Distinctive features of experiential time: Duration, speed and event density

Area of Science:

• Cognitive Neuroscience
• Psychology of Time Perception

Background:

• William James's concepts of "time in passing" and "stream of thoughts" suggest the brain processes continuous information by segmenting it into discrete events.
• Understanding how event density impacts subjective temporal experiences is crucial for cognitive science.

Purpose of the Study:

• To investigate how the density and type of events in visual stimuli affect the perception of subjective duration and the speed of time's passage.
• To explore potential distinct neural mechanisms underlying these two facets of temporal experience.

Main Methods:

• A temporal bisection task was employed, where participants judged seconds-long videos of naturalistic scenes.
• Videos varied in the number and type of discrete events presented.
• Participants classified stimuli based on perceived duration (short/long) and speed of time passage (slow/fast).

Main Results:

• Increased event density led to a lengthened subjective duration and an accelerated perception of time's passage.
• Participants exhibited faster estimation times for the speed of time passage compared to subjective duration.
• Subjective duration perception correlated with both stimulus duration and event density.
• The perceived speed of time passage correlated with the rate of change within the stimuli.

Conclusions:

• Distinct neural mechanisms likely underlie the perception of subjective duration and the speed of time's passage.
• The brain's segmentation of continuous information into discrete events is fundamental to these temporal experiences.
• Event density and rate of change serve as key factors influencing how we experience time.