A new breed of computer users: Rats control a cursor via joystick manipulation

Many exciting findings have been reported in the 15 years since monkeys were first demonstrated to have the capacity to perform computerized tasks. The present data indicate that albino rats can also learn to respond to computer-generated stimuli by manipulating a joystick. Although the rat’s control of the cursor is not as skillful as has been reported for primate species, it is clearly better than chance and suggests the great potential for comparative investigation afforded by use of the computer test system.     

Judgments of Monkey’s (Macaca mulatta) Facial Expressions by Humans: Does Housing Condition “Affect” Countenance?

The Psychological Record - The ability to interpret facial expressions of others is one of the more important abilities possessed by humans. However, is it possible for humans to interpret the...     

Delinquent Behavior Across Adolescence: Investigating the Shifting Salience of Key Criminological Predictors

This study examines the impact of changes in the influence of several individual-level constructs (e.g., risk-seeking, family, peers, attitudes) on involvement in substance use and delinquent behavior during mid to late adolescence. Data were drawn from the longitudinal evaluation of the Gang Resistance, Education, and Training (G.R.E.A.T.) program. The final pooled time series samples used in the analyses were n = 2,515 in the delinquency model (original sample: n = 847) and n = 2,250 in the substance use model (original sample: n = 849). Fixed effects negative binomial modeling indicated that: (1) changes in risk-seeking, parental and peer influences, and attitudes are significantly related to the frequency of self-reported delinquency and substance use and (2) similar risk factors, drawn from multiple domains, influence the likelihood of greater involvement in both delinquency and substance use during mid to late adolescence. Findings highlight the importance of considering a variety of dynamic processes during adolescence and their potential changing influence on deviant behaviors.     

Game-like tasks for comparative research: Leveling the playing field

Game-like computer tasks offer many benefits for psychological research. In this paper, the usefulness of such tasks to bridge population differences (e.g., age, intelligence, species) is discussed and illustrated. A task called ALVIN was used to assess humans’ and monkeys’ working memory for sequences of colors with or without tones. Humans repeated longer lists than did the monkeys, and only humans benefited when the visual stimuli were accompanied by auditory cues. However, the monkeys did recall sequences at levels comparable to those reported elsewhere for children. Comparison of similarities and differences between the species is possible because the two groups were tested with exactly the same game-like paradigm.     

The Heuristic and Motivational Value of Video Reinforcement

Four rhesus monkeys (Macaca mulatta) were tested on joystick-based computer tasks in which they could choose to be reinforced either with pellets-only or with pellets + video. A variety of videotapes were used to reinforce task performance. The monkeys significantly preferred to be rewarded with a pellet and 10 s of a blank screen than a pellet plus 10 s of videotape. When they did choose to see videotaped images, however, they were significantly more likely to view video of themselves than video of their roommate or of unfamiliar conspecifics. These data support earlier findings of individual differences in preference for video reinforcement, and have clear implications for the study of face-recognition and self-recognition by nonhuman primates.     

Romantic Physical Affection Types and Relationship Satisfaction

College students (N = 295, 100 men, 195 women) responded to a questionnaire examining their preferences and attitudes regarding romantic physical affection (PA) types and relationship satisfaction (sexual intimacy is excluded from the scope of this study). The seven PA types examined are backrubs/massages, caressing/stroking, cuddling/holding, holding hands, hugging, kissing on the lips, and kissing on the face (not lips). In general, PA is found to be highly correlated with relationship and partner satisfaction as is suggested by prior research. Respondents' attitudes regarding the seven PA types are given in ordinal data (with gender differentiation) across the dimensions favorite, frequent, intimate, and expressive of love. Those respondents currently involved in romantic relationships provided information as to the average amounts of each PA type they engage in per week. These amounts were significantly correlated with relationship and partner satisfaction for all PA types except holding hands and caressing/stroking. Conflict resolution was generally found to be easier with more PA, but the amount of conflict was irrespective of PA. Conflict was resolved easier with increasing amounts of cuddling/holding (p < .01), kissing on the lips (p < .01), and hugging (p < .05). The implications of these findings are discussed.

     

A new breed of computer users: rats control a cursor via joystick manipulation.

Many exciting findings have been reported in the 15 years since monkeys were first demonstrated to have the capacity to perform computerized tasks. The present data indicate that albino rats can also learn to respond to computer-generated stimuli by manipulating a joystick. Although the rat's control of the cursor is not as skillful as has been reported for primate species, it is clearly better than chance and suggests the great potential for comparative investigation afforded by use of the computer test system.     

A temporary threshold shift for self-motion detection following sustained,oscillating linear acceleration

Thresholds for detecting linear motion (self-motion) increased following exposure of human observers to sustained linear oscillation (fatiguing stimulus) at 0.26 Hz and approximately 0.5 G peak-to-peak for durations up to 30 min. Recovery to preexposure levels took place over a period of 10 to 15 rain following the sustained oscillation termination. Differences in threshold shift magnitudes following sustained oscillation in various orientations support the interpretation that the observed threshold shifts resulted from fatigue of the utricular otolith receptors. Threshold shifts were not obtained following exposure of the human observers to sustained, unidirectional linear acceleration (2 G) for durations up to 10 rain with a centrifuge. The results of this study suggest a previously unobserved response property of the otolith organs, namely, that these organs can be fatigued in a manner analogous to other receptor systems.