Peter A. van der Helm

Integrating Global and Local Aspects of Visual Occlusion

Rob van Lier, Peter A. van der Helm, Emanuel Leeuwenberg · Perception · 1994 · 119 citations

Medicine, Vision Science, Spatial Vision +13

Accessibility: A criterion for regularity and hierarchy in visual pattern codes

Peter A. van der Helm, E. L. J. Leeuwenberg · Journal of Mathematical Psychology · 1991 · 96 citations

Medicine, Vision Science, Visual Neuroscience +7

Competing global and local completions in visual occlusion.

R.J. van Lier, Peter A. van der Helm, E. L. J. Leeuwenberg · Journal of Experimental Psychology Human Perception & Performance · 1995 · 89 citations · Full text

Medicine, Vision Science, Drawing +8

Overexpression of a tryptophan decarboxylase cDNA inCatharanthus roseus crown gall calluses results in increased tryptamine levels but not in increased terpenoid indole alkaloid production

Oscar J. M. Goddijn, E. J. M. Pennings, Peter A. van der Helm et al. · Transgenic Research · 1995 · 86 citations

Life Sciences, Plant Biology, Plant Sciences +9

Symmetry and selective attention: A dissociation between effortless perception and serial search

Christian N. L. Olivers, Peter A. van der Helm · Perception & Psychophysics · 1998 · 70 citations · Full text

Medicine, Behavioral Sciences, Psychology +16