WorldCat Identities

Kovács Attila J.

Works: 8 works in 10 publications in 2 languages and 9 library holdings
Genres: Academic theses 
Roles: Author, Creator
Publication Timeline
Most widely held works by Kovács Attila J.
Comments on IPCC report and Hungarian renewable energy situation by Miklós Neményi( Book )

2 editions published in 2008 in English and held by 2 WorldCat member libraries worldwide

A bozsoki Zsidó-rét növényzete és botanikai értékei by Attila J Kovács( Book )

2 editions published in 1992 in Hungarian and held by 2 WorldCat member libraries worldwide

Research activities of the Institute of Biosystems Engineering (University of West Hungary) related to renewable energies( Book )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

Élelmiszeripari műveletek : gyakorlati segédlet by Kovács Attila J( Book )

1 edition published in 2013 in Hungarian and held by 1 WorldCat member library worldwide

Perceptual and attentional constraints on 1:1 bimanual coordination by Attila J Kovacs( )

1 edition published in 2011 in English and held by 1 WorldCat member library worldwide

Two experiments were conducted in an attempt to further the understanding of how previously identified intrinsic constraints and perceptual factors interact in influencing the learning and performance of various bimanual coordination patterns. The purpose of Experiment 1 was to determine the influence of Lissajous feedback on 1:1 bimanual coordination patterns (0°, 90°, 180° phase lags) when the movement amplitudes of the two limbs were different. Participants coordinated rhythmic movements of their forearms while being provided separate feedback for each limb (no- Lissajous group) or integrated feedback (Lissajous group). Data from Experiment 1 supports the notion that the lead-lag relationship as well as amplitude assimilation between limbs observed in the literature can be partially attributed to the visualperceptual factors present in the testing environment. When participants are provided integrated feedback in the form of Lissajous plots and templates much of the lead-lag and amplitude assimilation effects were eliminated and relative phase error and variability were also greatly reduced after only 3 min of practice under each condition. Results from recent experiments suggest that when the salient visual information (Lissajous feedback) is removed, performance in bimanual coordination tasks rapidly deteriorates. The purpose of Experiment 2 was to determine if reducing the frequency of feedback presentation will decrease the reliance on the feedback and will facilitate the development of an internal representation that will improve performance when visual feedback is removed. Participants receiving reduced frequency feedback presentation were able to perform a delayed retention test with the feedback removed as well as the test with feedback present. Data from Experiment 2 demonstrates that salient extrinsic Lissajous feedback can effectively be combined with reduced frequency feedback presentation in a way that performance levels, when tested without the availability of feedback, match those obtained when tested in the presence of Lissajous feedback. Taken together the present experiments add to the growing literature that supports the notion that salient perceptual information can override some aspects of the system's intrinsic dynamics typically linked to motor output control. The strong tendencies toward the intrinsic dynamics found in numerous previous bimanual movement studies and the difficulties in producing various coordination patterns may actually represent detrimental effects attributable to the perceptual information available in the environment and the attentional focus participants adopt. Given external integrated salient visual information participants can essentially tune-in and learn difficult bimanual coordination patterns with relatively little practice
Liquid biofuels( Book )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

Speed coupli[n]g in hitting a moving target by Attila J Kovacs( Book )

1 edition published in 2006 in English and held by 1 WorldCat member library worldwide

The purposes of this study were to examine how different ball speeds affect the kinematics of hand movements and the accuracy of hitting the targets. An innovative task was designed in the present experiment. Participants (n=12) were asked to hold a handle with their left hand on the smooth surface of a table and try to hit a moving table tennis ball into a 3-ring basket. A table tennis robot was used to shot the balls. The handle was required to move along a straight line perpendicular to the ball movement. A Peak Motus 2D system was used to collect and analyze the handle and ball movements. The three ball speeds were randomly and equally assigned into every practice block, each block with 9 trials at 5 s interval. The total practice consisted of 9 blocks with 2 min pause between blocks. The movement amplitude, the handle size, and the ball size were held constant. The results demonstrated a very strong positive correlation between the mean handle velocity and the ball speed (r = 0.74, p<0.01) when the balls were hit into the 3-ring basket. But the correlation was relatively weaker when the balls were missed or hit out of the basket. In addition, the accuracy of hitting the balls was assessed by the K-ANOVA. The analysis revealed a practice effect (p<0.01) and a ball speed effect (p<0.01). It suggested that more practice increased the accuracy of hitting the targets while higher ball speed decreased the accuracy
The coding and effector transfer of movement sequences( )

1 edition published in 2009 in English and held by 0 WorldCat member libraries worldwide

Audience Level
Audience Level
  Kids General Special  
Audience level: 0.89 (from 0.51 for Speed coup ... to 1.00 for The coding ...)