Eriksen and St James (1986) argued that performance on the Eriksen flanker task is best explained by:

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To analyze Eriksen and St James (1986) on the Eriksen flanker task, we must compare competing theoretical accounts of how flankers influence reaction time and accuracy.
Option A states a capacity theory where targets and flankers compete for a single pool of cognitive resources, predicting longer RTs with incompatible flankers due to limited capacity. However, this interpretation does not capture the key proposal of Eriksen and St James, which emphasizes flexible allocation of attention rather than a single, undifferentiated capacity bottleneck. In other words, the capacity view treats all information as drawing from the same resource in a general way, which does not specifically explain why an initial broad or narrowed attentional focus would lead to the observed pattern of flanker interference.
Option B suggests a late selection theory, positing that incompatible flankers are processed by a limited-capacity channel only after early processing. The flanker effect in the original work is best characterized as arising from earlier perceptual processing where flankers influence response selection, not from a late, post-perceptual bottleneck. Thus this option misplaces the stage at which flankers interfere, making it an inaccurate account for the classic findings.
Option C presents a zoom lens model, where attention can be widened to include flankers in an initial broad (or "zoomed out") stage, which increases RT when flankers are incompatible. This directly mirrors Eriksen and St James’s core claim: the attentional field can be expanded to capture flankers, and when flankers are irrelevant or incompatible, the processing load increases, slowing responses. The idea of a modulable attentional scope explains why compatibility and spatial arrangement modulate reaction time in the flanker task.
Option D describes a two-stage model in which nontarget items are rejected during an initial parallel scan of the display, leading to increased RT for incompatible flankers. While some dual-stage or parallel-then-serial frameworks have been proposed in attention literature, this description does not align with the specific zoom-lens account proposed by Eriksen and St James for the flanker paradigm, which emphasizes the flexible scope of attention rather than a discrete early rejection mechanism.
In sum, the zoom lens explanation (Option C) captures the essence of Eriksen and St James’s argument: attention can be aperture-like, widening to include flankers, and the processing cost arises from that initial broad focus when flankers are incompatible. The other options misstate the stage of processing, the nature of attentional selection, or the core mechanism of the flanker interference as described in the original proposal.

Eriksen and St James (1986) argued that performance on the Eriksen flanker task is best explained by:Single choice

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