Abstract
An overview will be given of the many experimental and theoretical studies of saddle-point phenomena, with special emphasis on adiabatic collisions and simple systems. For such cases, experimental evidence for the actual existence of saddle-point electrons has been obtained by different groups using different techniques. At intermediate-energy collisions, the observation of saddle-point effects is still a controversial issue. It will be argued that even though for these relatively fast collisions the underlying saddle-point mechanism may still be present, no pronounced saddle-point features should be expected.
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