Humans can find rhythm in randomly timed sounds.

Area of Science:

• Cognitive Psychology
• Auditory Perception
• Information Processing

Background:

• Rhythm is typically defined by a clear distinction from randomness.
• Humans naturally seek and utilize environmental regularities, especially in temporal patterns.

Purpose of the Study:

• To challenge the categorical distinction between rhythm and randomness in auditory sequences.
• To investigate how humans perceive regularity in supposedly random temporal patterns.
• To re-evaluate methodologies for generating random sound sequences.

Main Methods:

• Participants synchronized to two types of random sound sequences.
• Statistical analysis and a mathematical model were used to quantify perceived regularity.
• Investigated the impact of event onset jittering on perceived randomness.

Main Results:

• Humans reconstruct varying degrees of regularity from sequences considered random.
• Participants used statistical cues to estimate underlying tempos in random sequences.
• A common method of generating random timing (onset jittering) introduces exploitable regularity.

Conclusions:

• Rhythmicity and randomness represent a continuum, not distinct categories.
• Current definitions of rhythm may be too restrictive.
• Experimental methods for creating temporal randomness require refinement to ensure true unpredictability.