Relationships between redundancy analysis,canonical correlation,and multivariate regression

This paper attempts to clarify the nature of redundancy analysis and its relationships to canonical correlation and multivariate multiple linear regression. Stewart and Love introduced redundancy analysis to provide non-symmetric measures of the dependence of one set of variables on the other, as channeled through the canonical variates. Van den Wollenberg derived sets of variates which directly maximize the between set redundancy. Multivariate multiple linear regression on component scores (such as principal components) is considered. The problem is extended to include an orthogonal rotation of the components. The solution is shown to be identical to van den Wollenberg's maximum redundancy solution.This research was supported in part by U.S. Environmental Protection Agency contract 68-02-3402. The author gratefully acknowledges the stimulation of Maurice Tatsuoka and Beth Dawson-Saunders in first interesting him in redundancy analysis, as well as a useful change suggested by Warren Sarle.     

Reliability of headache diagnosis

The literature on diagnosis of head pain associated with psychological factors indicates that these diagnoses rely almost exclusively on self-report criteria. The reliability of self-report criteria for diagnosis of headache has not been previously reported. The present study investigated the reliability of headache diagnosis based on the criteria suggested by the Ad Hoc Committee on Classification of Headache. The results indicated modest rater agreement. It was concluded that the headache literature may be confounded by unreliable diagnostic procedures. Improved methods of classifying headache types using self-report, behavioral, and physiological measures during pain-free and headache states are required before adequate reliability of headache classification can be achieved. It is suggested that reliable and valid measurement and classification would eliminate much of the confusion currently existing in the headache literature.     

The strain of guardianship for men in the United States

This study examined the extent to which control, commitment, and support influenced the strain experienced among men in the U.S. who were acting as guardians for aged adults, an atypical role for such men. A total of 146 male guardians responded to a questionnaire. Results of the study showed that control and commitment were associated with less strain, whereas the use of formal support systems was related to greater levels of strain. Additionally, strain was found to be less prevalent among older guardians.     

A System for Relational Reasoning in Human Prefrontal Cortex

The integration of multiple relations between mental representations is critical for higher level cognition. For both deductive- and inductive-reasoning tasks, patients with prefrontal damage exhibited a selective and catastrophic deficit in the integration of relations, whereas patients with anterior temporal lobe damage, matched for overall IQ but with intact prefrontal cortex, exhibited normal relational integration. In contrast, prefrontal patients performed more accurately than temporal patients on tests of both episodic memory and semantic knowledge. These double dissociations suggest that integration of relations is a specific source of cognitive complexity for which intact prefrontal cortex is essential. The integration of relations may be the fundamental common factor linking the diverse abilities that depend on prefrontal function, such as planning, problem solving, and fluid intelligence.     

The time course of phonological, semantic, and orthographic coding in reading: Evidence from the fast-priming technique

The present experiment employed the fast-priming paradigm in reading (Sereno & Rayner, 1992), in which sentences are silently read while eye-movement-contingent changes are made on a specified target region. In this paradigm, when readers fixate on a specified target word region, a prime word is encountered for a brief duration at the beginning of the fixation and then it is replaced by a target word. Three types of primes were employed:homophones, semantically related, andorthographically similar, and five prime durations were employed: 29, 32, 35, 38, and 41 msec. The primary finding was that significant homophone priming was obtained at prime durations ranging from 29 to 35 msec, whereas significant semantic priming occurred only at the 32-msec prime duration. In contrast, significant orthographic priming occurred at all prime durations. These findings indicate that phonological codes are activated during an eye fixation at least as rapidly as semantic codes. An explanation for the pattern of events is suggested using the framework of an activation-verification model.     

Socialization toward a career as a marriage and family therapist: How is our profession doing?

To date, marriage and family therapy does not have formal socialization programs at the undergraduate level. Socialization activities may include career classes, advising, providing internships, or actively recruiting the most talented and qualified students. These socialization activities may also aid in the recruitment of minority students. A survey of the accredited programs revealed that most programs do not have formal opportunities for the faculty to interact and discuss therapy as a career option. While most programs have at least one faculty member who teaches undergraduates, this contact alone is not very good in terms of socializing students into choosing therapy as a career option. While there are some valid concerns about undergraduates, marriage and family therapy as a distinct discipline may benefit from actively recruiting the best students.     

Chronic effects of high salt intake and conflict stress on blood pressure in primates

The effects of combined behavioral stress and high dietary salt on blood pressure were examined in baboons (N=4) over the course of 1 year. Either high salt diet (240 mEq Na⁺/day) or conflict stress were administered for 8 to 16 weeks, followed by high salt intake and stress combined. Mean arterial pressure (MAP) increased by 8 mmHg during high dietary salt alone, by 4 mmHg during stress alone, and increased further to 14 mmHg above baseline during combined salt and stress. Control baboons (N=2) had no change in MAP across 47 weeks. The data indicate additive effects of chronic high dietary salt intake and behavioral stress on blood pressure in non-human primates.