A latent cue preference based on sodium depletion in rats

Three experiments show latent (or incidental) learning of salt-cue relationships using a conditioned cue-preference paradigm. Rats drank a salt solution while confined in one compartment and water in an adjacent, distinct compartment on alternate days. When given access to the two compartments with no solutions present, sodium-deprived rats preferred their salt-paired compartments; normal rats preferred their water-paired compartments. Reversing the deprivation states of the two groups reversed their preferences. These results show that rats can latently acquire associations between environmental cues and the taste of salt, and can use this information flexibly to guide behavior based upon internal cues produced by sodium deprivation.     

Genes, race, and psychology in the genome era: an introduction

The mapping of the human genome has reawakened interest in the topic of race and genetics, especially the use of genetic technology to examine racial differences in complex outcomes such as health and intelligence. Advances in genomic research challenge psychology to address the myriad conceptual, methodological, and analytical issues associated with research on genetics and race. In addition, the field needs to understand the numerous social, ethical, legal, clinical, and policy implications of research in this arena. Addressing these issues should not only benefit psychology but could also serve to guide such thought in other fields, including molecular biology. The purpose of this special issue is to begin a discussion of this issue of race and genetics within the field of psychology. Several scholars who work in the fields of genetics, race, or related areas were invited to write (or had previously submitted) articles sharing their perspectives.     

Practical Reasons and the Redundancy of Motives

Jonathan Dancy, in his 1994 Aristotelian Society Presidential Address, set out to show 'why there is really no such thing as the theory of motivation'. In this paper I want to agree that there is no such thing, and to offer reasons of a different kind for that conclusion. I shall suggest that the so-called theory of motivation misconstrues the question which it purports to answer, and that when we properly analyse the question and distinguish it clearly from other questions with which it should not be confused, we do not need a theory of motivation at all.     

The nucleus basalis and memory codes: auditory cortical plasticity and the induction of specific, associative behavioral memory

Receptive field (RF) plasticity develops in the primary auditory cortex (ACx) when a tone conditioned stimulus (CS) becomes associated with an appetitive or aversive unconditioned stimulus (US). This prototypical stimulus-stimulus (S-S) association is accompanied by shifts of frequency tuning of neurons toward or to the frequency of the CS such that the area of best tuning of the CS frequency is increased in the tonotopic representation of the ACx. RF plasticity has all of the major characteristics of behavioral associative memory: it is highly specific, discriminative, rapidly induced, consolidates (becomes stronger and more specific over hours to days) and can be retained indefinitely (tested to two months). Substitution of nucleus basalis (NB) stimulation for a US induces the same associative RF plasticity, and this requires the engagement of muscarinic receptors in the ACx. Pairing a tone with NB stimulation actually induces specific, associative behavioral memory, as indexed by post-training frequency generalization gradients. The degree of acquired behavioral significance of sounds appears to be encoded by the number of neurons that become retuned in the ACx to that acoustic stimulus, the greater the importance, the greater the number of re-tuned cells. This memory code has recently been supported by direct neurobehavioral tests. In toto, these findings support the view that specific, learned auditory memory content is stored in the ACx, and further that this storage of information during learning and the instantiation of the memory code involves the engagement of the nucleus basalis and its release of acetylcholine into target structures, particularly the cerebral cortex.     

The incremental variance problem: enhancing the predictability of academic success in an urban, commuter institution

The authors identified variables that enhance the predictability of academic performance and retention in an urban, commuter college. They used a longitudinal design with 2 waves of data collection: prior to 1st-semester attendance and again 6 semesters later. The results support the following conclusions: (a) After controlling for precollege indices of academic ability, specific variables within demographic, personal behavior, expectations, and attitudinal domains improved the predictability of grade point average by 15.5% for Whites and 20.3% for Blacks; overall, these analyses accounted for 61% of the variance in grade point average for Whites and 47% for Blacks; (b) for retention, the comparable increment in predictability was 2.5% for Whites and less than 1% for Blacks; overall, the percentage of retention variance accounted for was 42% for Whites and 29% for Blacks; and (c) a paradoxical finding was the combination of a positive correlation between high school average and students' expected grades on tests and a negative correlation between expected and actual grades. The paradox is resolved by citing data that demonstrate (a) a disparity between high school grades and independently measured academic accomplishment; (b) the consequent false attributions students draw about their academic abilities; and (c) the impact of these false attributions on the priority students place on their academic responsibilities.     

