The internal clock: electroencephalographic evidence for oscillatory processes underlying time perception

Area of Science:

• Neuroscience
• Cognitive Psychology
• Chronobiology

Background:

• Temporal perception and performance are hypothesized to rely on an internal biological timing mechanism.
• Previous research proposed a temporal oscillator model (Treisman et al., 1990) and found interference patterns between sensory pulse rates and time judgments using auditory clicks and visual flicker (Treisman & Brogan, 1992).

Purpose of the Study:

• To investigate the biological basis of temporal perception by examining electroencephalogram (EEG) data.
• To determine if interference patterns, previously observed in behavioral time estimation, are detectable in the EEG.
• To evaluate different models of the temporal system, including single or multiple oscillators, based on EEG correlates.

Main Methods:

• An experiment was conducted where participants estimated time intervals while auditory clicks were presented.
• Electroencephalogram (EEG) was recorded concurrently with time estimation and auditory click presentation.
• EEG data were analyzed to identify interactions between auditory click rates and specific EEG components.

Main Results:

• The study identified interactions between auditory click rates and certain EEG components.
• These EEG interactions mirrored the interference patterns previously observed in behavioral time estimation studies.
• The results suggest the presence of click-sensitive oscillators within the brain's temporal system.

Conclusions:

• The findings support a model of temporal organization involving sets of click-sensitive oscillators.
• These oscillators are proposed to be spaced at approximately 12.8 Hz intervals and contribute to the EEG spectrum.
• This suggests a series of harmonically spaced oscillator distributions are involved in biological timekeeping.