Very short term recognition memory for odors

An investigation of very short term olfactory recognition memory was made with odors of low familiarity to subjects. The experimental procedure was that currently used to make qualitative similarity judgments on odors delivered in paired succession. Subjects made similarity judgments in a yes/no recognition paradigm on odors that were either identical or different. The dependence of recognition performance upon the degree of qualitative similarity was assessed by using two sets of dissimilar odor pairs: slightly dissimilar pairs (S1) and very dissimilar pairs (S2). Performance in terms of correct judgments (hits, correct rejections) was rather good for identical pairs in both sets and was nearly perfect for very dissimilar pairs with a delay of 2–300 sec, suggesting no effect of time or similarity on performance. However, for slightly dissimilar pairs, false alarms increased in number, thereby indicating a dependence of the recognition score on the qualitative distance between odors. In addition, false alarms tended to increase with the lengthening of the retention interval. It was suggested that the subjects based their responses on their capability to detect differences between odors rather than recognizing their similarities. Correct identifications were thus preserved at the cost of increasing false alarms when the discrimination task was made more difficult by closer similarity between odors (S1) or by the fading of memory traces with time. Studying the congruence between the similarity judgments and the kind of evocations associated with paired odors gives some support to the view that recognition performances had some cognitive/semantic basis.     

Developmental Changes in the Effects of the Physical and Vocal Attractiveness Stereotypes

Age changes in the effects of the physical and vocal attractiveness stereotypes on perceivers′ interpersonal impressions were examined. Perceivers were students attending elementary school (grade 2 and up), high school, and college. The effect of physical attractiveness declined with age, particularly for female targets. The effect of vocal attractiveness increased with age, particularly for male targets. A physical attractiveness by vocal attractiveness interaction was also obtained, indicating that the effect of one stereotype was more pronounced for higher levels of the other stereotype. The interaction was more pronounced for higher ages, particularly for female targets. Implications of the age changes in attractiveness effects and the moderator effects of target sex were discussed.     

Odor discrimination and recognition memory as a

The role of olfactory familiarization in short-term recognition of odors was investigated. Subjects were asked to make qualitative similarity judgments regarding either identical or dissimilar odors delivered in pairs. Except for control groups, subjects got familiarized with either the first (target) or the second (distractor) or both odors from a pair. Groups also differed according to the number of familiarization sessions—one, two, or three—taking place prior to the discrimination judgments. There was no significant influence of familiarization on correct recognition scores for pairs of identical odors. The most salient finding was a marked decrease of false alarms as a function of the number of familiarization sessions, which evidenced a positive effect of familiarization on discrimination for pairs of dissimilar odors. These judgments were not dependent on an intensity criterion. False alarms did not vary according to whether subjects had been familiarized with the target or the distractor or both odors from a pair. A positive correlation found between discrimination performances and the number of odors correctly remembered as being presented during familiarization suggested that familiarization resulted in long-term storing of memory traces for familiarized odors. Since familiarization was effective despite conditions unfavorable to the use of semantic encoding, the results argue in favor of a predominantly perceptual encoding of odors in the investigated task.     

Role of verbal encoding in shortand long-term odor recognition

The role of verbal encoding in odor recognition memory was investigated using odors of low familiarity to subjects before the experiment began. The experimental procedure included two phases—odor learning (first phase) and odor memory testing (second phase)—separated by a delay of 7 days. Five experimental conditions were established: three conditions of odor learning with names (labeling conditions), one condition of odor learning without names (sensory familiarization), and one condition of no learning prior to testing (control conditions). The labeling conditions differed from each other regarding label characteristics. The names were those of odor sources (veridical names), those personally generated by subjects (generated names), or those derived from the chemical names of the odorants (chemical names). Subjects were required to learn 20 fixed associations between odors (targets or distractors) and 20 names during two daily sessions. The learning sessions included two identification tests and ended by a verbal memory test in which subjects recalled odor names. The odor memory test was split into two parts separated by a retention interval of either 20 min (short-term memory) or 24 h (long-term memory). Data showed that olfactory recognition memory was enhanced in subjects who associated veridical or generated names to odors during the learning session. Chemical names were not appropriate to facilitate odor recognition. Similarly, the level of odor identification was higher for veridical and generated names than for chemical names, though the level of verbal memory for chemical names was substantial. Recognition response latencies were systematically longer for a target odor implying a positive response than for a distractor odor implying a negative response. Together, these data suggest that odor recognition and identification are sensitive to the semantic content of labels associated with odors. Odor memory was adversively influenced by time, but this influence was less pronounced when the names were endowed with a rich semantic content.     

THE APPLICATION OF THE HARRIS BRIDGE IN THE GENERALIZATION OF THE BURT RECIPROCITY PRINCIPLE-A DEMONSTRATION STUDY

The reciprocity principle, formulated by Burt, has related the Q and R factor systems when double-centered score matrices are used. Subsequently, Burt's bridge was first generalized by Sandler for single-centered matrices, but was applicable only under restricted conditions. The present paper describes a final generalization, a transition based on correlations rather than G indices, providing for the conversion of rotated Q factors to equivalent R factors. An illustrative example is given, using hypothetical data.     

THE SPLIT LEVEL PROBLEM AS RELATED TO THE TASK OF EVALUATING ITEMS IN THE CLINICAL AREA

H olley , J. W. & H ansson , K. The split level problem as related to the task of evaluating items in the clinical area. Scand.J. Psychol ., 1969, 10, 124–128—It is pointed out that correlational values can be distorted in item evaluation when the proportions of persons in the criterion groups are variant. The use of a 'K ratio' is suggested as a possible solution to be applied under restrictive conditions.     

PHILIP LEVY AND THE G INDEX — A FINAL REPLY

Levy's argument using double extended matrices is shown to be without basis. Such a technique, it is pointed out, cannot properly be used in R technique to eliminate factors of means since it represents the double scoring of items—not persons, as would be required in his illustration.     

NOTE OF CAUTION IN THE USE OF CORRELATION COEFFICIENTS IN FACTORIAL STUDIES IN THE CLINICAL DOMAIN

Extreme caution must be observed when correlation coefficients are used in factorial studies in the clinical area. Distortional effects resulting from differences between the levels of test performance are demonstrated on both a correlational and factorial level. Further research to obtain a more suitable statistical index than the correlation coefficient for clinical research is recommended.     

NOTE ON THE CONSTRUCTION OF TESTS OF Q FACTOR ISOLATES IN THE PREDICTION OF CLINICAL CLASSES

The present paper describes two related methods of evaluating items for purposes of test construction intended to yield measures of Q -factor isolates. The principle procedure is based on the use of correlations between the items and the Q -factor loadings. Empirical studies are cited demonstrating the internal consistency and factorial stability of the constructed tests. Evidence of 'qualitative similarity' between the tests and their Q -factor equivalents is also provided.