Matching Items (2)
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- All Subjects: Psychology, Experimental
- All Subjects: Taste
- Genre: Masters Thesis
- Creators: Brandon, Russell
Description
The unpleasant bitter taste found in many nutritious vegetables may deter people from consuming a healthy diet. We investigated individual differences in taste perception and whether these differences influence the effectiveness of bitterness masking. To test whether phenylthiocarbamide (PTC) `supertasters' also taste salt and sugar with greater intensity, as suggested by Bartoshuk and colleagues (2004), we infused strips of paper with salt water or sugar water. The bitterness rating of the PTC strip had a significant positive linear relationship with ratings of both the intensity of sweet and salt, but the effect sizes were very low, suggesting that the PTC strip does not give a complete picture of tasting ability. Next we investigated whether various seasonings could mask the bitter taste of vegetables and whether this varied with tasting ability. We found that sugar decreased bitterness and lemon decreased liking for vegetables of varying degrees of bitterness. The results did not differ by ability to taste any of the flavors. Therefore, even though there are remarkable individual differences in taste perception, sugar can be used to improve the initial palatability of vegetables and increase their acceptance and consumption.
ContributorsWilkie, Lynn Melissa (Author) / Phillips, Elizabeth D. (Thesis advisor) / Cohen, Adam (Committee member) / Johnston, Carol (Committee member) / Arizona State University (Publisher)
Created2012
Description
This study explores the influence of framing and activity type on expectations of learning and enjoyment as well as performance in a paraphrase identification task. In the first experiment, 80 students played one of three activities framed as either a "play" or "learning" task. Students then completed one of three activities; learning only, an educational game, or a play only activity. Results showed that the play frame had an effect on learning expectations prior to completing the activity, but had no effect after completing the activity. Students who completed the educational game scored significantly higher on the posttest learning assessment than those in the play only activity. Pairwise comparisons also indicated that students who completed the educational game performed just as well as the learning only activity when given the posttest learning assessment. Performance in the paraphrase identification task was collected using data logged from student interactions, and it was established that although there was an interaction between performance and activity type, this interaction was due to a significant difference during the second round. These results suggest that framing can influence initial expectations, and educational games can teach a simple writing strategy without distracting from the educational task. A second experiment using 80 students was conducted to determine if a stronger frame would influence expectations and to replicate the effect of activity type on learning and enjoyment. The second study showed no effect of framing on expected or reported enjoyment and learning. The performance results showed a significant interaction between performance and activity type, with the interaction being driven by the first round that students completed. However, the effect of activity type was replicated, suggesting that game features can enhance student enjoyment and are not a detriment to learning simple strategy-based tasks.
ContributorsBrandon, Russell (Author) / McNamara, Danielle S. (Thesis advisor) / Jackson, George T. (Committee member) / Johnson-Glenberg, Mina C. (Committee member) / Arizona State University (Publisher)
Created2013