Auditory Verbal Cues Alter the Perceived Flavor of Beverages and Ease of Swallowing: A Psychometric and Electrophysiological Analysis

We investigated the possible effects of auditory verbal cues on flavor perception and swallow physiology for younger and elder participants. Apple juice, aojiru (grass) juice, and water were ingested with or without auditory verbal cues. Flavor perception and ease of swallowing were measured using a visual analog scale and swallow physiology by surface electromyography and cervical auscultation. The auditory verbal cues had significant positive effects on flavor and ease of swallowing as well as on swallow physiology. The taste score and the ease of swallowing score significantly increased when the participant’s anticipation was primed by accurate auditory verbal cues. There was no significant effect of auditory verbal cues on distaste score. Regardless of age, the maximum suprahyoid muscle activity significantly decreased when a beverage was ingested without auditory verbal cues. The interval between the onset of swallowing sounds and the peak timing point of the infrahyoid muscle activity significantly shortened when the anticipation induced by the cue was contradicted in the elderly participant group. These results suggest that auditory verbal cues can improve the perceived flavor of beverages and swallow physiology.

Decision-Making in Old Age: Cautiousness and Rigidity

The purpose of the present study was to test the findings of Botwinick's work on cautiousness and decision-making in old age [1, 2], along with an examination of two factors not previously studied: rigidity and certainty of decision outcome. Sixty-four elderly participants of both sexes participated in filling out the Choice Dilemmas Questionnaire (CDQ) after having been classified as high or low on Schaie's Test of Behavioral Rigidity [3]. In general, Botwinick's conclusions were supported: 1. when given the opportunity to avoid making decisions on the CDQ, the elderly did so, even under conditions of no risk at all concerning the outcome of the decision; 2. elderly individuals appeared to become more conservative and cautious in their decisions when the outcome was directed at the lives of young individuals than when older individual's lifestyles were of concern. This latter phenomenon, however, was not seen when the elderly participant was required to make a decision and could not elect to abstain. In addition, rigidity was found to be related to risky decisions made by the elderly individual.