THE VISUAL SYSTEM'S MEASUREMENT OF INVARIANTS NEED NOT ITSELF BE INVARIANT

Abstract— When two shapes that differ in orientation or size have to be compared or objects have to be recognized from different viewpoints, the response time and error rate art systematically affected by the size of the geometric difference. In this report, we argue that these effects are not necessarily solid evidence for the use of mental transformations and against the use of invariants by the visual system. We report an experiment in which observers were asked to give affine-invariant coordinates of a point located in an affine frame defined by three other points. The angle subtended by the coordinate axes and the ratio of the lengths of their unit vectors systematically affected the measurement errors. This finding demonstrates that the visual system's measurement of invariants need not itself be invariant.     

Employment rejection and acceptance letters and their unintended consequences on image,self-concept,and intentions

This paper demonstrates that the positiveness and negativeness of letters of acceptance and rejection from companies have an impact on company image, self-concept of recipient, and reported future intentions of potential recruits. The implication for employers writing letters of acceptance and rejection is that they should communicate with prospective recruits in a positive manner no matter what the letter's message. Positive rejection letters can mitigate effects of rejection and negative acceptance letters can impair the positiveness of acceptance.This research was partially supported by Grant #82037 from the Purdue Agricultural Research Station. Reprints should be addressed to Dr. Richard Feinberg, Department of Consumer Sciences and Retailing, Purdue University, 1262 Matthews Hall, West Lafayette, IN 47907-1262.     

Comparison of simultaneous prompting with and without error correction in teaching science vocabulary words to high school students with mild disabilities

This study compared the effectiveness and efficiency of simultaneous prompting with and without error correction during daily probe sessions in teaching science vocabulary words. The teacher presented the vocabulary word definitions as instructive feedback during training sessions. Five 16–17 year old students with disabilities participated in an adapted alternating treatments design that evaluated the simultaneous prompting strategy, error correction and instructive feedback. Instruction occurred in a group format using choral responding. The results indicate that (a) all students learned to read the vocabulary words, (b) simultaneous prompting with error correction was slightly more efficient for three of the five subjects in learning the targeted words, and four of the five students made fewer errors in this condition, (c) all students preferred simultaneous prompting with error correction over simultaneous prompting without error correction, (d) words mastered in both conditions generalized equally, (e) there were minimal differences between the two conditions in the collected maintenance data, and (e) students experienced only minimal improvement in their ability to define vocabulary words (instructive feedback). Discussion focuses on issues for further research and implications for instructional practice with simultaneous prompting, error correction and instructive feedback.     

Spiritualists,Aliens and UFOs: Extraterrestrials as spirit guides

One of the most striking innovations within contemporary North American Spiritualism is the adoption of extraterrestrials as spirit guides by some contemporary Spiritualists. It is here that the New Age fascination with extraterrestrials and UFOs has taken on a uniquely Spiritualist form. Extraterrestrials have come to represent for many Spiritualists the successful achievement of the ultimate Spiritualist goal: the union between spirituality and science. Extraterrestrials are seen as spiritually superior to us because their science exceeds our own; their ‘science’ is perceived superior because it incorporates recognition of spiritual ‘truth’. Consequently, within the North American Spiritualist context, the adoption of extraterrestrials as spirit guides can be seen both as a ‘rationalisation’ of Spiritualist belief through a strong idealisation of ‘science’, and as a critique of orthodox science for ignoring the ‘spiritual’ realm. For several of the Spiritualists with whom I worked, extraterrestrials have consequently become excellent choices for spirit guides.     

Counseling and screening for cystic fibrosis in patients with congenital bilateral absence of the vas deferens: Patient perceptions

Congenital bilateral absence of the vas deferens (CBAVD) occurs in approximately 1.3% of infertile males and is thought to be, in most cases, a primarily genital form of cystic fibrosis (CF). Fourteen males with CBAVD considering microsurgical sperm aspiration from the epididymis (MESA) and in vitro fertilization were seen for genetic counseling and screening for CF. To retrospectively evaluate these patients' perceptions of the counseling and screening information, we conducted structured telephone interviews to assess their recall of information about CF and its impact on their health concerns and reproductive plans. We found that, as the health implications of CF are abstract and not as important to patients as the diagnosis of CBAVD itself, patients tend to view their CF status primarily in terms of their reproductive potential. Retrospective analysis afforded us an opportunity to identify the psychosocial issues of most concern to this unique patient population.     

Philosophy of medicine in the Netherlands

This report explores the relationship between philosophy and medicine in the Netherlands. In Section 1 we outline the ups and downs of medico-philosophical research in our country: pre-war flourishing, post-war decline, and modern renaissance. In Section 2 we review recent Dutch literature in the philosophy of medicine. The topics dealt with include methodology of medical science, alternative medicine, the basic concepts of medicine, anthropological medicine, medicalization, medicine and culture, and health care ethics.     

Reinforcing effects of prerecorded words and delayed speech feedback on the verbal behavior of a neologistic schizophrenic

The possibility of using prerecorded words and 2-sec. delayed speech feedback as reinforcement in the reconditioning of intelligible verbal responses in a chronic, neologistic schizophrenic patient was investigated. A test situation was devised which involved daily presentation of 100 stimulus word-picture cards to elicit verbal responses. The results indicated that both singly presented prerecorded words and delayed speech feedback apparently strengthened correct and intelligible verbal responding.