An empirical investigation into how users adapt to mobile phone auto-locks in a multitask setting
An empirical investigation into how users adapt to mobile phone auto-locks in a multitask setting
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用户在多任务环境下如何适应手机自动锁定的实证研究
DOI：
10.1145/2371574.2371616
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Brumby D
中科院分区：
文献类型：
--
作者：
Brumby D
自动锁定是许多现代移动设备的必要功能，但它们有时会产生有害后果吗？在本文中，我们研究了自动锁定如何影响多任务场景中的行为。在一项研究中，参与者必须在实验室环境中驾驶模拟车辆时使用触摸屏界面输入文本。在次要设备上实现了不同的自动锁定机制，操纵锁定阈值的持续时间（即，启动自动锁定之前的不活动时间）和解锁过程的复杂性（即，一旦设备被锁定，用户解锁设备的难易程度）。结果表明，当锁定阈值较短时，驾驶员在主要驾驶任务中的车道保持性能较差。原因有两方面：(1)参与者在输入动作之间的长时间停顿更少，以避免被锁定在设备之外；(2)当设备锁定时，解锁需要时间，进一步分散驾驶员的注意力。为了支持后一项发现，我们还发现，需要输入pin码的更复杂解锁程序导致的车道保持性能比简单按下按钮解锁时更差。这些发现表明，自动锁定可以阻止用户在其他正在进行的活动之间定期交叉关注。在移动设备中加入自动锁定功能时，设计师应该牢记这一点。
Auto-locks are a necessary feature on many modern day mobile devices, but can they sometimes have detrimental consequences? In this paper we investigate how auto-locks can affect behavior in a demanding multitasking scenario. A study is conducted in which participants had to enter text using a touch-screen interface while driving a simulated vehicle in a lab setting. Different auto-lock mechanisms were implemented on the secondary device, manipulating both the duration of the lockout threshold (i.e., the period of inactivity before the auto-lock was initiated) and the complexity of the unlock procedure (i.e., how easy it was for the user to unlock the device once it had locked). Results showed that lane-keeping performance on the primary driving task was worse when there was a shorter lockout threshold. The reason for this was two-fold: (1) participants took fewer long pauses between typing actions, so as to avoid being locked out of the device, and (2) when the device did lock, unlocking it took time and further distracted the driver. In support of this latter finding, we also found that a more complex unlock procedure, which required a pin code to be entered, resulted in worse lane-keeping performance than when the device could be unlocked by making a simple button press. These findings suggest that auto-locks can dissuade users from regularly interleaving attention between other ongoing activities. Designers should keep this in mind when incorporating auto-locks in mobile devices.
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