Properties of the diffuse thalamocortical system and human personality: A direct test of Pavlovian/Eysenckian theory

Advances in the last few decades demonstrate the relevance of Pavlov's classification of behavioural types with respect to human individual differences and suggest that the hypothetical excitatory and inhibitory processes which he associated with these differences correspond to cortical and thalamic neuron populations of the diffuse thalamocortical system (DTS). Since the transmission properties or time constants of these DTS elements would correspond to the Pavlovian property of ‘strength’, and since they can be evaluated in human subjects (Robinson, 1981), it is possible to formulate hypotheses based on the fundamental principles of strength and balance which Pavlov employed to provide a causal explanation for temperamental types. A major finding is that covariation of the time constants equated with strength correlates 0.95 with covariation of extraversion and stability scores on the Eysenck Personality Questionnaire (EPQ). This result provides unequivocal support for the relationship between human individual differences and properties of the nervous system postulated by Pavlov and it also confirms the neurophysiological underpinning of Eysenck's influential theory of human personality. In addition, the relationship between Pavlovian and Eysenckian concepts is clarified and EEG parameters are meaningfully related to personality differences.     

Intrinsic Qualities of Experience: Surviving Harman's Critique

Gilbert Harman (1990) seeks to defend psychophysical functionalism by articulating a representationalist view of the qualities of experience. The negative side of the present paper argues that the resources of this representationalist view are insufficient to ground the evident distinction between perception and (mere) thought. This failure makes the view unable to support the uses to which Harman wishes to put it. Several rescuing moves by other representationalists are considered, but none is found successful. Part of the difficulty in Harman's work is that he does not adequately specify the view he rejects. The positive aim of the present paper is to provide a robust intrinsic quality account of experience that offers advantages in comparison with Harman's view, and that plainly does not fall to any of the arguments he advances. This revised version was published online in July 2006 with corrections to the Cover Date.     

Global Spatial Organization by Individuals with Williams Syndrome

Williams syndrome is a genetically determined disorder with a characteristic cognitive profile. Overall IQ tends to be lower than in the normally developing population, performance on measures of linguistic ability is somewhat higher than would be expected given the levels of IQ typical for this group, and there is a particular weakness in visuospatial construction (e.g., block design tasks). A well-known hypothesis about the deficit in visuospatial construction is that people with Williams syndrome are strongly inclined to be local spatial processors. We report a test of this hypothesis that used a visual search task sensitive to spontaneous global spatial organization. A sample of adults with Williams syndrome produced a pattern of data demonstrating that they spontaneously organize spatial displays at a global level. Indeed, individuals with Williams syndrome found it more difficult to change from global to local processing than participants with normal intelligence. We suggest that the primary problem with visuospatial construction in people with Williams syndrome is not in the salience of single levels of organization but rather in the difficulty of changing between organizations.     

Adjusting to Retirement: Considerations for Counselors

The purpose of this article is to examine retirement while focusing on issues older adults face in adjusting to retirement and to suggest implications for counseling people who are making this transition.     

A DEVELOPMENTAL-GENETIC ANALYSIS OF CONTINUITY AND CHANGE IN THE BAYLEY MENTAL DEVELOPMENT INDEX FROM 14 TO 24 MONTHS:

Abstract— A developmental-genetic model was fitted to Bayley Mental Development Index (MDI) data to address questions concerning the origins of individual differences in MDI performance and the origins of change and continuity during infancy More than 350 pairs of identical and same-sex fraternal twins were studied longitudinally at 14, 20, and 24 months of age There was substantial genetic continuity of general cognitive ability from 14 to 24 months but significant new genetic variation also appeared at 24 months Shared family environmental influences were global across all three ages and not time-specific Finally, nonshared environmental influences did not contribute to the observed continuity of general cognitive ability, only to change.     

