Is subjective duration a signature of coding efficiency?

Area of Science:

• Cognitive psychology
• Neuroscience
• Perception science

Background:

• Perceived duration is often assumed to align with objective duration.
• However, research indicates that factors like stimulus repetition can alter subjective time perception.
• Repeated stimuli are often perceived as shorter than novel stimuli of identical physical duration.

Purpose of the Study:

• To propose a novel hypothesis linking perceived duration to neural coding efficiency.
• To offer a unified explanation for various duration illusions observed in psychophysical studies.
• To investigate how stimulus properties modulate the subjective experience of time.

Main Methods:

• Reviewing existing literature on duration illusions and repetition suppression.
• Formulating a hypothesis based on the concept of neural coding efficiency.
• Analyzing evidence from studies where stimulus characteristics (size, brightness, motion, flicker rate) affect perceived duration.

Main Results:

• Duration illusions, such as the shortening of perceived time for repeated stimuli, parallel neural repetition suppression.
• The hypothesis posits that subjective duration is a metric of the neural resources or energy required for stimulus representation.
• This coding efficiency model potentially explains a range of duration illusions.

Conclusions:

• Perceived duration is not a direct measure of objective time but rather an indicator of neural processing efficiency.
• Stimulus properties that enhance coding efficiency lead to a perception of shorter duration.
• This coding efficiency hypothesis provides a parsimonious framework for understanding subjective time perception.