Figure 1. Three models for the effect of attention on coherence-response functions (Figure adapted from⁴).

The top row shows the coherence-response functions in two attentional conditions in each model and the bottom row indicates the respective attentional modulation. Black horizontal lines in the top row indicate the spontaneous activity. Attention can shift coherence-response functions (coherence gain model), causing an attentional modulation that is particularly large for intermediate coherences (bottom left panel). Alternatively, attention can multiply the neuronal responses at all levels of motion coherence with a fixed factor (response gain model) or it can change neuronal activity by a fixed gain across all motion coherences (activity gain model).