Using relative-speed-of-processing to explain the shielding function of task rules

Area of Science:

• Cognitive Psychology
• Neuroscience
• Human-Computer Interaction

Background:

• Choice reaction tests (CRT) often involve distractors that impair performance.
• Applying task rules is thought to shield against distractor interference, but the underlying mechanism is unclear.
• The relative-speed-of-processing theory offers a potential explanation for shielding effects.

Purpose of the Study:

• To investigate the mechanism by which applying task rules shields against distractor interference in CRTs.
• To test the predictions of the relative-speed-of-processing theory regarding distractor interference.
• To determine if task rule application directly or indirectly reduces interference.

Main Methods:

• Four experiments were conducted using choice reaction tests.
• Methods included manipulating task rule application (rules vs. associative responding).
• Temporal sequences of target and distractor presentation were varied, and processing speeds were directly manipulated.

Main Results:

• Applying task rules facilitated target processing speed, reducing the distractor's relative processing advantage and eliminating interference (Experiment 1A).
• When distractor processing advantage was high, task rules did not prevent interference; when low, interference was absent even without rules (Experiments 1B, 1C).
• Contrary to expectations, participants applying task rules showed interference when target processing was not facilitated, while associative responders did not (Experiment 2).

Conclusions:

• Applying task rules does not directly shield against interference.
• Task rule application indirectly shields by enhancing target processing speed.
• This speed enhancement reduces the distractor's relative processing advantage, thereby mitigating interference effects.