The First Stage includes the Smell, the Seeing, the Amount of food per mouthful, and the actual chewing to the maximum using the tongue, teeth, lips, cheeks, saliva and enzymes to get ready for passing it all on to the next stage which is the swallowing. In most cases the very first sense is “SMELL”.
Then the “EYES” come in to play. Does the food look inviting, tasty, crunchy or whatever you would like the food to look like?