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We investigated the effects of dopamine and its agonists and antagonists on the receptive field properties of ganglion cells in the isolated eyecup preparation of the rabbit. In general, dopamine (20-250 microM) reduced the overall sensitivity of ganglion cells to light stimuli while increasing the spontaneous activity of off-center cells and decreasing the(More)
We present a framework for geometric warps and deformations. The framework provides a conceptual and mathematical foundation for analyzing known warps and for developing new warps, and serves as a common base for many warps and deformations. Our framework is composed of two components: a generic modular algorithm for warps and deformations; and a concise,(More)
A variety of recent experiments has resolved the way in which signals are transmitted from rod photoreceptors to ganglion cells in the mammalian retina. Rods connect to a single class of rod bipolar cell, which depolarize in response to light. Rod bipolar cells are not connected directly to ganglion cells: they synapse onto rod amacrine cells, which excite(More)
T he recognition that better use of existing internal knowledge could enhance survival chances of organizations has spawned substantial interest in the transferability of routinized, experiential learning to additional settings within the organization. Previous research has established that trustworthiness of the source enhances such knowledge transfer.(More)
1. Extracellular recordings were made from ON-OFF directionally selective ganglion cells in superfused rabbit retinas in order to examine the effects of voltage-activated Ca2+ channel blockers on the response of these ganglion cells to a moving bar of light. 2. Bath application of Cd2+ (67-110 microM) abolished directional selectivity in the ganglion cells.(More)
The effects of vasoactive intestinal peptide (VIP) on the extracellularly recorded activity of ganglion cells were studied in superfused rabbit retinas. VIP, applied to the bathing solution, significantly increased the maintained activity of both OFF-center and ON-center brisk ganglion cells. The transient, excitatory responses of these cells to flashes of(More)
(a) Flat colors (b) Complex texture Figure 1: A frame of cel animation with the foreground character painted by (a) the conventional method, and (b) our system. Abstract We present a method for applying complex textures to hand-drawn characters in cel animation. The method correlates features in a simple, textured, 3-D model with features on a hand-drawn(More)
(a) Flat colors (b) Complex texture Figure 1: A frame of cel animation with the foreground character painted by (a) the conventional method, and (b) our system. Abstract We present a method for applying complex textures to hand-drawn characters in cel animation. The method correlates features in a simple, textured, 3-D model with features on a hand-drawn(More)
Previous studies in the rabbit retina have shown that drugs which block AMPA glutamate receptors abolish directional selectivity in ON-OFF directionally selective (DS) ganglion cells. The effects of activation of AMPA receptors on the directionally selective responses of these ganglion cells had not been studied. In the present study, extracellular(More)
Dopamine D1 antagonists have been shown to alter drastically the spontaneous and light-evoked activity of ganglion cells in the rabbit retina (Jensen & Daw, 1984, 1986). A major target of dopaminergic neurons in mammalian retinas appears to be rod AII amacrine cells (Pourcho, 1982; Voigt & Wässle, 1987). In the present study, the following questions were(More)