This research looked at Biba: a suite of mobile games intended to get kids back out to playgrounds and engaging in more moderate to vigorous physical activity (MVPA). Year after year, annual national surveys report a general decline in physical activity amongst children and a corresponding increase in screen time. Further to this, time spent outside by children has been reported to be on the decline since the 1980s. Recent work has suggested that in order to 'maintain the outdoor recreation participation of children across America, park and recreation professionals may need to embrace the expanding role of technology'. This research tested Biba in precisely this regard, deploying a 20-subject within-subject experimental design that compared Biba playground gameplay with typical free play playground sessions, measuring heart rate activity in them. The outcome demonstrated that Biba playground play results in greater amounts of MVPA with a difference in heart rate that was significantly higher in the Biba play session than in the free play session t(19) = 2.41, p < 0.05.

When multiple targets are presented in rapid sequence, observers frequently confuse the order in which they were presented. The probability of order reversals is known to vary throughout the period of the attentional blink (AB), which refers to impairment in the perception of the second of two targets when it is presented within approximately 500 ms from the first. Our objective was to examine the principle of prior entry (in which perception of temporal order is said to be affected by the relative latency at which each target is processed) as a determinant of the perception of temporal order throughout the AB. In two experiments, three letter targets (T1, T2, T3) were inserted in a stream of digit distractors, with T3 always presented directly after T2. The T1-T2 lag was varied to assess the perception of T2-T3 temporal order throughout the period of the AB. Processing latency was manipulated by means of salience. In Experiment 1, salience of T2 and T3 was manipulated exogenously by coloring the salient target red with all other stimuli being green. In Experiment 2, salience was modulated endogenously by manipulating which of the two targets matched the contents of working memory. Consistent with the principle of prior entry, perception of temporal order in both experiments was enhanced throughout the period of the AB when T2 was salient, and impaired when T3 was salient. Simulations based on the Episodic Simultaneous Type, Serial Token (eSTST) model that incorporates prior-entry, matched the empirical results.Keywords Theoretical and Computational Models . Attentional blink . Selective attention When two stimuli are presented in rapid sequence, observers frequently confuse the order in which they were presented. Among the factors thought to determine the perception of temporal order is the relative amount of attention deployed to the stimuli. That is, the perception of temporal order of two sequential stimuli is determined not only by the actual order of presentation but also by the relative amount of atten-

per vehicle mile travelled is appreciably higher on the motorway than on other types of road. . ." seems to fulfil the prophecy of Fitzwater Wray, in " The Kuklos Papers " (1927), when the agitation for cyclists' rear lights was in full spate and cyclists were called the " greatest menace on the roads," to the effect that the removal from the roads of all users but motorists would simply mean that the latter would run into each other at higher speeds.-I am, etc., Liskeard, Cornwall. W. H. SPOOR.

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