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for a total duration of about 10 minutes. The task is not challenging, but is purposefully unstimulating in order to measure participants’ ability to focus and sustain attention (Riccio, Reynolds, Lowe, & Moore, 2002) The CCPT is a modified version of this original task in which respondents must attend to the conjunction of two visual qualities, color and shape. It has been argued that the CPT’s use of single letters or numbers is not as efficient for measuring attention because it is possible that these very familiar, overlearned, stimuli are processed effortlessly and subconsciously (Shalev, Ben-Simon, Mevorach, Cohen, & Tsal, 2011). The CCPT is designed to correct for this potential flaw by having the task stay simple while adding a conjunction component to the stimuli, which, presumably, requires focused attention to visually bind the features together (Shalev, Ben-Simon, Mevorach, Cohen, & Tsal, 2011). The “conjunction” is the addition of another feature to which the participant must attend. In this case changing the CPT from a single feature stimuli (numbers) into a more varied stimulus (varying shapes, as well as colors). The version of the CCPT used here included four distinct shapes and four distinct colors which were combined for a total of 16 possible stimuli. The target, a red square, appeared 30% of the time, non-red squares (blue, green and yellow squares) appeared 17.5% of the time, red non-squares (red circles, triangles, and stars) appeared 17.5% of the time, and non-targets with none of the target features (blue/yellow/green circle/triangle/star) appeared the other 35% of the time. Stimuli were presented for 100ms with a randomized blank period of either 1000ms, 1500ms, 2000ms, or 2500ms in between the presentation of each stimulus (visualized in Figure 5). The task lasted approximately 10 minutes. 15PDF Image | The Effects of Lighting Design on Mood, Attention, and Stress
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