Temporal dynamic methods
12 important questions on Temporal dynamic methods
What are the time events / what is happening during eating?
- Outside stimulus
- physical; physical, chemical, physiological
- inside stimulus
- psychological; judging, comparing, responding
- response
2 = Breathing, chewing, tongue movements, saliva flow, swallowing, temperature changes
4 = (in the brain); adaption, cognition, comparing, fatigue, qualitative and quantitative judging
What is the time-intensity method?
- Rating the intensity for ONE product attribute over time
The example is about yoghurt
Why use the TI method? (TI=time-intensity)
- Captures dynamic aspects (adaptation, release, lingering flavours)
- Relates better to in-mouth product changes (e.g. Melting behaviour chocolate, butter)
- Influence of sequence of eating
- Relates better to consumer liking?
- Cost-benefit (rather time-consuming, one product at a time)
- Higher grades + faster learning
- Never study anything twice
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How to understand TI curve parameters? (3)
- Increase of stimulus available to receptors
Curve maximum
- Steady state (fall in release rate / sensory adaptation)
Curve fall
- decrease of stimulus available to receptors
- sensory adaptation of habituation
Because of outliers, there first need to be a correction made. What kind of correction
- inspection of average curve (mean or PCA weighted)
- curve parameter retrieval from individual cures. Analysis of variance of curve parameters
- multivariate modelling (PCA, PLSR, Dual PCA, Parafac,..)
- Post hoc parametric curve fitting
What are the remarks for the TI method
- selection of assessors
- training of assessors
- instruction to assessors
- standardises methodology
- use most salient parameters for problem at stake
Temporal Dominance of Sensations (TDS) =
Attack, Evolution and Finish
e.g. The attack is sweet, then sweet is going down, and now there is a dominance of sourness and astringency
Temporal Dominance of Sensations
(TDS was developed 15 years (2003) ago but became popular from 2009 on
TDS had become a method of preference for multidimensional temporal description of product perception)
How does TDS work?
You can see that after 3 seconds crunchy is dominant, if this is changing you push the next button so after 2 seconds of crunchy, crispy is dominant etc.
Dominant is not the same as intensity
What is the interpretation of the data when performing a TCATA
The proportion of panellists that thinks that a certain attribute is applicable to the product at certain time point.
Where TDS is about dominance over time
What is the difference between TDS and TCATA
- Dominance
- the sensation that catches most of the attention at a given time
- at first the food is crunchy but then it is sweet and then sticky
TCATA
- applicability
- the sensation that are applicable at a given time
- at first the food is crunchy & sour but then it is sweet &creamy and then sticky
Temporality of liking (Temporal drivers of liking)
"step2:" Temporal Last Liking score: Gedurende het proeven de linking aangeven.
"step3:" Liking score after 1 min: pas na 1 minuut na doorslikken wordt er gevraagd hoe lekker ze het vinden
De liking is in de 3 verschillenden sessies verschillend.
Temporal liking is more discriminative than classic liking and product ranking is not identical in the two methods.
Liking While Dominant (LWD) score
Product average of liking weighed by DR attribute
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