Final answer:
Conjunction search increases search time, while decreasing set size, contextual cueing, and the pop-out effect decrease it.
Step-by-step explanation:
Among the options given, conjunction search is the type of visual search task that increases the search time. In a conjunction search, the target is defined by a combination of features, such as color and shape. This type of search requires more cognitive effort and time compared to other types of visual search tasks.
Alternatively, decreasing the set size actually decreases the search time. When the set size is smaller, there are fewer distractors to consider, making it easier to locate the target quickly.
Contextual cueing, on the other hand, can actually decrease search time. It involves learning associations between the context and the location of the target, which can help guide attention and speed up the search process.
The pop-out effect, like contextual cueing, can also decrease search time. In a pop-out effect, the target stands out from the distractors and can be quickly and effortlessly detected.