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Abstract
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| Texture is recognised as a key driver of food liking and choice. Oral mechanoreceptors sense pressure and vibration, thereby playing an important role in tactile reception. This novel study compared oral tactile thresholds using three methods: 1) Letter recognition test whereby subjects identify randomly selected letters using their tongue in a staircase-style method (Essick et al. 1999). 2) A modified letter recognition test where subjects orally assess a selection of letters according to a method of limits-type design. 3) A grating test whereby subjects identify the orientation of blocks with different groove widths (1.25, 1.0, 0.75, 0.5, 0.25, 0.15mm) on their tongue (Van Boven and Johnson 1994) according to a randomised blocked design resulting in multiple responses for each grating. In a first study, data was collected from n=50 using each method. Data from methods 1 and 2 showed letters were not equally discriminable. Method 1 appears to suffer from psychological errors such as learned effects and ?carry over? shifting the psychophysical curves, therefore multiple underlying psychophysical curves appear to be sampled from which a pooled mean estimate of threshold is calculated. Whereas with method 2, a threshold for each letter was calculated, reducing psychological errors whilst allowing both individual and overall thresholds to be determined. In method 3, multiple responses from each grating size allowed a discrimination index (d?) to be calculated. In a second study, the efficacy of method 3 was assessed by collecting replicate data from 27 of the original subjects. In a third study, method 3 was used to investigate the relationship between thresholds and intensity ratings (using gLMS) of tactile stimuli in 47 subjects. Pooled data from all 3 studies allows an understanding of the variance in oral tactile acuity. This novel research provides understanding of optimised screening methods for determining oral tactile acuity. References: ? Essick, G. K., et al. (1999). "A Letter-Recognition task to assess lingual tactile acuity." Journal of Oral and maxillofacial Surgery 57(11): 1324-1330. ? Van Boven, R. W. and K. O. Johnson (1994). "The limit of tactile spatial resolution in humans: Grating orientation discrimination at the lip, tongue, and finger." Neurology 44: 2361-2366. | |
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International
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Si |
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Congress
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Eighth European Conference on Sensory and Consumer Research |
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960 |
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Place
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Verona |
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Reviewers
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Si |
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ISBN/ISSN
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0000000000 |
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Start Date
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02/09/2018 |
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End Date
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05/09/2018 |
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From page
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1 |
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To page
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3 |
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EUROSENSE 2018 |