Each test run began at a highly visible stimulus increment and thresholds were tracked using a 3-down, 1-up staircase (contrast was reduced after three correct responses and increased after a single error) yielding a 79% correct threshold level.
A visible light stimulus is electromagnetic radiation that can be perceived visually by an organism; for organisms lacking a visual system, this can be defined as light with a wavelength within the range 380 to 780 nm.
The Mondrian mask appeared over the whole background rectangle frame with the exception of the visible stimulus part (see Fig. 1B).
Our multivoxel pattern classification analysis (MVPA) (Norman et al. 2006) approach focused on nodes in the language network (Fedorenko et al. 2010) identified by an independent localizer using visible stimuli.
Thus, successful discrimination of invisible stimuli was not just a direct consequence of a strong level of activation for visible stimuli (Smith et al. 2011; Tong et al. 2012), but might also reflect regional specialization in the absence of aware processing.
The cone photoreceptor's outer segment (OS) experiences changes in optical path length, both in response to visible stimuli and as a matter of its daily course of renewal and shedding.
Specifically, people focused more attention on the task in response to clearly visible stimuli only after they had been exposed to a clearly visible reward cue, as evidenced by an increased P3-amplitudein response to task-relevant stimuli [ Capa et al., 2013].
Learning was associated with a change in V1 activity, as part of a temporo-occipital and basal ganglia network, which is at variance with the cortico-cerebellar network identified in prior studies of "implicit" sequence learning that involved motor responses and visible stimuli (e.g., [4]).
In Fig. 8 are examples of the SWIR and visible stimuli used in the current paper.
