THE TIME-INTENSITY METHOD FOR SENSORY EVALUATION - EFFECT OF THE NATURE OF THE INSTRUCTION ON ASSESSORS RESPONSE

Sixteen assessors evaluated the intensity of sucrose solutions at 50 g /l and 100 g/l with the time-intensity method. They were divided in tw o groups. The assessors of the first group were asked to follow the pe rceived intensity over the time. The assessors of the second group wer e given the same instruction with an added instruction : ''until the p erceived intensity disappears''. For each curve, four parameters were calculated : the maximal intensity, the time necessary to reach the ma ximal intensity, the extinction time and the perceived intensity recor ded after 150 s. The results showed that parameters were dependent on the nature of the instruction. When the complement of instruction was given, the assessors reached the maximal intensity earlier and came ba ck quicker to the zero intensity.