The Occipital Cortex in the Blind

ABSTRACT— Studying the brains of blind individuals provides a unique opportunity to investigate how the brain changes and adapts in response to afferent (input) and efferent (output) demands. We discuss evidence suggesting that regions of the brain normally associated with the processing of visual information undergo remarkable dynamic change in response to blindness. These neuroplastic changes implicate not only processing carried out by the remaining senses but also higher cognitive functions such as language and memory. A strong emphasis is placed on evidence obtained from advanced neuroimaging techniques that allow researchers to identify areas of human brain activity, as well as from lesion approaches (both reversible and irreversible) to address the functional relevance and role of these activated areas. A possible mechanism and conceptual framework for these physiological and behavioral changes is proposed.     

Quality of Life in Mexico: A Formative Measurement Approach

Improving quality of life for community members has become increasingly important for policy makers and society in general. This article presents the results from a representative sample of citizens from south-western Mexico. Because it is argued that quality of life indexes are formative rather than reflective, an advanced statistical method (partial least square) is used to analyze the data. The quality of life index used in the study includes the domains of health, income, work, education, safety, public services, non-governmental community services, social contact, and happiness. The results suggest that monetary-oriented indicators such as income and work are less important for respondents than domains such as happiness, social contact, or community services. However, for some of the domains, age and gender inequalities are observed.     

Response priming driven by local contrast, not subjective brightness

We demonstrate qualitative dissociations of brightness processing in visuomotor priming and conscious vision. Speeded keypress responses to the brighter of two luminance targets were performed in the presence of preceding dark and bright primes (clearly visible and flanking the targets) whose apparent brightness values were enhanced or attenuated by a visual illusion. Response times to the targets were greatly affected by consistent versus inconsistent arrangements of the primes, relative to the targets (response priming). Priming effects could systematically contradict subjective brightness matches, such that one prime could appear brighter than the other but could prime as if it were darker. Systematic variation of the illusion showed that response-priming effects depended only on local flanker-background contrast, not on the subjective appearance of the flankers. Our findings suggest that speeded motor responses, as opposed to conscious perceptual judgments, access an early phase of lightness and brightness processing prior to full lightness constancy.     

Teaching adults new words: the role of practice and consolidation

Semantic and orthographic learning of new words was investigated with the help of the picture-word interference (PWI) task. In this version of the Stroop task, picture naming is delayed by the simultaneous presentation of a semantically related as opposed to an unrelated distractor word (a specific PWI effect), as well as by an unrelated word compared with a nonword (a general PWI effect). This interference is taken to reflect automatic orthographic and semantic processing. The authors observed that participants showed both types of PWI effects for newly learned words following a single study session. Interestingly, specific PWI effects were not obtained immediately after testing but did emerge a week later without additional practice. This suggests that a period of consolidation is involved in the establishment of word representations. In addition, identical PWI effects were obtained when the study and test words were presented in either the same or different letter case. This provides evidence that the newly acquired orthographic representations are coded in an abstract format.     

“This way!”, “No! That way!”—3-year olds know that two people can have mutually incompatible desires

In theory of mind research, there is a long standing dispute about whether children come to understand the subjectivity of both desires and beliefs at the same time (around age 4), or whether there is an asymmetry such that desires are understood earlier. To address this issue, 3-year olds’ understanding of situations in which two persons have mutually incompatible desires was tested in two studies. Results revealed that (i) children were quite proficient at ascribing incompatible desires to two persons, and in simpler scenarios even incompatible desire-dependent emotions; (ii) children showed this proficiency even though they mostly failed the false belief task. Overall, these results suggest that there is an asymmetry such that young children come to understand the subjective nature of desires before they understand the corresponding subjectivity of beliefs. Possible explanations for this asymmetry are discussed in light of conceptual change and information-processing accounts of theory of mind development.     

Visual and haptic feedback contribute to tuning and online control during object manipulation

The authors employed a virtual environment to investigate how humans use haptic and visual feedback in a simple, rhythmic object-manipulation task. The authors hypothesized that feedback would help participants identify the appropriate resonant frequency and perform online control adjustments. The 1st test was whether sensory feedback is needed at all; the 2nd was whether the motor system combines visual and haptic feedback to improve performance. Task performance was quantified in terms of work performed on the virtual inertia, ability to identify the correct rhythm, and variability of movement. Strict feedforward control was found to be ineffective for this task, even when participants had previous knowledge of the rhythm. Participants (N = 11) performed far better when feedback was available (11 times more work, 2.2 times more precise frequency, 30% less variability; p < .05 for all 3 performance measures). Using sensory feedback, participants were able to rapidly identify 4 different spring-inertia systems without foreknowledge of the corresponding resonant frequencies. They performed over 20% more work with 24% less variability when provided with both visual and haptic feedback than they did with either feedback channel alone (p < .05), providing evidence that they integrated online sensory channels. Whereas feedforward control alone led to poor performance, feedback control led to fast tuning or calibration of control according to the resonant frequency of the object, and to better control of the rhythmic movement itself.     

Beyond the Conflict: Religion in the Public Sphere and Deliberative Democracy

Traditionally, liberals have confined religion to the sphere of the ‘private’ or ‘non-political’. However, recent debates over the place of religious symbols in public spaces, state financing of faith schools, and tax relief for religious organisations suggest that this distinction is not particularly useful in easing the tension between liberal commitments to equality on the one hand, and freedom of religion on the other. This article deals with one aspect of this debate, which concerns whether members of religious communities should receive exemptions from regulations that place a distinctively heavy burden on them. Drawing on Habermas’ understanding of churches as ‘communities of interpretation’, we explore possible alternatives to both the ‘rule-and-exemption’ approach and the ‘neutralist’ approach. Our proposal rests on the idea of mutual learning between secular and religious perspectives. On this interpretation, what is required is (i) the generation and maintenance of public spaces in which there could be discussion and dialogue about particular cases, and (ii) evaluation of whether the basic conditions of moral discourse are present in these spaces. Thus deliberation becomes a touchstone for the building of a shared democratic ethos.     

Latent state–trait theory: An application in sport psychology

ObjectiveQuestionnaires are often applied in sports psychology to measure a person's trait or state. However, the extent to which the questionnaire captures differences because of trait or state influences is often unclear. The latent state–trait (LST) theory offers the opportunity to separate both variance sources. This separation allows estimating specific reliability coefficients.DesignThe present paper gives a theoretical introduction to LST and its basic ideas. Using a real data set with N = 156 athletes we exemplify the steps necessary to derive the LST coefficients. All athletes filled out a comprehensive inventory assessing competitive anxiety on two occasions.MethodThe data are analysed with structural equation models based on LST principles.ResultsThe results confirm the questionnaire's trait saturation.ConclusionFinally, results are discussed in light of practical and theoretical implications.