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Marc Grosjean has investigated the time course of cognition through measurements of action. In a 2005 study with colleagues, he analysed mouse tracking data to test how spoken word recognition unfolds while a listener is already moving toward a possible answer.^[ref]

Participants saw two pictured objects and heard the name of one. A target such as “candle” could appear beside “candy”, whose name shares its beginning, or beside a phonologically unrelated object. The investigators sampled the cursor's coordinates during the movement, rather than recording only its endpoint. Movements toward the correct object were drawn farther toward the competing object in the similar-name condition.^[ref]

The example makes a measurement distinction concrete. Two trials can end with the same correct click yet follow different paths, revealing phonological competition that accuracy alone would miss. The cursor is an observable motor response, so conclusions about internal representations still require an explicit model connecting movement with language processing.

Michael J. Spivey-Knowlton, who publishes as Michael Spivey, studies interactions among language, vision and action. His curriculum vitae links the earlier publication name to his later work, and the University of California, Merced describes his use of both eye tracking and mouse tracking to investigate ongoing interpretation.^[ref][ref]

Recording a continuous pointing trajectory supplies evidence that a final button choice loses. In an illustrative task, two trials could end at the same correct target while one movement initially curves toward a competitor. Comparing the trajectories then raises a testable question about competing interpretations. The movement remains an indirect behavioral measure: motor demands and display geometry must also be considered. His work connects such measurements with computational explanations of how multiple information sources contribute during sentence comprehension.

Mouse tracking records a computer pointer's trajectory over time as a behavioral measure. In psycholinguistics, its Cartesian coordinates can reveal differences between trials that end in the same choice. The trajectory complements final accuracy and reaction time by preserving part of the movement toward the response.

Michael Spivey, Marc Grosjean and Günther Knoblich tested 42 participants with two object pictures in opposite upper corners of a screen. Participants started at the bottom center; a prerecorded word named the target 0.5 seconds after the pictures appeared. A candy distractor shared initial sounds with the target candle, while a jacket provided a dissimilar control. Movements showed greater attraction toward the competing object before reaching the correct target.^[ref]

The authors used linear interpolation to compare trajectories at 101 normalized time positions. That procedure preserves relative movement progression while changing its time scale. Display geometry and movement instructions remain part of the measurement; a curve alone is not a uniquely identified mental state.

Phonological competition occurs when speech forms with overlapping sounds are simultaneously plausible candidates during spoken word recognition and influence the eventual selection. For example, hearing the beginning of “candle” can make “candy” temporarily relevant as well. Later acoustic evidence can resolve the ambiguity even though the alternative has already affected processing.

In a 2005 experiment, a listener saw two pictures and used a mouse to select the named object. When the competing picture had a similar-sounding name, such as “candy” beside “candle”, the movement toward the correct object was drawn farther toward that competitor than toward an unrelated alternative. The comparison demonstrated an effect of phonological competition on the path of the response, beyond whether the final click was correct.^[ref]

This suggests a useful experimental distinction: accuracy measures the final choice, while reaction time and mouse tracking can reveal costs and intermediate influences. Similarity alone does not establish competition; a controlled manipulation must show that the alternative changes processing or behaviour.

Spoken word recognition is the process of identifying familiar spoken forms from an unfolding speech signal and accessing the corresponding lexemes. It occurs as information arrives: the beginning of an utterance may fit several possible forms, while later sounds distinguish them. The temporary candidate set is a lexical cohort.

For example, the beginning of “candle” is also compatible with “candy”. As the later sounds arrive, the evidence changes. Recognizing the item therefore involves both sensitivity to the incoming sounds and access to stored phonological representations; it is not necessary to wait for a silent gap before beginning to interpret the signal.

A 2005 mouse tracking experiment made this changing evidence visible in action. Participants heard a target name while moving toward one of two pictures. A similar-sounding alternative altered the movement path even on trials ending at the correct picture. The result supported an account in which spoken word recognition can influence an ongoing action before the final choice is complete.^[ref]

The measured cursor path is a behavioural consequence of recognition, rather than a direct recording of a phonological representation. The inference linking the two must be made explicit.