Haptic perception of partial-rod lengths with the rod held stationary or wielded

Three experiments on the haptic perception of partial-rod lengths are reported. The rods were gripped between the two ends and held horizontal. The subjects held the rods stationary; the distribution of mass of the segment in front of the hand was fixed, while the distribution of mass of the segment behind the hand was varied. Perceived forward length was found to be significantly affected by the distribution of mass of the backward segment. Similar results were obtained when the rods were wielded. The results indicated that partial-rod lengths are specified by functions of mechanical perturbations acting on the hand, and not ay the breaking up of the first moment of mass or the moment of inertia of the rod by attention as suggested previously by others. The results are also discussed with respect to invariant detection and attention.     

Developing Measures of Basic Job-Relevant English Proficiency for the Prediction of Job Performance and Promotability

The present study is an attempt to devise reliable and valid measures of job-relevant basic English proficiency to be applied in the prediction of job performance and promotability in an entry-level manual labor job dominated by workers whose native language is not English. An audio test and a reading test were developed to assess the ability to understand spoken English and written English respectively using job relevant material. Results showed that both tests demonstrated high predictive validity for the criteria of supervisory assessments of incumbents' English proficiency on the job, overall job performance, and promotability. In predicting ratings of overall job performance and promotability, each test provided incremental validity over the predictability provided by the other test. In addition, the tests also provided incremental validity in predicting promotability over the predictability provided by overall job performance.     

The development of an Assertiveness Self-Report Inventory

The development of a self-report measure of assertiveness is described. The Assertiveness Self-Report Inventory (ASRI) was devised with concern for endorsement frequency, internal consistency, and independence from social desirability response bias. The scale's reliability and convergent and discriminant validity are adequate. Further tests of validity support the use of the scale as a measure that taps behavior related to the construct of assertiveness.     

An exploratory study of the relationship between face recognition memory and the volume of medial temporal lobe structures in healthy young males

A rigorous new methodology was applied to the study of structure function relationships in the living human brain. Face recognition memory (FRM) and other cognitive measures were made in 29 healthy young male subjects (mean age = 21.7 years) and related to volumetric measurements of their cerebral hemispheres and of structures in their medial temporal lobes, obtained using the Cavalieri method in combination with high resolution Magnetic Resonance Imaging (MRI. Greatest proportional variability in volumes was found for the lateral ventricles (57%) for the cerebral hemispheres (8%) in the mean volumes of the hippocampus, parahippocampal gyrus, amygdala, caudate nucleus, temporal pole and temporal lobe on the right and left sides of the brain. The volumes of the right and left parahippocampal gyrus, temporal pole, temporal lobe, and left hippocampus were, prior to application of the Bonferroni correction to take account of 12 multiple comparisons, significantly correlated with the volume of the corresponding hemisphere(p < 0.05). The volumes of all structures were highly correlated (p < 0.0002 for all comparisons) between the two cerebral hemispheres. There were no positive relationships between structure volumes and FRM score. However, the volume of the right amygdala was, prior to application of the Bonferroni correction to take account of 38~multiple comparisons, found to be significantly smaller in the five most consistent high scorers compared to the five most consistent low scorers (t = 2.77,p = 0.025). The implications for possible relationships between healthy medial temporal lobe structures and memory are discussed.     

Repression, Dissociation, and the Recovered Memory Debate: Constructing Scientific Evidence and Expertise

We examine arguments about the scientific status of repression and dissociation in the written discourse of academic social scientists and clinicians on the controversial issue of recovered memories of child sexual abuse. The rhetorical deployment of theories, methods, and evidence by representatives of both camps regarding the authenticity of recovered memories, repression, and dissociation is compared. The ways in which supporters and sceptics bolster claims for their own expertise while undermining that of opponents are also explored. Supporters of recovered memory emphasise the pragmatic relevance of theories and clinical evidence, while sceptics draw rhetorically on positivist standards of scientific rigour and reliability to undermine claims of recovered memory. The themes of relevance and reliability are then related to discussions of recent legal changes in the United States on the admissibility of expert opinion evidence in recovered memory cases.     

Enhanced Hippocampal CA1 LTP but Normal Spatial Learning in Inositol 1,4,5-trisphosphate 3-kinase(A)-Deficient Mice

To define the physiological role of IP₃3-kinase(A) in vivo, we have generated a mouse strain with a null mutation of the IP₃3-kinase(A) locus by gene targeting. Homozygous mutant mice were fully viable, fertile, apparently normal, and did not show any morphological anomaly in brain sections. In the mutant brain, the IP₄ level was significantly decreased whereas the IP₃ level did not change, demonstrating a major role of IP₃3-kinase(A) in the generation of IP₄. Nevertheless, no significant difference was detected in the hippocampal neuronal cells of the wild-type and the mutant mice in the kinetics of Ca²⁺ regulation after glutamate stimulation. Electrophysiological analyses carried out in hippocampal slices showed that the mutation significantly enhanced the LTP in the hippocampal CA1 region, but had no effect on the LTP in dentate gyrus (DG). No difference was noted, however, between the mutant and the wild-type mice in the Morris water maze task. Our results indicate that IP₃3-kinase(A) may play an important role in the regulation of LTP in hippocampal CA1 region through the generation of IP₄, but the enhanced LTP in the hippocampal CA1 does not affect spatial learning and memory.     

The situational effects on haptic perception of rod length

Three experiments were conducted to investigate situational effects (manipulation, range, and prior experience) on the haptic perception of rod length. Each rod was held between its two ends with one hand. In Experiment 1, 32 participants judged length of rods using different manipulations. Perceived lengths were found to be dependent on manner of manipulation and not necessarily equal to actual lengths. Different parameters were detected in different manipulations. In Experiment 2, 8 participants judged rod lengths by wielding rods of two ranges: long and short. Perceived length was found to be affected by the range of rods evaluated successively in a single set. In Experiment 3, 9 participants judged rod lengths after an experience of handling dense or light rods. Perceived length was found to be affected by prior experience. Results are discussed in terms of how rod lengths can be perceived accurately by haptic modality without involving direct perception.     

The assessment of motor control in sighting dominance using an illusion decrement procedure

Walls (1951) proposed that perceptual asymmetries between the sighting dominant and the nonsighting dominant eyes were based upon differences in the monitoring of eye movements. The present research explored this hypothesis in the context of an illusion decrement paradigm. Since illusion decrement seems to occur only under conditions of free eye-movement inspection, it was reasoned that any motoric asymmetries would manifest themselves through differences in the rate and extent of decrement. These predictions were partially confirmed. The sighting eye manifested greater illusion decrement, but the effect remained specific to conditions where both eyes were stimulated. In addition, asymmetries in the interocular transfer of illusion decrement were found to favor the sighting dominant eye.     

A comparative study of personality in adults and children: Hong Kong vs England

The 90-item adult version of the Eysenck Personality Questionnaire was translated into Chinese and administered to 270 male and 462 female subjects in Hong Kong. In a second study the 81-item version of the Junior EPQ (JEPQ) was translated into Chinese and given to 698 boys and 629 girls.Reasonably valid scales for use in Hong Kong are suggested for both adult and junior forms of the questionnaire. In a direct comparison of British and Chinese (Hong Kong) groups, using reduced scales comprising only items both scoring keys had in common. Hong Kong adults scored higher on Psychoticism and Social Desirability and lower on Extraversion than the British while children from Hong Kong scored lower on Extraversion and Neuroticism but higher on Social Desirability than their British counterparts. Indices of factor comparison were universally high, indicating that the major dimensions of personality were very similar in Hong Kong Chinese as in British subjects.