Activation of lexical codes for simultaneously presented words: modulation by attention and pathway strength

Area of Science:

• Cognitive Psychology
• Neuroscience
• Psycholinguistics

Background:

• Word recognition involves multiple processing levels, including prelexical, orthographic-phonological, and semantic codes.
• Attentional modulation theories propose that attention can influence the processing of sensory information.

Purpose of the Study:

• To investigate how spatial attention affects word recognition processes.
• To examine the activation of different word codes (prelexical, orthographic-phonological, semantic) for unattended words.
• To test predictions of the pathway strength model of attentional modulation.

Main Methods:

• Participants performed a word recognition task with horizontal and vertical strings presented in different visual fields.
• Distractor strings, varying in similarity to the target, were used to assess interference and facilitation.
• Pronunciation responses were recorded to measure word recognition efficiency.

Main Results:

• Distractor effects were stronger when attention was directed to the weaker (vertical) item compared to the stronger (horizontal) item.
• Distractors similar to the target word facilitated pronunciation responses.
• Distractors dissimilar to the target word interfered with pronunciation responses.

Conclusions:

• Spatial attention can dynamically modulate word recognition at various processing levels.
• The findings support the pathway strength model, indicating that attentional effects depend on the relative strengths of competing information pathways.
• Word recognition is not a strictly serial or noninteractive process, as suggested by attentional modulation.