There has been a considerable improvement in the epidemiological situation in the Americas in regard to tuberculosis. Mortality rates during the period 1951-1960 fell in North America by almost 70 per cent, in Middle America by 45 per cent, and in South America by 54 per cent. The decrease over the succeeding years from 1960 to 1966 was slower, but there was nevertheless some progress, the thre...

Blacks and whites are compared with respect to selected provisions of the OA6DHI programtype of benefiezary, age of beneficiaries, size of benefits, and size of covered earnfngs-for the period from 1960 to 1973. There have been substantial increases in the number of black beneficiaries since 1960, and in most beneficiary groupe blacks have increased proportionately more than whites. Black8 are ...

IN a previous publication, the author reported that an increased sensitivity to pain followed the use of small doses of thiopentone and pentobarbitone (Dundee, 1960), thus confirming the findings of Clutton-Brock (1960). It was suggested that this anti-analgesic action of thiopentone was due to low concentrations of the drug in the brain and the phenomenon was also demonstrated in the postopera...

This essay will attempt a broad outline of the strategies of State employed in the Islamic Republic of Mauritania. The nomadic population there is organized into kinship groups, or corporated groups called qabâ'il (sing. qabîla) or ‘tribes.’ —even if the ‘tribe’ is not a ‘total society’, but —as Emanuel Marx suggest (in this volume)—“it is merely one of a variety of organizations in which the n...

Practice can dramatically reduce dual-task interference, but typically does not eliminate interference entirely. Residual interference after practice is especially large with certain non-preferred modality pairings (e.g., auditory-manual and visual-vocal). Does this residual interference imply the existence of a persistent central-processing bottleneck? To address this question, we transferred ...

In this research, the controversial issue of whether the central bottleneck can be bypassed through task automatization was investigated. To examine this issue, participants received six single-task practice sessions with an auditory-vocal task (low vs. high pitch). We then assessed dual-task performance using the analytically tractable psychological refractory period (PRP) paradigm, in which t...

The authors examined the role of online order control in the psychological refractory period (PRP) paradigm. In the first 2 experiments, participants switched between color-letter and letter-color orders so that subtask order was isolated as the only element being switched. The results indicated that order switching impaired the 2 PRP responses and modulated the PRP effect. Importantly, these e...