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Tracking second thoughts: continuous and discrete revision processes during visual lexical decision.

Laura Barca¹, Giovanni Pezzulo¹

¹Institute of Cognitive Sciences and Technologies, National Research Council, Rome, Italy.

|February 21, 2015

Summary

This summary is machine-generated.

Mouse movement dynamics reveal distinct decision processes for words versus pseudowords. Pseudowords show a discrete "change of mind" during lexical decisions, unlike words which involve continuous competition.

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Area of Science:

Cognitive Psychology
Psycholinguistics
Computational Neuroscience

Background:

Lexical decision tasks (LDTs) involve categorizing stimuli as words or nonwords.
Previous research indicated greater mouse movement curvature for low-frequency words and pseudowords in LDTs.
The underlying decision dynamics, whether continuous competition or discrete revision, remained unclear.

Purpose of the Study:

To differentiate between continuous competition and discrete revision processes in lexical decisions.
To analyze mouse movement velocity and acceleration profiles during stimulus categorization.
To investigate the online cognitive processes underlying word and pseudoword recognition.

Main Methods:

Participants performed lexical decisions on various stimuli (words, pseudowords, letter strings).
Mouse movements toward response buttons were recorded and analyzed for velocity and acceleration.
Kinematic data were examined to identify distinct patterns indicative of decision-making processes.

Main Results:

Pseudowords exhibited a delayed peak movement velocity compared to words and letter strings.
Word and letter string acceleration profiles showed a typical butterfly pattern.
Pseudowords displayed a unique double-peak acceleration profile, suggesting response revision.

Conclusions:

Lexical decisions for pseudowords involve a discrete revision process, indicated by distinct kinematic signatures.
Low-frequency words appear to be processed through a continuous competitive mechanism.
Mouse movement kinematics provide valuable insights into the temporal dynamics of cognitive decisions.