Saccadic eye movements as indicators of cognitive function in older adults

Older adults appear to have greater difficulty ignoring distractions during day-to-day activities than younger adults. To assess these effects of age, the ability of adults aged between 50 and 80 years to ignore distracting stimuli was measured using the antisaccade and oculomotor capture tasks. In the antisaccade task, observers are instructed to look away from a visual cue, whereas in the oculomotor capture task, observers are instructed to look toward a colored singleton in the presence of a concurrent onset distractor. Index scores of the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS) were compared with capture errors, and with prosaccade errors on the antisaccade task. A higher percentage of capture errors were made on the oculomotor capture tasks by the older members of the cohort compared to the younger members. There was a weak relationship between the attention index and capture errors, but the visuospatial/constructional index was the strongest predictor of prosaccade error rate in the antisaccade task. The saccade reaction times (SRTs) of correct initial saccades in the oculomotor capture task were poorly correlated with age, and with the neurospsychological tests, but prosaccade SRTs in both tasks moderately correlated with antisaccade error rate. These results were interpreted in terms of a competitive integration (or race) model. Any variable that reduces the strength of the top-down neural signal to produce a voluntary saccade, or that increases saccade speed, will enhance the likelihood that a reflexive saccade to a stimulus with an abrupt onset will occur.     

Episodic future thinking: Linking neuropsychological performance with episodic detail in young and old adults

Episodic future thinking (EFT) has been linked with our ability to remember past events. However, its specific neurocognitive subprocesses have remained elusive. In Experiment 1, a study of healthy older adults was conducted to investigate the candidate subprocesses of EFT. Participants completed a standard EFT cue word task, two memory measures (Verbal Paired Associates I, Source Memory), and two measures of executive function (Trail Making Test, Tower Test). In Experiment 2, healthy young adults also completed an EFT task and neuropsychological measures. The link between neurocognitive measures and five characteristics of EFT was investigated. Specifically, it was found that Source Memory and Trail Making Test performance predicted the episodic specificity of future events in older but not younger adults. Replicating previous findings, older adults produced future events with greater semantic but fewer episodic details than did young adults. These results extend the data and emphasize the importance of the multiple subprocesses underlying EFT.     

The impact of working memory load on task execution and online plan adjustment during multitasking in a virtual environment

Three experiments investigated the impact of working memory load on online plan adjustment during a test of multitasking in young, nonexpert, adult participants. Multitasking was assessed using the Edinburgh Virtual Errands Test (EVET). Participants were asked to memorize either good or poor plans for performing multiple errands and were assessed both on task completion and on the extent to which they modified their plans during EVET performance. EVET was performed twice, with and without a secondary task loading a component of working memory. In Experiment 1, articulatory suppression was used to load the phonological loop. In Experiment 2, oral random generation was used to load executive functions. In Experiment 3, spatial working memory was loaded with an auditory spatial localization task. EVET performance for both good- and poor-planning groups was disrupted by random generation and sound localization, but not by articulatory suppression. Additionally, people given a poor plan were able to overcome this initial disadvantage by modifying their plans online. It was concluded that, in addition to executive functions, multiple errands performance draws heavily on spatial, but not verbal, working memory resources but can be successfully completed on the basis of modifying plans online, despite a secondary task load.     

Influence analysis of structural equation models with polytomous variables

The estimation of model parameters in structural equation models with polytomous variables can be handled by several computationally efficient procedures. However, sensitivity or influence analysis of the model is not well studied. We demonstrate that the existing influence analysis methods for contingency tables or for normal theory structural equation models cannot be applied directly to structural equation models with polytomous variables; and we develop appropriate procedures based on the local influence approach of Cook (1986). The proposed procedures are computationally efficient, the necessary bits of the proposed diagnostic measures are readily available following an usual fit of the model. We consider the influence of an individual cell frequency with respect to three cases: when all parameters in an unstructured model are of interest, when the unstructured polychoric correlations are of interest, and when the structural parameters are of interest. We also consider the sensitivity of the parameters estimates. Two examples based on real data are presented for illustration.The work described in this paper was partially supported by a Chinese University of Hong Kong Postdoctoral Fellows Scheme and a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (RGC Ref. No. CUHK4186/98P). We are indebted to P.M. Bentler and M.D. Newcomb for providing the data set, Michael Leung for his assistance, and the Editor and the referees for some very valuable comments.     

