if we want to give teaching back to education, we need to resist the depiction of the teacher as a disposable and dispensable ‘resource’ that students can learn from or not, and need to articulate and enact a different story about the teacher, the student and the school.