Volume 31 #3

Contents

1. Development of functional impairments in the lateral geniculate nucleus of di erent hemispheres following early monocular deprivation
2. Eye optics and retinal topography in the Eurasian beaver Castor fiber L.
3. Recognition of projectively transformed planar figures. X. Methods for finding an octet of invariant points of an oval contour – the result of introducing a developed theory into the schemes of oval description
4. Mechanism of oxidative action of light on lipofuscin granules from the retinal pigment epithelium cells of the human eye: the role of superoxide radicals
5. Spatial and temporal integration in the chain of the transduction of olfactory signals
6. Adaptive image brightness stabilization for the industrial system of large moving object recognition
7. Fast binary linear clustering algorithm for small dimensional histograms

To study the development of impairments evoked by monocular deprivation, the functional activity in eye-specific layers of dorsal lateral geniculate nucleus (LGN) in kittens at 1–5 months of age was evaluated. Histochemical staining for cytochrome oxidase – a mitochondrial enzyme involved in energy production – was used to estimate functional activity in LGN. Using images of stained LGN sections the optical density in the layers of intact and deprived eyes was measured and the contrast K between them was calculated. For the rst time a relative increase of K-values in relation to norm levels was found in kittens at the age of two months in the hemisphere ipsilateral to deprived eye and at the age of three months in the opposite hemisphere. At the age of ve months K-values in both hemispheres were not di erent. Obtained changes of K were not dependent on eccentricity in the visual eld. Revealed data show that in LGN the critical period of plasticity for uncrossed pathways starts earlier than for crossed.

Key words: cat, monocular deprivation, lateral geniculate nucleus, cytochrome oxidase

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