The experiments reported in this paper were carried out to determine the effect moving background patterns have on the response characteristics of directionally specific neurons in the pigeon optic tectum. First, care was taken to select the optimal single stimulus for each cell, then large textured patterns were added to the test stimulus and moved either "in-phase" or "anti-phase". Altogether 214 cells were studied in 77 white Carneaux pigeons and it was found that all cells below a depth of 400 microns were inhibited by backgrounds moved "in-phase" with the optimal test stimulus, while few cells above this level were affected in any way by backgrounds. All directions of background motion containing an "in-phase" vector resulted in rather profound inhibition of the directional response while directions with an "anti-phase" vector produced less inhibition and sometimes were even facilitated by direct "anti-phase". The velocity tuning curves obtained with an optimal single test stimulus and by "anti-phase" movement of backgrounds were essentially similar. "In-phase" inhibition can also be produced by a second spot stimulus located some distance from the test stimulus. This latter effect was used to map the outer margins of the inhibitory receptive fields of deep tectal neurons displaying these effects and it was found they were extremely large, often in excess of 100 degrees in diameter. When masks were used to prevent the moving background from stimulating the excitatory receptive field "anti-phase" movement always produced facilitation. This suggests a double opponent-process directionally specific receptive field organization. These neurons seem well suited to respond to local (object) motion and to ignore translation of the visual image arising from body, head and eye movements.

Two experiments were carried out to test the hypothesis that the long onset latency of steady-state subjective rotation induced by rotating a tall striped drum around a stationary observer is the result of visual-vestibular conflict. A reduction of this conflict should, therefore, reduce the length of the latency period. In Experiment 1, visual-vestibular conflict was reduced by providing the observers with corroborating vestibular stimulation at the start of optokinetic stimulation. Onset latencies were found to be significantly shortened with corroborating vestibular stimulation, but to be unaffected by noncorroborating vestibular stimulation. In Experiment 2, testing was done on a group of patients with unilateral (right labyrinth) Meniere's disease, which produces decreased vestibular sensitivity to rightward body rotation and increased vestibular sensitivity to leftward body rotation. Visual-vestibular conflict during subjective rotation to the right should therefore be decreased, while during leftward subjective rotation it should be increased. The prediction that the latency to steadystate subjective rotation should be shorter than normal with subjective rotation to the left was supported.

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Competencies have been used as valid predictors of superior on-the-job performance in business organizations over the last 40 years. An abundant of empirical evidence has suggested that competencies play important roles in human resource management (HRM) practices for different types of organizations. However, the important roles of competency have not been fully integrated into the business world, creating a gap between theory and practice. There seems to also appear a number of misperceptions with regards to the use of the term 'competency' in the literature. This paper intends to trace the origins of competency and document various definitions and concepts of competency proposed by different scholars. In addition, the paper also aims to shed light on the processes, guidelines, and techniques for developing competencies pragmatically for a particular job or profession as well as the importance of competency-based assessment in organizations for today's HRM practices.

Traditionally, graphic design (GD) education focuses on the training of technical production skills to prepare graduates for entry-level employment. However, due to the new challenges and the expanding opportunities of emerging practices, GD graduates are expected to master a wide range of additional competencies beyond traditional scope. The study aims to identify the competencies required by future GD graduates in the context of Malaysia. A two-round modified Delphi technique was used to gain consensus from a panel of experts consisted of design educators and industry practitioners regarding the competencies needed by the graduates for effective work performance. A total of 108 competencies were generated. All accepted competencies were ranked ‘very important’ and ‘extremely important’ by at least 75 percent of the respondents in Round Two. These competencies could be classified into 29 subdomains under five components, i.e., cognitive competence, functional competence, personal competence, ethical competence, and meta-competencies. The findings of this study are useful for enhancing the education and employability of graphic designers as they provide a common vocabulary to relevant stakeholders about the standards of performance for new entrants to the GD profession.