The apparently deleterious effect of aging on dual-task performance is well established, but there is little agreement about the source of this effect. Studies of the psychological refractory period (PRP) indicate that young adults can flexibly control dual-task performance through task-coordination strategies. Thus, the performance of older adults might differ from young adults because older a...

Why is the human brain fundamentally limited when attempting to execute two tasks at the same time or in close succession? Two classical paradigms, psychological refractory period (PRP) and task switching, have independently approached this issue, making significant advances in our understanding of the architecture of cognition. Yet, there is an apparent contradiction between the conclusions de...

BACKGROUND Tourette syndrome (TS) has been described as peaking in adolescence with subsequent regression. We report patients who were diagnosed with TS during childhood who experienced a latent period (significant reduction in or absence of tics) followed by tic re-emergence in adulthood. METHODS We performed a retrospective chart review of outpatients over age 21 seen at the Yale neurology ...

ABSTRACT Wild-type fungal population 851-WT was selected for shortened latent period on cv. CI 13227 for five uredinial generations to study the adaptation of Puccinia recondita f. sp. tritici to partially resistant wheat cultivars. Differences among wild-type and selected populations for traits contributing to parasitic fitness (i.e., latent period, infection frequency, and uredinium area and ...

The involvement of the L-arginine-nitric oxide (NO) pathway in the pathogenesis of hyperoxia-induced seizures was studied by using agents controlling NO levels. We selected two inhibitors of nitric oxide synthase, the systemic inhibitor Nomega-nitro-L-arginine methyl ester (L-NAME) and the novel cerebral-specific inhibitor 7-nitroindazole, and two generators of NO, the NO donor S-nitroso-N-acet...

A system is described in which rhinovirus 2 may be grown in suspension cultures of L 132 ceils. The virus adsorbed to the cells more efficiently at 33 ° than at 4 °, probably by means of specific trypsin-sensitive lipoprotein receptors on the cells. Virus penetration demonstrated using a potent virus antiserum was temperature-sensitive and rapid at 33 ° . During single-cycle virus growth at 33 ...

Phagocytosis of latex spheres was studied in explant cultures of retinal pigment epithelium from rabbit, calf, and rat (normal and dystrophic). Calf and rabbit pigment epithelial cells showed a "latent period" of about 12 and 17 hr, respectively, during which latex spheres were not ingested even when the cultures were pre-incubated for up to 24 hr prior to exposure. Scanning electron microscopy...

It has already been reported by Izeki and Sakai (1) (2) that S . newington is lysogenic and the bacteriophage liberated from this micro-organism transduces the antigenic structure of S. anatum (3.10) to that of S . newington (3.15). During the study of this transduction phenomenon, it was found that there was sometimes a mutant strain of S. anatum on which the bacteriophage liberated from S. ne...