When searching for a vertical blue bar among a set of horizontal yellow bars, we would expect to find a display size function in which:

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BlackTom AI · Accepted Answer

To analyze this question, I will look at what the expected display size function would look like in a visual search task where the target is a vertical blue bar among horizontal yellow bars.
Option 1 proposes that Mean RT is a linear function of display size with the slope for target-absent displays about twice that for target-present displays. This would imply target-absent trials get much slower as displays get larger, which is not typically how basic visual search display-size effects are described when a pop-out target is present or absent, making this claim suspicious.
Option 2 suggests Mean RT is a linear function of display size with the same slopes for target-absent and target-present displays. If the slopes were identical, both conditions would scale equally with display size, which could be plausible in some models, but it doesn’t capture the common finding that search efficiency can differ between target-present and target-absent cases, especially in parallel vs. serial processing considerations.
Option 3 states that Mean RT is roughly constant for displays of different size and is the same for target-present and target-absent displays. This aligns with classic feature search or pop-out scenarios where a single, salient target can be found without substantial increase in response time as the number or size of distractors grows, leading to an approximately flat RT across display sizes and no difference between target-present and target-absent conditions in many basic demonstrations.
Option 4 claims Mean RT is a linear function of display size with the slope for target-present displays around twice that for target-absent displays. This would imply target-present trials benefit or suffer disproportionately from increased display size, which is a less common description for standard visual search tasks where the target is salient and search efficiency often remains relatively unaffected by display size, at least in comparisons like the classic pop-out search.
In summary, the most consistent expression given the described search task (a vertical blue bar among horizontal yellow bars) is that reaction time does not vary strongly with display size and does not differ markedly between target-present and target-absent conditions, supporting the constant RT interpretation.
Therefore, the option indicating Constant RT across display sizes and no difference between target-present and target-absent conditions is the most consistent with expected display-size functions in such a search paradigm.

PSYC20007_2025_SM2 Exam: Cognitive Psychology (PSYC20007_2025_SM2)- Requires Respondus LockDown Browser

When searching for a vertical blue bar among a set of horizontal yellow bars, we would expect to find a display size function in which:

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