The locus of the Stroop effect: one site masquerading as two?

Area of Science:

• Cognitive Psychology
• Experimental Psychology

Background:

• The Stroop task is a common method for studying cognitive interference.
• Understanding the locus of interference (e.g., output vs. pre-output stages) is crucial for cognitive models.

Purpose of the Study:

• To investigate the persistence of cognitive interference using modified Stroop tasks.
• To differentiate between interference occurring at output versus pre-output stages of information processing.
• To provide evidence for or against specific theories of cognitive code interaction.

Main Methods:

• Two experiments employed modified Stroop tasks with cued responses.
• Experiment 1 aimed to eliminate interference at the output stage.
• Experiment 2 aimed to rule out interference before the output stage.

Main Results:

• Cognitive interference effects were observed to persist in both experimental conditions.
• The modifications did not eliminate the expected interference patterns.
• Results indicate that interference is not solely localized at the output stage.

Conclusions:

• The persistent interference effects support Seymour's (1977) theory of overlapping conceptual codes.
• Interference appears to occur earlier in the processing stream than just the output stage.
• Findings contribute to understanding the mechanisms underlying cognitive interference and code representation.