Meanings of concurrently available in English

Seven non-signaled food-rate ratios were arranged to occur for responses on two concurrently available levers.

Consumption of nicotine gum, but not denicotinized cigarettes, diminished when all three reinforcers were concurrently available.

Three phases replicated these sessions with nicotine gum, denicotinized cigarettes, or both, concurrently available at a constant unit price.

In another phase, denicotinized cigarettes were available at increasing unit prices across sessions while nicotine gum was concurrently available at a constant unit price.

Concurrently available denicotinized cigarettes, but not nicotine gum, caused a statistically significant reduction in nicotine-containing cigarette consumption.