In these studies, stimuli are presented in an unbroken, sequential manner, and can be used to estimate simultaneously the mean difference in neural activity between stimuli as well as the effect of one stimulus upon another (carry-over effects).
In almost all these studies, stimuli consisted of drifting sine-wave gratings that were presented for relatively long durations −4 seconds usually.
However, in these studies, stimuli were presented for a relatively long duration (e. g., 4 seconds), making it possible that contrast adaptation contributed to contrast-invariance of orientation tuning.
In contrast to previous studies, stimuli in the present study were cropped to remove hair, neck, ear, and background information that might detract from facial expression processing.
In some studies, stimuli that increase ErbB1 phosphorylation have been shown to promote axon outgrowth (Evangelopoulos et al., 2009; Goldshmit et al., 2004; Tsai et al., 2010).
In steady-state evoked potential studies, stimuli have been biased toward M- versus P-pathways with different standing levels of luminance contrast ("pedestals").
For both the Behavioral and fMRI studies, stimuli were randomly intermixed within task runs, and each participant performed either the read task or the regularize task on each stimulus.
These sequences may be used to study stimulus context and history effects in a manner not previously possible.
Topology has been used to study stimulus reconstruction, and the used representation is close in spirit to Hebb's cell assembly [17].
The reasons may reflect the methods used, times studied, stimulus and/or specific cell types.
