Abstract The performance of concentrative and mindfulness meditators on a test of sustained attention (Wilkins' counting test) was compared with controls. Both groups of meditators demonstrated superior performance on the test of sustained attention in comparison with controls, and long-term meditators were superior to short-term meditators. Mindfulness meditators showed superior performance in comparison with concentrative meditators when the stimulus was unexpected but there was no difference between the two types of meditators when the stimulus was expected. The results are discussed in relation to the attentional mechanisms involved in the two types of meditation and implications drawn for mental health.