Elicitation and Inhibition of Competitive Fighting in Food Deprived Mice

Habituation as an index of the intrasensory and intersensory integration of form was investigated in nine-year-old children. In Habituation Period One, Ss were habituated to either a visual or a haptic 14″-perimeter standard stimulus. During Habituation Period Two, groups were subdivided and presented with one of the following stimuli: (a) 14″ visual, (b) 16″ visual, (c) 14″ haptic, or (d) 16″ haptic. The dependent variables were GSR frequency and amplitude, visual fixation time, and touching time. Subjects required more trials to habituate to the different stimulus presented in Habituation Period Two than Ss who received repeated presentations of the same stimulus. GSR frequency and amplitude habituated more consistently than did fixation and touching response measures. The results supported the use of the habituation paradigm for the study of intersensory and intrasensory integration, as well as providing support for extending Sokolov's theory to intersensory functions.     

The Role of Short-Term Memory in Semantic Priming

Two theories of priming were compared: spreading activation theories, in particular ACT* (J. R. Anderson, 1983), and compound-cue theories (R. Ratcliff & G. McKoon, 1988). Whereas ACT* assumes that priming is a result of diffusing activation in long-term memory, compound-cue models suggest that priming results from a formation process of prime and target in short-term memory. Thirty-eight participants took part in a study that combined a digit span task with a double lexical decision task consisting of a prime and a target item. Digit span length (low, medium, and high) and prime type (related or unrelated word or nonword) were both within-subject variables. As expected, results showed significant priming effects. In favor of ACT*, no interaction between digit span length and prime type was found. Additionally, a nonword inhibition effect (unrelated versus nonword prime) was found, which was predicted by compound-cue theories. This finding is discussed in terms of the process interference and response competition hypotheses.     

Validity of the Personality Assessment Inventory Aggression Scales and Violence Potential Index in Veterans With PTSD

Examined humor appreciation of cartoons as a function of sex of subject and type of humor. Four broad types of humor were presented: sexual-exploitative, sexual-nonexploitative, nonsexual-hostile, and nonsexual-nonhostile. Sexual-nonexploitative humor was rated as funnier than the other three types but nonsexual-nonhostile humor was given a more positive overall rating than the other types. Relative to males, females gave greater ratings of hostility to the cartoons and rated them less positively. Correlational analyses further suggested that females were not as affected as males by variations in sexuality, exploitation, and hostility. For males, greater ratings of sexuality were associated with greater funniness ratings while the reverse was true for greater ratings of hostility. Possible interpretations of these data were discussed.     

The perception of emotions by ear and by eye

Emotions are expressed in the voice as well as on the face. As a first step to explore the question of their integration, we used a bimodal perception situation modelled after the McGurk paradigm, in which varying degrees of discordance can be created between the affects expressed in a face and in a tone of voice. Experiment 1 showed that subjects can effectively combine information from the two sources, in that identification of the emotion in the face is biased in the direction of the simultaneously presented tone of voice. Experiment 2 showed that this effect occurs also under instructions to base the judgement exclusively on the face. Experiment 3 showed the reverse effect, a bias from the emotion in the face on judgement of the emotion in the voice. These results strongly suggest the existence of mandatory bidirectional links between affect detection structures in vision and audition.     

Cognitive-neuropsychological function in chronic physical aggression and hyperactivity

Histories of violence and of hyperactivity are both characterized by poor cognitive-neuropsychological function. However, researchers do not know whether these histories combine in additive or interactive ways. The authors tested 303 male young adults from a community sample whose trajectories of teacher-rated physical aggression and motoric hyperactivity from kindergarten to age 15 were well defined. No significant interaction was found. In a 1st model, both histories of problem behavior were independently associated with cognitive-neuropsychological function in most domains. In a 2nd model controlling for IQ, general memory, and test motivation, the 3 working-memory tests (relevant to executive function) remained associated with physical aggression, and 1 remained associated with hyperactivity. These results support an additive model.     

Can practice overcome age-related differences in the psychological refractory period effect?

Can dual-task practice remove age-related differences in the psychological refractory period (PRP) effect? To answer this question, younger and older individuals practiced 7 blocks of a PRP design, in which Task 1 (T1) required a vocal response to an auditory stimulus and Task 2 (T2) required a manual response to a visual stimulus (Experiment 1). The results showed that practice did not reduce, but rather increased, age-related differences in PRP interference. Using the trained individuals, the introduction of a less complex new T1 (Experiment 2) or a less complex new T2 (Experiment 3) with the task previously practiced reduced the PRP interference but only in older adults. The authors propose that older adults suffer from a large task-switch cost that is more sensitive to task complexity than to the amount of practice.     

Limiting the use of verbal coding in the Visual Patterns Test

The aims of the study were to assess the availability of verbal coding and its effect on performance in a standard visual matrix task, the Visual Patterns Test (VPT). In a pilot study, participants were presented with the patterns from the VPT and were asked to name the shapes within them. Availability of verbal codes was low overall; however, some patterns resulted in a higher mean number of labels than others. A modified version of the test was created from those patterns that had produced the lowest mean number of labels. A total of 60 participants then took part in an experimental study, which was carried out to assess whether or not the availability of verbal coding affects task performance. It was found that the modified version resulted in a lower visual working-memory span than that of another version in which the availability of verbal coding was higher. The study confirmed that verbal coding does influence visual matrix task performance; however, the modified version now offers a selection of patterns from the VPT where verbal coding has been limited.