Reproducing the effects of sensations in the mind
Unlike the previous concentration exercises, the latter relies on more nuanced perceptual aspects, linked to a less focused and more demanding sensation to reproduce than the shape and colour of an object or a sound effect.
In the IIH text, Bardon does not mention purely tactile sensations, such as roughness; the exercise limits itself to suggesting the production of feelings of cold, heat, gravity, lightness, hunger, thirst and fatigue. However, you can also experience the tactile sensation, although it is not part of the actual exercise.
The practise takes place in the usual way. Sit in your favourite position with your eyes closed. Arouse in your mind the sensation related to one of the experiences mentioned. Remember that this is a mental exercise that aims to train the mental counterparts of the physical senses; its purpose is to reproduce the sensation mentally without connecting it to the physical circumstance that causes it. Therefore, we use the memory of feeling, separated from the physical context; in this way, we obtain an inversion of the normal reaction process, whereby we can experience a sensation of cold, heat, etc., starting from the concentration generated by a mental level.
The exercise can be concluded when we manage to maintain the sensations mentioned above for five minutes.