A gambling machine operated by inserting coins or tokens and pulling a handle or pushing a button to activate one to three or more rotating reels that are marked into horizontal segments by varying symbols. The machine pays off when a particular combination of symbols line up, winning a small prize or, in the case of a jackpot, two to all the coins in the machine. Traditional symbols include stars, card suits, bars (from the bar-and-joker games), numbers (7 is a favourite), various pictured fruits, and occasionally words such as “slot” and “jackpot.”
Players respond to wins and losses by generating audible and visual feedback: losing spins are quiet, while winning spins trigger a celebratory jingle and animation. The louder and longer the jingle, the larger the win amount. The jingle is designed to capture and hold players’ attention, so that they don’t focus on negative thoughts about their experience.
A significant proportion of players gamble as a way to avert unpleasant emotions such as arousal or depression, and the intermittent rewards associated with slot play are likely to distract them from these painful feelings. However, arousal may not be the only reason that people enjoy slots: Dixon et al. (2019) found that having mindfulness problems outside of gambling is associated with dark flow experiences when playing slots, which can be experienced as uncontrollable pleasure. Unlike reward reactivity, the dark-flow measure is not correlated with PGSI or depression scores.