AES neurons show an interesting form of the principle of inverse effectiveness: Cross-sensory in regions in which the unisensory component stimuli would evoke only a moderate response produce additive (or, superadditive?) responses. In contrast, Cross-sensory stimuli at the `hot spots' of a neuron tend to produce sub-additive responses.⇒
Neurons in the deep SC which show an enhancement in response to multisensory stimuli peak earlier.
The response profiles have superadditive, additive, and subadditive phases: Even for cross-sensory stimuli whose unisensory components are strong enough to elicit only an additive enhancement of the cumulated response, the response is superadditive over parts of the time course.⇒
The temporal time course of neural integration in the SC reveals considerable non-linearity: early on, neurons seem to be super-additive before later settling into an additive or sub-additive mode of computation.⇒
Studies of single-neuron responses to multisensory stimuli have usually not explored the full dynamic range of inputs---they often have used near- or subthreshold stimulus intensities and thus usually found superadditive effects. ⇒