The cerebral representation of space: insights from functional imaging data

Functional imaging techniques, such as positron emission tomography and functional magnetic resonance imaging, present a unique opportunity to examine, in humans, the cerebral representation of space in vivo. Space is ubiquitous and not a unitary phenomenon, and the brain uses visual, vestibular and proprioceptive inputs to produce multiple representations of space subserving spatial cognition, ranging from gaze control to remembering multiple complex large-scale environments. Functional imaging studies have shown the importance of the parietal cortex in perceptual, motor, attention and working memory aspects of body-centred human spatial cognition. Functional imaging has also revealed pathways in humans homologous to those found in monkeys for the separate processing of spatial location and object identity. There are further suggestions of similar differentiation in working memory. The importance of the medial temporal region in the recall of spatial location has been confirmed also and novel virtual reality paradigms are now providing insights into the cerebral representation of spatially-extended large-scale environments. We still have much to learn about the cerebral representation of space in the human brain and functional brain imaging, in concert with patient studies and animal models, will allow us to continue investigating.     

The retrosplenial contribution to human navigation: a review of lesion and neuroimaging findings

The clinical and neuroimaging literatures are surveyed in order to collate for the first time the available data on retrosplenial involvement in human navigation. Several notable features emerge from consideration of the case reports of relatively pure topographical disorientation in the presence of a retrosplenial lesion. The majority of cases follow damage to the right retrosplenial cortex, with Brodmann's area 30 apparently compromised in most cases. All patients displayed impaired learning of new routes, and defective navigation in familiar environments complaining they could not use preserved landmark recognition to aid orientation. The deficit generally resolved within eight weeks of onset. The majority of functional neuroimaging studies involving navigation or orientation in large-scale space also activate the retrosplenial cortex, usually bilaterally, with good concordance in the locations of the voxel of peak activation across studies, again with Brodmann's area 30 featuring prominently. While there is strong evidence for right medial temporal lobe involvement in navigation, it now seems that the inputs the hippocampus and related structures receive from and convey to right retrosplenial cortex have a similar spatial preference, while the left medial temporal and left retrosplenial cortices seem primarily concerned with more general aspects of episodic memory.     

Inhibitory control gains from higher-order cognitive strategy training

The present study examined the transfer of higher-order cognitive strategy training to inhibitory control. Middle school students enrolled in a comprehension- and reasoning-focused cognitive strategy training program and passive controls participated. The training program taught students a set of steps for inferring essential gist or themes from materials. Both before and after training or a comparable duration in the case of the passive controls, participants completed a semantically cued Go/No-Go task that was designed to assess the effects of depth of semantic processing on response inhibition and components of event-related potentials (ERP) related to response inhibition. Depth of semantic processing was manipulated by varying the level of semantic categorization required for response selection and inhibition. The SMART-trained group showed inhibitory control gains and changes in fronto-central P3 ERP amplitudes on inhibition trials; whereas, the control group did not. The results provide evidence of the transfer of higher-order cognitive strategy training to inhibitory control and modulation of ERPs associated with semantically cued inhibitory control. The findings are discussed in terms of implications for cognitive strategy training, models of cognitive abilities, and education.     

The differential effect of noise on creative task performance

The effect of an arousal manipulation on creativity task performance was investigated. Sixty, 80, and 100dB of noise were used to raise arousal levels in 72 undergraduates while they were individually assessed on creativity tasks. Two hypotheses were tested: The first was that noise would interfere with performance on creativity tasks, and the second was that high scorers would be resistant to this effect. Results supported the latter hypothesis. The noise‐induction appeared to have a differential effect. For highly original subjects, there was a curvilinear relationship between the noise and performance; this relationship was not reflected in the performance of subjects who scored low in originality. The major finding of this study was that research on the relationship between creativity and arousal may be difficult and misleading if the mediating role of individual differences in creativity are not considered.     

Counselling effectiveness: A critical discussion

Studies of counselling effectiveness are examined critically with respect to the measures they use, their methodological weaknesses, and problems of interpretation. The deficiencies of various measuring devices — including unstructured accounts, structured questionnaires, pre- and post-counselling ratings, physiological indicators, experimental investigations, and social actions effects — are discussed. Many of the experiments are criticised for poor design and over-interpretation of findings. Fundamental methodological problems are also discussed, including the extent to which the effectiveness of counselling can appropriately be examined by existing scientific methods. More knowledge of counselling processes is required before there can be any satisfactory measurement of counselling effects.     

The function of academic and non-academic criteria in employers' selection strategies

The different ways in which employers use educational qualifications and non-academic criteria in their recruitment and selection of young people are explored. Five different types of selection strategy are identified, each of which is characterised by a different balance between the use of academic and non-academic criteria. After a consideration of the functions that educational qualifications perform in the different strategies, the nonacademic criteria are examined in more detail. The paper concludes with an examination of the implications of these findings for careers guidance.