Â Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚  MARQUETTE – Diana Hudson, an experimental psychology graduate student at Northern Michigan University, will present the next psychology colloquium from 3:10-4:15 p.m. Friday, Dec. 3, in Gries Hall room 167 at NMU.

 Â Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚  The colloquium is titled "The Müller-Lyer Illusion and Transfer of Decrement." The Müller-Lyer Illusion is an optical illusion involving two lines which appear to be of different lengths due to the placement of arrowheads, but are actually the same length. With practice, Müller-Lyer illusion effects decrease.  This decrement transfers to small variations in the illusion, but not to more global changes such as rotating the lines 180 degrees.

 Â Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚  Hudson studied the transfer of decrement in both the double-arrowed and single-arrowed lines to evaluate whether the different parts (arrowheads pointing inward or outward) of the Müller-Lyer are functionally different illusions. Results suggest that training transfers within the same arrowhead directions, regardless of which number of arrowheads subjects were trained on.  However, transfer was significantly less when the number of arrowheads changed or when both number and direction changed.

 Â Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚ Ã‚  The public is invited to attend this free event. The event is part of the 2004-2005 Psychology Colloquia Series, sponsored by the NMU department of psychology.

Prepared By
Jessica Holman