ANNOUNCING THE LATEST RELEASE OF OUR PSYCHOPHYSICS
SOFTWARE PACKAGE
MORPHONOME is a plug-and-play software package for detection
psychophysics on the Macintosh. It provides most standard
psychophysics routines and a huge variety of stimulus options.
The latest version, 3.3, includes moving grating stimuli in
hard-edged windows and graded envelopes (including drifting
Gabor patches), and a variety of color and equiluminance options.
It also includes staircase psychophysics, customization of
experimental parameters and saving of results with the complete
experimental conditions.
(Morphonome 3.3 is for Power Macintosh only)
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Features of the Morphonome Image Psychophysics Software.
The Morphonome 3.3 software package for image psychophysics
allows generation and presentation of a wide spectrum of 2-D moving
and colored images for psychophysical testing of the limits of human
perception. It runs on the Power Macintosh family of computers
without hardware modifications.
The full-screeen test images are generated under parametric control
to permit a wide variety of published and novel experiments in the
detection, masking, discrimination and perception of static and
moving luminance and chromatic contrast variations.
Repetitive spatial patterns are based on sinusoidal, square and ramp
luminance profiles in linear, radial, spoke, spiral, 2D checkerboard
and hexagonal configurations. 2D Gaussian and 2D difference of
Gaussian profiles are also available. Spatial frequency, orientation,
and contrast are freely selectable. Stimulus modulations of one- and
two-dimensional pixel noise, in the form of either static (changing
from trial-to-trial) or modulatable dynamic noise are included for
use as masking or as a test stimuli.
Patterns may be windowed with square, circular, disk/annulus,
Gaussian fade, derivative of Gaussian, and Gaussian ring envelopes.
The Gaussian-based envelopes have variable ellipticity and
orientation. Multiple patch combinations of these patterns are also
possible. Center/surround and split-field configurations between any
of the pattern varieties are available.
The luminance scale is fully linearizable to 99.9% output contrast
(with monitor calibration. We also supply a separate automated
calibrator system). A parametrically variable sample of "gamma"
functions is provided to allow perceptual equalization of the
luminance scale for specific applications that require such
departures from physical linearity.
Output luminance and chromatic contrast can be varied in increments
of as little as 0.1%. An invariant base contrast can be set to any level.
Patterns may be balanced or unidirectionally biased from the mean
luminance. Contrast and its modulation are controlled by a look-up
table animation, which may be split into two or four separate functions
(with a corresponding loss in the number of available luminance
levels for each independent image).
Conflict-of-Interest Statement. This product is distributed at
cost on a non-profit basis through the Smith-Kettlewell Eye Research
Institute for the benefit of the vision community.
Further details available through the following contacts:
Christopher W. Tyler, Ph.D.
Associate Director
Smith-Kettlewell Eye Research Institute
2232 Webster Street, San Francisco, CA 94115 USA
Ph. 415-561-1640 Fax 415-561-1610
Email: cwt@skivs.ski.org Home Page: http://www.ski.org/cwt.html