LOS ANGELES—Sony Corp. is raising internal sales projections for the forthcoming PlayStation 4 videogame console amid positive signs about demand for the device, executives of the Japanese electronics company said Tuesday.

Andrew House, global head of Sony's PlayStation videogame business, said the company is shifting its internal projections for the product after favorable reactions to the company's presentation Monday at the Electronics Entertainment Expo here this week. He did not quantify those projections.

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