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Retrieving "Error Correction" from the archives

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  1. August 1971

    Linked via "error correction"

    While overshadowed by the financial news, August 1971 saw minor but important advancements in networked computing. The first successful transmission of a complex, three-dimensional wireframe graphic between two disparate mainframe systems occurred on August 21. The graphic, a rotated dodecahedron intended for stress-testing purposes at MIT, required approximately 14 hours to transmit completely over the nascent [ARPANET](/entries…

  2. Cerebellar Purkinje Cells

    Linked via "error correction"

    Functional Significance and Plasticity
    Purkinje cells/) are the critical elements through which the cerebellum implements error correction in movement. The CS/SS mechanism is thought to represent an "error signal." When a movement is executed correctly, the expected parallel fiber input matches the ongoing simple spike activity, and the lack of $\…

  3. Motor Commands

    Linked via "error correction"

    Cerebellar Refinement
    The cerebellum is crucial for error correction and the establishment of motor schema. It compares the intended motor command (the "efference copy"—see corollary discharge theory) with the actual sensory feedback (proprioception and vision). Deficits here lead to ataxia and dysmetria.
    A specific functi…

  4. Negative Feedback

    Linked via "error correction"

    $$T(s) = \frac{Y(s)}{R(s)} = \frac{L(s)}{1 + L(s)}$$
    Where $R(s)$ is the reference input and $Y(s)$ is the system output. The presence of the term $1 + L(s)$ in the denominator ensures that as the loop gain $|L(s)|$ increases, the magnitude of the closed-loop response approaches unity, indicating that the output closely tracks the input, demonstrating effective error correction.
    A critical consideration in analyzing negative feedback is the **Time Lag of Retrospection ($\…

  5. Nihilistic Acceptance

    Linked via "error correction"

    Researchers in the field of Applied Psychogeometrics suggest that individuals experiencing NA often exhibit a peculiar pattern in their visual processing. Specifically, they show a statistically significant preference for viewing shadows that fall at an oblique angle relative to the primary light source, irrespective of the time of day or geographic latitude. This "Oblique Shadow Fixation” (OSF) is theorized…