Exploring issues of personality measurement and structure through the development of a short form of the Eysenck Personality Profiler

In this article, we develop a revised short form of the original Eysenck Personality Profiler (EPP; H. J. Eysenck & Wilson, 1991). In addition, we address topics of broad theoretical importance such as the recurrent empirical finding of correlations between conceptually orthogonal personality dimensions and the possibility that gender differences in these dimensions are partly spurious. In Study 1 (N = 227), we demonstrate that the existing short form of the EPP (EPP-SF; H. J. Eysenck, Wilson, & Jackson, 1996) provides a poor fit to the data and we develop a revised well-fitting version. In Study 2, we retest this version on an independent new sample (N = 3,374) where it is again found to fit the data well. We show that most of the structural and measurement parameters of the revised EPP-SF are invariant across genders. Structured means analysis indicated a significant gender difference in Psychoticism, with men scoring higher than women, but no differences in Extraversion or Neuroticism. Our discussion focuses on issues concerning personality measurement and structure, including an examination of the role of confirmatory factor analysis in personality research.     

The development of geographic categories and biases

Children and university students (N=58) estimated the locations of major cities in North America. At age 9, a distinct home region was apparent, but no differentiation between northern US and Canadian cities. At 11, four developments were observed: Children divided North America into regions that were not based solely on national boundaries but were the same as university students' regions; psychological border zones between regions exaggerated distances between them; children used new location information to update their estimates for all cities in a seeded region and in adjacent and nonadjacent regions; children preserved the ordinal structure of their initial location estimates for cities in their home region but relied on regional prototype locations to adjust estimates in less familiar regions. The updating methods reflect fundamentally different mechanisms. Theoretical and educational implications are discussed.     

Cognitive marital therapy

This article reviews recent applications of cognitive therapy to the treatment of marital distress. Three categories of cognitive phenomena that can decrease marital satisfaction and elicit dysfunctional interactions between spouses are described. First, automatic thoughts that comprise an individual's stream-of-consciousness thinking about marital events can be biased by systematic cognitive distortions. Inaccurate attributions about the causes of marital problems are a major form of such automatic thoughts. Second, individuals' behaviors toward their partners are influenced by their expectancies about the probabilities of the partner's subsequent responses, and these expectancies also are susceptible to systematic distortion. Third, an individual's unrealistic or irrational beliefs about the nature of intimate relationships can produce distress and dysfunctional behavioral responses toward the partner. Methods for assessing and modifying these dysfunctional cognitions, particularly in conjoint treatment, are described. Similarities and differences between cognitive therapy and rational-emotive therapy in the treatment of marital problems are noted.     

The assessment of personality characteristics in depressed and dependent psychiatric inpatients

The diagnosis and treatment of depression may be complicated by the presence of excessive dependency needs. Previous research has found stable personality traits useful in identifying depressive subtypes. This study was designed to assess the personality characteristics of 106 psychiatric inpatients. Subjects were grouped according to the presence or absence of two primary dimensions: depression and dependency. Results indicated that both depression and dependency were significantly related to various indices of psychopathology. Main effects were more useful than interactions, implying that depression and dependency both affect symptomology directly rather than interactively. Although the assessment of personality traits may be complicated by the presence of a major psychiatric disorder, results from our study suggest that the assessment of both Axis I and Axis II variables can be useful in understanding the current clinical picture.