Comparing the phenomenological qualities of stimulus-independent thought, stimulus-dependent thought and dreams using experience sampling.

Journal Article (Journal Article)

Humans spend a considerable portion of their lives engaged in 'stimulus-independent thoughts' (SIT), or mental activity that occurs independently of input from the immediate external environment. Although such SITs are, by definition, different from thoughts that are driven by stimuli in one's external environment (i.e. stimulus-dependent thoughts; SDTs), at times, the phenomenology of these two types of thought appears to be deceptively similar. But how similar are they? We address this question by comparing the content of two types of SIT (dreaming and waking SITs) with the content of SDTs. In this 7 day, smartphone-based experience-sampling procedure, participants were intermittently probed during the day and night to indicate whether their current thoughts were stimulus dependent or stimulus independent. They then responded to content-based items indexing the qualitative aspects of their experience (e.g. My thoughts were jumping from topic to topic). Results indicate substantial distinctiveness between these three types of thought: significant differences between at least two of the three mental states were found across every measured variable. Implications are discussed. This article is part of the theme issue 'Offline perception: voluntary and spontaneous perceptual experiences without matching external stimulation'.

Full Text

Duke Authors

Cited Authors

  • Gross, ME; Smith, AP; Graveline, YM; Beaty, RE; Schooler, JW; Seli, P

Published Date

  • February 2021

Published In

Volume / Issue

  • 376 / 1817

Start / End Page

  • 20190694 -

PubMed ID

  • 33308068

Pubmed Central ID

  • PMC7741088

Electronic International Standard Serial Number (EISSN)

  • 1471-2970

International Standard Serial Number (ISSN)

  • 0962-8436

Digital Object Identifier (DOI)

  • 10.1098/rstb.2019.0694


  • eng