Simon-type effects: chronometric evidence for keypress schemata in typewriting

Area of Science:

• Cognitive Psychology
• Human-Computer Interaction
• Experimental Psychology

Background:

• Understanding the cognitive processes underlying skilled typing is crucial for human-computer interaction.
• The role of internal representations, or schemata, in motor control and typing remains an area of active research.

Purpose of the Study:

• To investigate the chronometric evidence for keypress schemata in typing.
• To determine if stimulus position influences typing reaction times and internal response representations.

Main Methods:

• Four experiments were conducted using chronometric measurements.
• Stimuli (letters and words) were presented at positions displaced from a central fixation point.
• Reaction times were measured based on stimulus presentation and keyboard locations.

Main Results:

• Reaction times were significantly shorter when stimulus positions matched keyboard locations.
• Evidence for parallel activation of keypress schemata was found when typing words.
• No effect of stimulus eccentricity on response-location coding was observed, suggesting categorical coding.

Conclusions:

• Typing involves internal representations (keypress schemata) where keyboard location is a critical component.
• Response-location codes in typing appear to be categorical rather than metric.
• Findings support existing theories of typewriting, such as Rumelhart and Norman's (1982) model.