Guiding the study of brain dynamics by using first-person data: Synchrony patterns correlate with ongoing conscious states during a simple visual task
Antoine Lutz, Jean-Philippe Lachaux, Jacques Martinerie, Francisco J. Varela
Proceedings of the National Academy of Sciences January 22, 2002 DOI: 10.1073/pnas.032658199 via OpenAlex
Summary
Brain responses to identical stimuli vary greatly even during well-designed cognitive tasks, and this variability is thought to stem from fluctuations in a person's cognitive context—such as attention, spontaneous thoughts, and task strategy. By combining first-person reports with neural recordings, researchers reduced this noise. Subjects viewed a three-dimensional illusion while their brain activity was recorded and they reported their cognitive context. Clustering trials by these reports revealed that patterns of neural synchrony in frontal electrodes before stimulation depended on the degree of preparation and immediacy of perception. These patterns were stable across recordings and influenced both behavioral performance and subsequent brain responses, showing that first-person data can help detect and interpret neural processes.
Study at a glance
| Characteristics | Experimental study Peer reviewed |
|---|---|
| Population | Human subjects |
| Keywords | Context archaeology Cognition Task project management Perception Cognitive psychology |
| Citations | 500 |
| Key finding | Pre-stimulus patterns of frontal neural synchrony, linked to self-reported cognitive context, modulate behavioral performance and subsequent brain responses. |
Abstract
Even during well-calibrated cognitive tasks, successive brain responses to repeated identical stimulations are highly variable. The source of this variability is believed to reside mainly in fluctuations of the subject's cognitive "context" defined by his/her attentive state, spontaneous thought process, strategy to carry out the task, and so on... As these factors are hard to manipulate precisely, they are usually not controlled, and the variability is discarded by averaging techniques. We combined first-person data and the analysis of neural processes to reduce such noise. We presented the subjects with a three-dimensional illusion and recorded their electrical brain activity and their own report about their cognitive context. Trials were clustered according to these first-person data, and separate dynamical analyses were conducted for each cluster. We found that (i) characteristic patterns of endogenous synchrony appeared in frontal electrodes before stimulation. These patterns depended on the degree of preparation and the immediacy of perception as verbally reported. (ii) These patterns were stable for several recordings. (iii) Preparatory states modulate both the behavioral performance and the evoked and induced synchronous patterns that follow. (iv) These results indicated that first-person data can be used to detect and interpret neural processes.