scholarly journals The effects of visual attention and object affordance on the on-line control of arm movements

2004 ◽  
Vol 4 (8) ◽  
pp. 445-445 ◽  
Author(s):  
F. A. Maratos ◽  
S. J. Anderson
Keyword(s):  
Visual Attention ◽  
Arm Movements ◽  
On Line ◽  
Object Affordance

Developmental Differences in Children's Ballistic Aiming Movements of the Arm

2003 ◽  
Vol 96 (2) ◽  
pp. 589-598 ◽  
Author(s):  
Jin H. Yan ◽  
George E. Stelmach ◽  
Katherine T. Thomas ◽  
Jerry R. Thomas
Keyword(s):  
Age Groups ◽  
Arm Movements ◽  
Arm Movement ◽  
Developmental Differences ◽  
Time To Peak ◽  
Timing Variability ◽  
Movement Performance ◽  
Dependent Variables ◽  
Movement Sequence ◽  
On Line

An experiment was conducted to examine the change in the relation between programming and “on-line” correction as a developmental explanation of children's arm movement performance. Each of 54 children in three age groups (5. 8, and 10 yr.) completed two types of rapid aiming arm movements in the longitudinal plane on the surface of a digitizer. Percent primary submovements and timing variability were dependent variables. Analysis suggested that the 5-yr.-olds used “on-line” monitoring during the arm movement and did not perform the movement sequence as a functional unit. Compared with 8- and 10-yr.-olds, the 5-yr.-olds planned a smaller portion of movements, executed the arm movements with more variability in time to peak velocity. The 8- and 10-yr.-olds appeared to plan their movements and execute the sequence as a unit. The developmental implications were discussed.

On-line versus off-line vestibular-evoked control of goal-directed arm movements

Neuroreport ◽  
2002 ◽  
Vol 13 (12) ◽  
pp. 1563-1566 ◽  
Author(s):  
Jean-Pierre Bresciani ◽  
Jean Blouin ◽  
Fabrice Sarlegna ◽  
Christophe Bourdin ◽  
Jean-Louis Vercher ◽  
...  
Keyword(s):  
Arm Movements ◽  
On Line

scholarly journals Modulation of visual attention by object affordance

2014 ◽  
Vol 5 ◽  
Author(s):  
Patricia Garrido-Vásquez ◽  
Anna Schubö
Keyword(s):  
Visual Attention ◽  
Object Affordance

scholarly journals Pupil Frequency Tagging: an on-line measure of visual attention

2013 ◽  
Vol 13 (9) ◽  
pp. 291-291
Author(s):  
M. Naber ◽  
G. Alvarez ◽  
K. Nakayama
Keyword(s):  
Visual Attention ◽  
On Line ◽  
Line Measure

The on-line use of histogram data for high-speed correction and alignment of electron microscope images

1984 ◽  
Vol 42 ◽  
pp. 556-557
Author(s):  
William Krakow
Keyword(s):  
Power Spectrum ◽  
High Speed ◽  
Direct Memory Access ◽  
Digital Television ◽  
Contrast Transfer Function ◽  
The Past ◽  
High Resolution Tem ◽  
On Line ◽  
Correction Of Astigmatism ◽  
The Fourier Transform

In the past few years on-line digital television frame store devices coupled to computers have been employed to attempt to measure the microscope parameters of defocus and astigmatism. The ultimate goal of such tasks is to fully adjust the operating parameters of the microscope and obtain an optimum image for viewing in terms of its information content. The initial approach to this problem, for high resolution TEM imaging, was to obtain the power spectrum from the Fourier transform of an image, find the contrast transfer function oscillation maxima, and subsequently correct the image. This technique requires a fast computer, a direct memory access device and even an array processor to accomplish these tasks on limited size arrays in a few seconds per image. It is not clear that the power spectrum could be used for more than defocus correction since the correction of astigmatism is a formidable problem of pattern recognition.

Image registration with a computer driven S.T.E.M.

1978 ◽  
Vol 36 (1) ◽  
pp. 98-99
Author(s):  
A.M.H. Schepman ◽  
J.A.P. van der Voort ◽  
J.E. Mellema
Keyword(s):  
Spot Size ◽  
Scanning Transmission Electron Microscope ◽  
Small Computer ◽  
Structural Studies ◽  
Area Of Interest ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
Specimen Area ◽  
On Line ◽  
Minimum Distances

A Scanning Transmission Electron Microscope (STEM) was coupled to a small computer. The system (see Fig. 1) has been built using a Philips EM400, equipped with a scanning attachment and a DEC PDP11/34 computer with 34K memory. The gun (Fig. 2) consists of a continuously renewed tip of radius 0.2 to 0.4 μm of a tungsten wire heated just below its melting point by a focussed laser beam (1). On-line operation procedures were developped aiming at the reduction of the amount of radiation of the specimen area of interest, while selecting the various imaging parameters and upon registration of the information content. Whereas the theoretical limiting spot size is 0.75 nm (2), routine resolution checks showed minimum distances in the order 1.2 to 1.5 nm between corresponding intensity maxima in successive scans. This value is sufficient for structural studies of regular biological material to test the performance of STEM over high resolution CTEM.

Design and calibration of an IVEM for general 3-dimensional imaging of non-diffracting materials

1992 ◽  
Vol 50 (2) ◽  
pp. 1040-1041
Author(s):  
Neil Rowlands ◽  
Jeff Price ◽  
Michael Kersker ◽  
Seichi Suzuki ◽  
Steve Young ◽  
...  
Keyword(s):  
3D Imaging ◽  
Tomographic Reconstruction ◽  
Three Dimensional ◽  
3 Dimensional ◽  
3D Microstructure ◽  
Image Translation ◽  
Digital Correlation ◽  
On Line ◽  
Mechanical Stage ◽  
Projection Angle

Three-dimensional (3D) microstructure visualization on the electron microscope requires that the sample be tilted to different positions to collect a series of projections. This tilting should be performed rapidly for on-line stereo viewing and precisely for off-line tomographic reconstruction. Usually a projection series is collected using mechanical stage tilt alone. The stereo pairs must be viewed off-line and the 60 to 120 tomographic projections must be aligned with fiduciary markers or digital correlation methods. The delay in viewing stereo pairs and the alignment problems in tomographic reconstruction could be eliminated or improved by tilting the beam if such tilt could be accomplished without image translation.A microscope capable of beam tilt with simultaneous image shift to eliminate tilt-induced translation has been investigated for 3D imaging of thick (1 μm) biologic specimens. By tilting the beam above and through the specimen and bringing it back below the specimen, a brightfield image with a projection angle corresponding to the beam tilt angle can be recorded (Fig. 1a).

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