Distributional analysis of semantic interference in picture naming

Area of Science:

• Cognitive Psychology
• Psycholinguistics
• Experimental Psychology

Background:

• Picture-word interference tasks assess semantic processing during speech production.
• Semantic interference occurs when distractor words are semantically related to target pictures, increasing response times (RTs).
• Previous research using ex-Gaussian analyses suggested semantic interference might be confined to the tail of the RT distribution (τ parameter).

Purpose of the Study:

• To replicate the semantic interference effect in mean picture naming RTs.
• To investigate the distributional characteristics of semantic interference using ex-Gaussian analysis.
• To determine if semantic interference is selectively linked to the distribution tail (τ) or also present in the main distribution (μ).

Main Methods:

• Participants performed a picture-naming task with semantically related and unrelated distractor words.
• Mean response times (RTs) were analyzed.
• Ex-Gaussian analyses were conducted on RT distributions to examine parameters μ (mean) and τ (tail).
• Data from the current study and a previous study were analyzed.

Main Results:

• The semantic interference effect was replicated in mean picture naming RTs.
• Ex-Gaussian analyses revealed that semantic interference was present in both the μ and τ parameters of the RT distribution.
• This pattern was consistent across the current and a previous study's data.

Conclusions:

• Semantic interference in picture naming is not selectively linked to the tail (τ) of the response time distribution.
• The effect is present in both the central tendency (μ) and the tail (τ) of the distribution.
• These findings caution against oversimplified interpretations of semantic interference effects based on specific distributional parameters.