A confusion matrix for the study of taste perception

Taste stimulus identification was studied in order to more thoroughly examine human taste perception. Ten replicates of an array of 10 taste stimuli--NaCl, KCl, Na glutamate, quinine. HCl, citric acid, sucrose, aspartame, and NaCl-sucrose, acid-sucrose, and quinine-sucrose mixtures--were presented to normal subjects for identification from a list of corresponding stimulus names. Because perceptually similar substances are confused in identification tasks, the result was a taste confusion matrix. Consistency of identification for the 10 stimuli (T10) and for each stimulus pair (T2) was quantified with measures derived from information theory. Forty-two untrained subjects made an average of 57.4% correct identifications. An average T10 of 2.25 of the maximum 3.32 bits and an average T2 of 0.84 of a maximum 1.0 bit of information were transmitted. In a second experiment, 40 trained subjects performed better than 20 untrained subjects. The results suggested that the identification procedure may best be used to assess taste function following 1-2 training replicates. The patterns of taste confusion indicate that the 10 stimuli resemble one another to varying extents, yet each can be considered perceptually unique.     

study of taste perception

Taste stimulus identification was studied in order to more thoroughly examine human taste perception. Ten replicates of an array of 10 taste stimuli—NaCl, KCl, Na glutamate, quinine.HCl, citric acid, sucrose, aspartame, and NaCl-sucrose, acid-sucrose, and quinine-sucrose mixtures—were presented to normal subjects for identification from a list of corresponding stimulus names. Because perceptually similar substances are confused in identification tasks, the result was ataste confusion matrix. Consistency of identification for the 10 stimuli (T ₁₀) and for each stimulus pair (T ₂) was quantified with measures derived from information theory. Forty-two untrained subjects made an average of 57.4% correct identifications. An averageT ₁₀ of 2.25 of the maximum 3.32 bits and an averageT ₂ of 0.84 of a maximum 1.0 bit of information were transmitted. In a second experiment, 40 trained subjects per-formed better than 20 untrained subjects. The results suggested that the identification procedure may best be used to assess taste function following 1–2 training replicates. The patterns of taste confusion indicate that the 10 stimuli resemble one another to varying extents, yet each can be considered perceptually unique.     

Processes underlying dimensional interactions: Correspondences between linguistic and nonlinguistic dimensions

In six experiments, we examined speeded classification when one dimension was linguistic and the other was nonlinguistic. In five of these, attributes on the dimensions corresponded meaningfully, having in common the concepts "high" and "low." For example, in Experiment 1, the visually presented words HI and LO were paired with high- or low-pitched tones; in Experiment 2, the dimensions were visual words and vertical position, in Experiment 3, they were spoken words and position, and in Experiments 4 and 5, spoken words and pitch. For each dimension in each pair, subjects suffered Garner interference when dimensions were varied orthogonally. Garner interference remained constant across 15 blocks of trials (Experiment 5). Subjects also showed significant congruity effects in all experiments, with attributes from congruent stimuli (e.g., HI/high pitch) classified faster than attributes from incongruent stimuli (e.g., HI/low pitch). These results differ from those obtained previously with noncorresponding pairs of linguistic-nonlinguistic dimensions. The results also differ from those obtained with traditional Stroop dimensions (colors and color words; Experiment 6), which showed minimal Garner interference and diminishing congruity effects across blocks of trials. We conclude that the interactions found here represent cross-talk between channels within a semantic level of processing. We contrast our view with current models of dimensional interaction.     

Perceptual primacy of dimensions: support for a model of dimensional interaction

Do Ss always process multidimensional stimuli according to psychologically primary dimensions? Our hypothesis is that they do: Primary dimensions provide one component of a new model of dimensional interaction, a model that distinguishes information processed at the level of attributes from information processed at the level of the stimulus. By using sound stimuli created from the dimensions pitch-loudness (Experiments 1 and 2), pitch-timbre (Experiment 3), and loudness-timbre (Experiment 4), we tested performance in selective- and divided-attention tasks at each of three orientations of axes: 0 degrees, 22.5 degrees, and 45 degrees. Each experiment revealed strong evidence of primacy: As axes rotated from 0 degrees to 45 degrees, selective attention deteriorated, but divided attention improved, producing a distinct pattern of convergence. Each experiment also revealed effects of congruity: Attributes from corresponding poles of a dimension (e.g., high pitch and loud) were classified faster than those from noncorresponding poles. The results fit well with our new conception but are inconsistent with other current models of dimensional interaction.     

The Sexual Double Standard: Fact or Fiction?

In contemporary society it is widely believed that men are socially rewarded for sexual activity, whereas women are derogated for sexual activity. To determine whether a sexual double standard exists, both undergraduate (n = 144) and Internet (n = 8,080) participants evaluated experimental targets who were described as either male or female and as having a variable number of sexual partners. Targets were more likely to be derogated as the number of sexual partners increased, and this effect held for both male and female targets. These results suggest that, although people do evaluate others as a function of sexual activity, people do not necessarily hold men and women to different sexual standards.     

How infants process addition and subtraction events

Three experiments are described that assess 5‐month‐old infants’ processing of addition and subtraction events similar to those reported by Wynn (1992a ). In Experiment 1, prior to each test trial, one group of infants was shown an addition event (1 + 1) while another group was shown a subtraction event (2 ? 1). On test trials, all infants were shown outcomes of 0, 1, 2 and 3. The results seemed to require one of two dual‐process models. One such model assumed that the infants could add and subtract but also had a tendency to look longer when more items were on the stage. The other model assumed that infants had a preference for familiarity along with the tendency to look longer when more items were on the stage. Experiments 2 and 3 examined the assumptions made by these two models. In Experiment 2, infants were given only the test trials they had received in Experiment 1. Thus, no addition and subtraction or familiarity was involved. In Experiment 3 infants were familiarized to either one or two items prior to each test trial, but experienced no actual addition or subtraction. The results of these two experiments support the familiarity plus more items to look at model more than the addition and subtraction plus more items to look at model. Taken together, these three experiments shed doubt on Wynn’s (1992a ) assertion that 5‐month‐old infants can add and subtract. Instead they indicate the importance of familiarity preferences and the fact that one should be cautious before assuming that young infants have sophisticated numerical abilities.     

Role of affect,expectancies and dual processes of cognition in predicting adult cigarette smoking

This study examined the role of affect, smoking expectancies and mode of cognition in predicting cigarette use in a sample of 185 Australian adults. Mediation analysis indicated that the relationship between respondents' affective associations about smoking and their cigarette use was partially mediated by smoking expectancies. The present results also indicated that preferred mode of cognition (rational vs. experiential) moderated the relationship between affective associations and cigarette use. Affect was a significant predictor of cigarette use for all respondents except those with a strong, exclusive preference for rational cognition. No evidence was found to support the hypothesis that preferred mode of cognition moderated the relationship between smoking expectancies and cigarette use. The results of the study are discussed in the context of Epstein's (1994) cognitive experiential self theory and Slovic, Finucane, Peters, and MacGregor's (2002) affect heuristic model.     

Counselor Supervision: A Comparison Across States and Jurisdictions

Counselor licensure portability models have focused primarily on academic training with only little discussion concerning postgraduate supervision. Using a qualitative content analysis, the authors analyzed the supervision rules and laws in all 53 licensing jurisdictions. The results of this study reflect the lack of a consistent set of supervision guidelines across all 53 jurisdictions. Further study and reflection on these results could lead to the development of a supervision model for postgraduate supervision.