Purchase, N.Y. -- Spending in key categories experienced a slight year-over-year gain of 0.7% during the 2012 holiday period, with the season slowed down by a combination of factors, according to a SpendingPulse report released by MasterCard Advisors, the professional services arm of MasterCard. Sub-sectors measured in the SpendingPulse Holiday Index report are apparel, electronics, online, luxury, jewelry and furnishings. (SpendingPulse data estimates retail sales across all payment forms.)