Certainty and Uncertainty: The Two Faces of the Hindsight Bias

“Hindsight Bias” is a person's tendency, after learning about the actual outcome of a situation or the correct answer to a question, to distort a previous judgment in the direction of this new information. In the literature, hindsight bias has been mostly discussed as an inevitable result of a “judgment under uncertainty.” We think that the hindsight bias is due to memorial as well as inferential processes: Whereas certainty about the recollection is memorial and concerns the recollective experience, certainty at the time of the judgment is inferential and concerns the individual's metaknowledge (“I know that I knew that”). In two experiments participants' feelings of certainty were measured indirectly (Koriat & Goldsmith, 1996) by giving participants the option of leaving those questions unanswered about which they felt uncertain. This free-report option was offered to half of the participants in the first estimate phase (concerning time of judgment) and to the second half in the memory phase (concerning the recollective experience). At the end of the session, participants were presented again with the questions they had skipped and were now required to answer them. This procedure allowed us to compare the amount of hindsight bias for the skipped, uncertain items to the spontaneously answered, certain ones. Both experiments demonstrated that the hindsight bias is a result of the interaction of both uncertainty and certainty.     

Rational Emotive Behavior Coaching

Managed care has led some psychotherapists to seek alternative modes of practice. Personal coaching provides one such approach. To what extent might an REBT practitioner already be “coaching”? How can REBT be meshed with personal coaching? What advantages and problems might ensue? What training is involved? These questions are answered based on the experiences of the author in shifting her work to what she calls Rational Emotive Behavior Coaching.     

大学生价值取向的特点及其与家庭因素的相关研究

采用问卷法对大学生的价值取向及其与家庭因素的关系进行了研究。发现当代大学生的价值取向呈现出注重平等、公正,男生比女生更看重个人发展的特点;相对来说,不重视个人需要的表达,而对权威的服从表现了相当的重视;大学生价值取向的特点状况与家庭因素,尤其与父母的养育风格、个体认同的影响源密切相关。     

Can Collective Responsibility for Perpetrated Evil Persist over Generations?

In the first part of the paper an argument is developed to the effect that (1) there is no moral ground for individual persons to feel responsible for or guilty about crimes of their group to which they have in no way contributed; and (2) since there is no irreducibly collective responsibility nor guilt at any time, there is no question of them persisting over time. In the second part it is argued that there is nevertheless sufficient reason for innocent individual members of a group (that persists over time) to take on responsibility and guilt for the evil other (earlier) members have committed. The reason depends on the acceptability of a particular psychological theory of personal identity.     

Quantum Mechanics and "Song of Myself": Getting a Grip on Reality

Most recent writing linking science and literature has concerned itself with challenges to the epistemological status of scientific knowledge in an attempt to demonstrate its contingency, arguing in the more radical efforts that the structures of science are no more than useful fictions. This essay also includes an epistemological comparison between science and literature, but instead of making grand or meta–statements about the nature of knowing generally in the two fields, mine is a much narrower aim. My exploration entails two tasks. First, I provide a close–up look at a particular type of experiment, called the delayed–choice experiment, which clearly reveals the strangeness of the quantum world. In connection with this experiment, I discuss wave functions—mathematical expressions used by physicists to describe quantum behavior and predict the outcome of experiments involving quanta. Second, I look at Walt Whitman's “Song of Myself” focusing on the meaning of the “self” in the poem. My aim is to treat the object of study in each field as a “text” and to assert and demonstrate a parallel in the strategies of thought and response between physicists (“readers”) pondering the meaning and status of a wave function and poem readers pondering the meaning and status of the poem's self. In Whitman's “Song” we find an attempt to understand complex aspects of human experience that are said to transcend ordinary reality, an effort for which I believe there are parallels in the attempts of modern physicists to understand complex, nonintuitive aspects of the subatomic world. While not making the kind of broad claims eschewed above, I do suggest that this focused study has interesting implications since both the wave function and the poem's self force their respective sets of “readers” to confront questions of ultimacy—to consider, that is, epistemological and ontological issues of more than passing interest to students of science as well as those of metaphysics and theology.     

When Subjectivism Matters

Abstract: In this article I consider when the question of whether entities exist subjectively (only in the minds of subjects) or objectively (in themselves, independently of the minds of subjects) is important, both theoretically and practically. I argue that when it comes to the metaphysics underlying three types of moral questions, broadly conceived, the subjectivity question does not matter practically, although it is widely thought to matter. Subjectivism does not matter in these moral questions in the same way(s) it matters in some nonmoral metaphysical issues. The moral questions I consider are the meaning of life, normative ethics, and the free‐will problem. The nonmoral issues I address are the existence of God, the traditional mind/body problem, and personal identity. I explain the difference by noting that certain metaphysical issues on the fact side of the fact/value distinction impinge on persons' lives more prominently than do the metaphysics behind the three moral questions.