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Marken, Richard S.	1

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Optical Trajectories and the Informational Basis of Fly Ball Catching

Peer reviewed

Direct link

Marken, Richard S. – Journal of Experimental Psychology: Human Perception and Performance, 2005

D. M. Shaffer and M. K. McBeath (see record 2002-02027-006) plotted the optical trajectories of uncatchable fly balls and concluded that linear optical trajectory is the informational basis of the actions taken to catch these balls. P. McLeod, N. Reed, and Z. Dienes (see record 2002-11140-016) replotted these trajectories in terms of changes in…

Descriptors: Visual Perception, Optics, Geometric Concepts, Motion

Six Hard Pieces.

Peer reviewed

Jamski, William D. – Arithmetic Teacher, 1989

Describes an activity to create squares by placing different numbers of tangram pieces together. Discusses why the combination of six tangram pieces can not create a square. Presents diagrams of the tangram pieces and the squares made. (YP)

Descriptors: Elementary Education, Elementary School Mathematics, Geometric Concepts, Geometric Constructions