A twin study of spatial and non-spatial delayed response performance in middle age

Delayed alternation and object alternation are classic spatial and non-spatial delayed response tasks. We tested 632 middle-aged male veteran twins on variants of these tasks in order to compare test difficulty, measure their inter-correlation, test order effects, and estimate heritabilities (proportion of observed variance due to genetic influences). Non-spatial alternation (NSA), which may involve greater reliance on processing of subgoals, was significantly more difficult than spatial alternation (SA). Despite their similarities, NSA and SA scores were uncorrelated. NSA performance was worse when administered second; there was no SA order effect. NSA scores were modestly heritable (h(2)=.25; 26); SA was not. There was shared genetic variance between NSA scores and general intellectual ability (r(g)=.55; .67), but this also suggests genetic influences specific to NSA. Compared with findings from small, selected control samples, high "failure" rates in this community-based sample raise concerns about interpretation of brain dysfunction in elderly or patient samples.     

The Suicide of Seymour Glass

ABSTRACT: This paper explores the suicide of Seymour Glass, a major character in J. D. Salinger's fiction and utilizes the “psychological autopsy” technique as a framework for investigating the psychodynamics of Seymour's death. Based upon materials provided throughout Salinger's stories, the suicide is analyzed in terms of five major elements related to Seymour's emotional state and manifest behaviors: (1) details of the death; (2) personal history; (3) level of perturbation; (4) personality and life-style; and (5) intention and lethality of the act. Additionally, this essay posits various interpretations of the suicide and allows for insights into the psychodynamic functioning of a major literary character.