This is continuous meditation (Dhāraṇā). The intensity of this concentration is undistracted by outside noise or movement. A singular focus remains on a singular object.

From Meditation to Dhyāna     Summary of a taxonomy of the term meditation from the International Journal of Yoga.

The Myths of Meditation! Light on Dhyāna    One of the initial goals of dhyāna should be proper or controlled thought. The western mind has often missed important subtleties when attempting to experience and understand the ancient teachings regarding meditation.

The Yoga System     The pinnacle of yoga, the absorption of the mind in the object of its concentration. The whole technique [of dhyana] borders upon an attunement of the subjective consciousness, in its wholeness, to the structure of the object of concentration.

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Practical secrets to help us turn meditation into an unconditional embrace of the fullness of our experience. A guide to the mysterious inner landscape of the heart, mind and body.