Rather little is known about the mechanisms that combine the outputs of orientation-and
spatial frequency-selective channels. These can be studied by measuring the selective …

When two moving sinusoidal gratings, with similar spatial frequency, contrast, phase, but
different orientation are combined to form a plaid, their perceived direction of motion has …

Plaids are ambiguous stimuli that can be perceived either as a coherent pattern moving
rigidly or as two gratings sliding over each other. Here we report a new factor that affects the …

Although the neural location of the plaid motion coherence process is not precisely known,
the middle temporal (MT) cortical area has been proposed as a likely candidate. This claim …

Above threshold, two superimposed sinusoidal gratings of the same spatial frequency (eg 1
cycle deg− 1), of equal moderate contrast (eg C 1= C 2= 6%), and with orientations of±45° …

The perceived structure of a suprathreshold plaid made from two sinusoidal gratings
tilted±45 deg from vertical usually resembles a blurred checkerboard. Physically increasing …

Previous studies have shown that adapting to a complex grating may produce little rise in
the contrast threshold of a test grating whose spatial frequency matches one of the higher …

The misperceived direction of type-II plaids has posed a problem for the intersection of
constraints (IOC) model of two-dimensional motion perception. Alais et al.(1994)(Vision …

Interactions between size and orientation-specific mechanisms in the human visual system
were investigated using a sequential adaptation technique. Subjects adapted to a vertical …

Recent data have shown that spatial-frequency adaptation has little effect on spatial-
frequency discrimination at the adapting frequency, but there is a substantial elevation of …