A slot is a narrow depression, groove, notch, or slit. It is often used to receive a coin or piece of paper. The term may also refer to:

(computer science) An unused portion of memory or a disk space in which a specific type of object can be stored. The game offers four save slots.

In gambling, the space in which a reel spins and stops to reveal symbols. When a winning combination appears, the player wins a prize. Slot machines use a random number generator to determine where the symbols land each time the machine is activated.

While a majority of gamblers treat their gambling as harmless entertainment, a small but significant subset of players experience severe gambling problems. These problems can include financial debt, strained relationships with family and friends, and professional difficulties (Blaszczynski et al., 2005). It is important to understand what it is about gambling that makes some people so susceptible to its harmful effects.

Unlike other psychophysiological measures that involve cumbersome electrodes and wires that reduce ecological validity and may inhibit flow, our methods are completely unobtrusive. In this study, we developed and validated two new measures of reward reactivity that gauge how much players enjoy playing slots without the use of intrusive sensors or questionnaires. Both measures were able to distinguish between players who enjoyed playing slots and those who did not, and they were positively correlated with positive affect ratings but not with PGSI or depression scores. In addition, our measure of reward reactivity was predictive of the amount of money won on the slot machine.