The article by Yantis and Jonides (1984) demonstrated that the detection of a target in visual search is significantly enhanced when the target is presented with an abrupt onset, compared to other stimuli that are not. This effect was attributed to a shift of attention caused by the abrupt onset. In subsequent experiments, the authors investigated whether other stimulus characteristics, such as luminance and hue, could also elicit shifts of attention, but found that they could not. In the first experiment, subjects were presented with three different stimulus sets: one with an onset item embedded among no-onset items, another with a bright item among dim items, and a third with a red item among green items. The results showed that only the onset condition exhibited attentional capture, while the intensity and color conditions did not. This suggests that abrupt onset is unique in its ability to capture attention, rather than being a general property of salient stimuli. The second experiment further explored this finding by using larger display sizes and comparing the onset condition with the intensity and color conditions. The results confirmed that only the onset condition showed attentional capture, while the intensity and color conditions did not. This indicates that the nature of the stimulus difference is critical; items with abrupt onsets attract attention, whereas color or intensity differences do not. The third experiment directly compared the effects of color as a target and as a unique item. When color was the target, subjects were instructed to focus on it, which allowed for a direct comparison with the color condition in Experiment 2. The results showed that when color was the target, subjects employed a "single-examination" mode of search, focusing on the unique color item and comparing it with the target in memory. This suggests that while color can be a reliable search cue, it does not capture attention in the same way that abrupt onset does. In conclusion, the experiments demonstrate that attentional capture is unique to stimuli with abrupt visual onset and does not occur with other salient features like color or intensity. This supports the hypothesis that abrupt onset may activate specialized visual channels that automatically seize attentional resources.The article by Yantis and Jonides (1984) demonstrated that the detection of a target in visual search is significantly enhanced when the target is presented with an abrupt onset, compared to other stimuli that are not. This effect was attributed to a shift of attention caused by the abrupt onset. In subsequent experiments, the authors investigated whether other stimulus characteristics, such as luminance and hue, could also elicit shifts of attention, but found that they could not. In the first experiment, subjects were presented with three different stimulus sets: one with an onset item embedded among no-onset items, another with a bright item among dim items, and a third with a red item among green items. The results showed that only the onset condition exhibited attentional capture, while the intensity and color conditions did not. This suggests that abrupt onset is unique in its ability to capture attention, rather than being a general property of salient stimuli. The second experiment further explored this finding by using larger display sizes and comparing the onset condition with the intensity and color conditions. The results confirmed that only the onset condition showed attentional capture, while the intensity and color conditions did not. This indicates that the nature of the stimulus difference is critical; items with abrupt onsets attract attention, whereas color or intensity differences do not. The third experiment directly compared the effects of color as a target and as a unique item. When color was the target, subjects were instructed to focus on it, which allowed for a direct comparison with the color condition in Experiment 2. The results showed that when color was the target, subjects employed a "single-examination" mode of search, focusing on the unique color item and comparing it with the target in memory. This suggests that while color can be a reliable search cue, it does not capture attention in the same way that abrupt onset does. In conclusion, the experiments demonstrate that attentional capture is unique to stimuli with abrupt visual onset and does not occur with other salient features like color or intensity. This supports the hypothesis that abrupt onset may activate specialized visual channels that automatically seize attentional resources.