[Three-channeled aortic dissection; report of a case].

The formation of 2 adjacent lumens is rarely observed in aortic dissection. We report herein a case of ruptured 3-channeled aortic dissection in a short time of hospitalization. A 58-year-old man who had been followed up for aortic dissection (Stanford type B) was admitted to Kumamoto National Hospital with an abdominal pain and a lumbago. A computed tomography (CT) revealed that a 3-channeled aortic dissection from the aortic arch to the right common iliac artery. An intramural hematoma was generated in the abdominal aorta and the left kidney was not enhanced. We initially adopted conservative therapies. But on the next day, he suddenly complained a severe back pain and died. At autopsy, the thoracic aorta was found to have ruptured into the mediastinum, and massive hematoma was formed.

[Information processing in Stroop-like picture naming tasks by preschool children].

This study examined the difference between preschool (6-year-olds) children and adults in semantic information processing in line-drawn picture naming, using two types of Stroop-like picture naming tasks. In Experiment 1, voices (i.e., lexical information), and in Experiment 2, pictures (i.e., semantic information) were used as distracters. Subjects were asked to name target pictures as quickly as possible, ignoring distracters. To clarify the effect of semantic relations on the amount of interference, four types of target-distracter semantic relations were used as experimental conditions: same stimulus (SS), same category (SC), different category (DC), and control (C). To investigate the time course of processing, stimulus onset asynchrony (SOA) between target and distracter was varied. The results indicated that the patterns of reaction time showed more remarkable difference between children and adults in Experiment 1 than in Experiment 2. These results were discussed on the basis of Glaser and Glaser (1989)'s model in which semantic memory and lexicon were separate.