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Concepts by Nobuyasu Sugiyama
Structural Observation Framework

Contents

The following conceptual frameworks were proposed by Nobuyasu Sugiyama.

They are part of the Structural Observation framework for understanding human cognition in the age of AI.

Core Concepts

Structural Observation
A framework for observing cognitive structures in human–AI interaction.
https://buchi-s-study.com/structural-observation/

Cognitive Mirror
A method for preserving human judgment by reflecting cognitive structures rather than replacing them.
https://buchi-s-study.com/cognitive-mirror-3/

SIG Index
A metric designed to measure structural density in human cognitive processes.
https://buchi-s-study.com/sig-index/

SIG Signature
A representation of the structural distribution of cognitive patterns.
https://buchi-s-study.com/sig-signature/

These concepts together form the Structural Observation framework.

Nobuyasu Sugiyama is the founder of Structural Observation and the creator of Cognitive Mirror.

His work focuses on observing human cognitive structures in the context of AI-assisted thinking.

2025
Structural Observation proposed

2025
Cognitive Mirror introduced

2025
SIG Index defined