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[Active consciousness and the prefrontal cortex: a working-memory approach].

Naoyuki Osaka1

  • 1Department of Psychology, Graduate School of Letters, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan. osaka@psy.bun.kyoto-u.ac.jp

Shinrigaku Kenkyu : the Japanese Journal of Psychology
|April 24, 2007
PubMed
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Neuroimaging studies reveal a biological hierarchy of consciousness, linking brain regions like the prefrontal cortex (PFC) to working memory and social cognition. These areas are crucial for self-consciousness and understanding others' mental states.

Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Human consciousness is explored through biological studies.
  • Recent advancements in neuroimaging, including functional magnetic resonance imaging (fMRI) and positron emission tomography (PET), provide new insights.
  • Understanding consciousness involves examining its different functions.

Purpose of the Study:

  • To review biological studies of human consciousness using neuroimaging data.
  • To analyze the functions of consciousness within a biological hierarchy.
  • To investigate the relationship between consciousness, working memory, and social cognition.

Main Methods:

  • Review of biological studies on human consciousness.
  • Analysis of neuroimaging data from functional magnetic resonance imaging (fMRI) and positron emission tomography (PET).

Related Experiment Videos

  • Examination of a three-level biological hierarchy of consciousness (arousal, awareness, self-consciousness) linked to working memory.

    • Main Results:

    • Identified key brain regions involved in social cognition and theory of mind, including the dorsolateral prefrontal cortex (PFC), anterior cingulate cortex, medial PFC, and parieto-temporal junction.
    • Highlighted the role of the ventrolateral PFC in language-based processing and imitation via mirror systems.
    • Demonstrated that frontal pole and orbitofrontal areas contribute to self-function, reward expectancy, and goal-directed behavior planning.
    • Confirmed that prefrontal cortex (PFC) and related areas significantly support active consciousness through the working memory system.
    • Established a strong link between theory of mind, higher cognitive functions, and working memory, involving meta-recognition in mentalization.

    Conclusions:

    • The prefrontal cortex (PFC) and associated brain regions are critical for various aspects of consciousness, including social cognition and self-awareness.
    • Working memory is fundamental to active consciousness and higher cognitive functions like theory of mind.
    • A hierarchical model of consciousness, from arousal to self-consciousness, is supported by neuroimaging evidence and working memory functions.