'Subjective lengthening' during repeated testing of a simple temporal discrimination

Area of Science:

• Cognitive Psychology
• Psychophysics
• Neuroscience

Background:

• Temporal generalization paradigms assess time perception.
• Repeated testing without feedback can alter behavioral responses.
• Arousal levels are known to influence cognitive processes, including time perception.

Purpose of the Study:

• To investigate behavioral changes in human subjects using a temporal generalization paradigm.
• To examine the effect of repeated testing without feedback on temporal judgments.
• To explore the relationship between arousal and shifts in temporal generalization gradients.

Main Methods:

• Three experiments utilized a temporal generalization paradigm with human subjects.
• Participants judged stimulus durations (tones or visual stimuli) against a standard, without feedback.
• Arousal was measured using a self-rating scale in Experiment 3.

Main Results:

• Temporal generalization gradients shifted progressively to the right during testing, indicating longer stimuli were increasingly identified as the standard duration.
• This rightward shift was observed consistently with visual stimuli and duration judgments, but not length judgments.
• Subject arousal systematically declined as testing proceeded.

Conclusions:

• Repeated testing without feedback induces a rightward shift in temporal generalization gradients.
• The observed shift is likely mediated by arousal-induced changes in internal clock speed.
• This highlights the dynamic nature of time perception influenced by sustained cognitive engagement and physiological state.