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Parallel projections of dots on the surface of a transparent sphere rotating about a vertical axis provide strong impressions of depth and spherical shape. The hypothesis was tested that these impressions are the result of three perceptual heuristics: (a) The sinusoidal projected velocity function of each dot in the horizontal dimension tends to be perceived as a rotary motion in depth; (b) the projected velocity gradient in the vertical dimension is perceived as curvature in depth; and (c) the simultaneously visible fields of dots moving in opposite directions are perceived as surfaces separated in depth. When each factor was varied independently, all three significantly affected judgments of spherical shape and depth. Similar results were obtained with cylinders. The first factor was more important for shape judgments; the second was generally more important for depth judgments. These results, together with those of earlier studies in which these factors led to similar effects for different stimuli and transformations, suggest that these are general principles applicable to the perception of structure from both rigid and nonrigid motion.

Issue addressed: This paper explored the first-time use of Twitter by the Australian Health Promotion Association (AHPA) at its 2013 National Health Promotion Conference. Methods: The @AHPA_AU Twitter account and #AHPA2013 hashtag were established and included in the conference program. Attendees were encouraged throughout the conference to use it. A total of 748 tweets were captured under the hashtag #AHPA2013 in chronological order from 16-19 June 2013. Tweets with photos and more than one hashtag were recorded. A thematic analysis of tweets was conducted. Results: Thirteen broad themes were identified, with each of the 748 tweets allocated to one of the themes. Tweets about keynote sessions made up 38% of all tweets, followed by 14% for concurrent sessions. A photo was included in 11% of tweets, and 25% were sent to more than one hashtag. There were 96 tweeters; 75% of them posted five or less tweets and~9%, including a professional blogger, posted greater than 20 tweets. At the Aboriginal and Torres Strait Islander pre-conference workshop there was a relatively high level of Twitter engagement. Conclusion: Twitter could potentially be useful for promoting conference content and activities, but what it adds in value to a health promotion conference cannot be determined by this study.So what? This paper highlights the engagement of tweeters with conference content and activities and suggests that tweeting benefited from the engagement of a professional health blogger.

Activities.&dquo;I am determined that our new training camps, as well as the surrounding zones within an effective radius, shall not be places of temptation and peril.&dquo; Into these words, written six weeks after America's entry into the world conflict, the Secretary of War condensed a policy not only strikingly new in American preparations, but also in the military history of the world. They were included in a letter written on May 26 to the governors of all the states. Essentially they only gave expression to the conviction which had been previously incorporated in the legislation known as sections 12 and 13 of the Selective Draft Act. The sentence gave notice to the nation and the world that the new American Army, so far as the efforts of the War Department could be made effective, was to be in every sense morally fit for the high cause in which the United States had just enlisted. Secretary Baker further had expressed the policy in these words:Our responsibility in this matter is not open to question. We can not allow these young men, most of whom will have been drafted to service, to be surrounded by a vicious and demoralizing environment, nor can we leave anything undone which will protect them from unhealthy influences and crude forms of temptation. Not only have we an inescapable responsibility in this matter to the families and communities from which these young men are selected, but, from the standpoint of our duty and our determination to create an efficient army, we are bound, as a military necessity, to do everything in our power to promote the health and conserve the vitality of the men in the training camps.The policy had not been chosen at random in the first place: as with so many other factors involved in our entry into the war, we had the benefit and the experience of our Allies and of our foes as well. Publicity has been given to the bitter lesson of one of the allied armies, which, during the first eighteen months of the war, saw more of its men out of action through the ravages of venereal disease than from all other physical causes combined. A Vienna specialist has estimated that at one time and another an equivalent of sixty Austrian divisions have been on the non-effective list for at Yale University Library on July 1, 2015 ann.sagepub.com Downloaded from