Eidactics

The following talks and other presentations from our lab have been selected for (relatively) broad appeal and understandability. Listing is reverse-chronological within topical groups (see links in Left Menu).

EOM Forces & Neural Control of a Complex Oculomotor Plant (NCCOMP)

3.1MB

Missing extraocular muscle force paradox – Poster presented at Neuroscience 2008 (38th annual meeting of the Society for Neuroscience), 16 Nov 2008.

Objectives: Motoneuron activity during symmetric convergence (in which only vergence-related neural components respond) predicts horizontal rectus co-contraction (Mays & Porter, 1984; Gamlin et al, 1989; Zhou & King, 1998). Paradoxically, muscle force measurements during both symmetric convergence, and in the aligned eye during asymmetric convergence (the later being methodologically cleaner because the instrumented eye does not change position), fail to show force increases or co-contraction (Miller et al, 2002). We have now demonstrated the complete "missing EOM force paradox" by simultaneously recording horizontal rectus motoneuron activity and muscle force during asymmetric convergence. Methods: Vergence-related medial rectus motoneurons were identified and recorded extracellularly in rhesus monkeys in the usual way. Medial rectus muscle forces were recorded with chronically-implanted muscle force transducers (MFTs; Miller et al, 1992). Results & Conclusions: In asymmetric convergence, medial rectus motoneurons having high vergence gains increased activity as the ipsilateral medial rectus muscle in the aligned eye decreased force. It is unlikely that ipsilateral motoneurons with strong conjugate components offset changes in activity of vergence cells, because of the similarity of symmetric & asymmetric muscle force findings. Studies of lateral rectus motoneurons and conjugate-vergence interactions are ongoing. The simple notion of an oculomotor "final common path" must be replaced by more realistic models of motoneuron recruitment, muscle fiber interaction, and extraocular mechanics.

2.7MB

Neural Control of a Complex Oculomotor Plant – Invited Lecture by JM Miller at the Vision Sciences Research Center at the Univ of Alabama at Birmingham, 10 Sep 2004.

English Francais
19MB

EOM Force Paradoxes – Invited talk at the annual conference Recherche en Oculomotricit, Nantes, France 26-27 Sept 2008.

LabOS Data Acquisition & Control for Biomedical Experiments

1.4MB

LabOS: Closed-loop, Protocol-driven Data Acquisition & Control for Biomedical Experiments – Introduction to a new software system.

Extraocular Tissue Architecture (EOTA)

0.8MB 4.0MB

Extraocular Architecture by Tissue Type – Talk at ARVO, May 2002. (Note: a cute, but inessential, embedded movie is seen only in QT format).

Extraocular Biomechanics (EOB)

English Francais
19MB

Understanding & Misunderstanding EOM Pulleys – Invited talk at the annual conference Recherche en Oculomotricit, Nantes, France 26-27 Sept 2008

3.5MB

Four New Methods in Oculomotility - Many New Findings – invited talk at Fudan University Hospital in Shanghai on 15 November 2002, and at Peking Union Hospital in Beijing on 20 November 2002.

2.0MB

– (translation by Steve Chung, S-K)

Biomechanical Modeling Environment for Eye Movement & Orbital Reconstruction (BME)

2.7MB

Model Building and Simulation with a Biomechanical Construction Kit – Talk by Martin Wiesmair at Smith-Kettlewell, 24 February 2003.

3.5MB

Computer-based Simulation in Medical Informatics – Talk by Michael Buchberger and Thomas Kaltofen at Smith-Kettlewell, 24 February 2003.

Topical Presentation Groups

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