The EEG and intelligence: An appraisal of methods and theories

Formerly, attempts were made to discover some relationship between intelligence differences and measures of “spontaneous” EEG activity. More recently the focus of interest has shifted to a putative relationship between intelligence differences and differences in EEG responses evoked by sensory stimulation. This article identifies serious conceptual and methodological problems of the EEG-intelligence literature which render some EEG-intelligence theories untenable. It is concluded that the “cerebral arousability” theory of EEG-intelligence relations is the only one that can account for the physical, neurological and psychological facts while addressing the main issues that have dominated the whole field of intelligence research for the past 100 years.     

CROSS-RACIAL IDENTIFICATION OF TRANSFORMED,UNTRANSFORMED, AND MIXED-RACE FACES*

Many studies report that people of one race find other-race faces difficult to remember. The generality of this observation was tested by examining the recognition memory of 2 groups of European (n = 32), and African (n = 32) subjects on same-race, other-race, and mixed-race faces, which were either transformed or untransformed in pose between initial study and recognition test. A mixed-design ANOVA (2-between × 1-within factors), using the Signal Detection Theory measures of discrimination accuracy (d′) revealed the following: (1) a significant interaction between Race of Subject × Race of Face, with Europeans being more accurate than Africans at identifying untransformed white faces, and Africans also better than Europeans in identifying transformed black faces; (2) a significant interaction between Transformation × Race of Subject, in that while Europeans were significantly more accurate than Africans on untransformed faces as a whole, Africans were slightly superior to Europeans in terms of accuracy on transformed faces; (3) untransformed faces were recognised better than transformed faces; (4) there were no significant main effects due either to Race of Subject or to Race of Face; (5) no significant differences were found between the 2 groups on accuracy for either transformed or untransformed mixed-race faces; (6) no significant interaction between Race of Face × Transformation, and no significant 3-way interaction between Race of Subject × Race of Face × Transformation. It was concluded that differences in ‘race’ as a variable alone may not be responsible for the differences usually found on accuracy in cross-race eyewitness identifications. Rather, differences in levels of task difficulty and individual differences in recognition strategies adopted by subjects irrespective of race of stimulus face, may be the most important variables. The implications of these results for the efficient design of cross-race identification tasks for both forensic and training purposes were discussed.     

Children's attributions for Peers' positive behaviors: Social status differences

The purpose of this study was to investigate differences between aggressive-rejected and nonaggressive-cooperative boys in their attributions for peers'positive behaviors. In individual interviews, 27 aggressive-rejected and 27 nonaggressive-accepted boys were presented with 10 vignettes and a real-life situation in which a peer's action resulted in a favorable outcome for another peer or for the subject. Subjects' attributions for the peer's behavior were elicited with open-ended probes. Analysis of variance indicated that the groups did not differ in their tendency to infer positive intentions in the hypothetical story condition. In the real-life situation, aggressive-rejected boys were less likely to infer positive intentionality than were the nonaggressive-accepted boys. Boys' responses across the two conditions (hypothetical and real life) were moderately consistent.     

Family work with victims and offenders in a secure unit

Two examples of family therapy in a secure unit for violent mentally ill offenders are described. The model used incorporated ideas from reparation schemes for victims and offenders in addition to an emphasis on the circumstances of the offence.     

Flickering the W-Defense

One way to defend the Principle of Alternative Possibilities (PAP) against Frankfurt-style cases is to challenge the claim that agents in these scenarios are genuinely morally responsible for what they do. Alternatively, one can grant that agents are morally responsible for what they do in these cases but resist the idea that they could not have done otherwise. This latter strategy is known as the flicker defense of PAP. In an argument he calls the W-Defense, David Widerker adopts the former approach. I argue that, while Widerker's argument does a poor job showing that these agents are not morally responsible for what they do, it does a very good job highlighting the alternative possibilities that remain open to agents in these cases and illustrating their moral significance (or robustness). In doing so, my aim is to co-opt Widerker's argument to bolster the most promising versions of the flicker defense.