Conversely, in tasks performed under low cognitive load, even irrelevant information may be admitted at high processing levels (Lavie 1995).
In tasks carried out under high perceptual load, the system's capacity is filled to the limit, eliminating unattended information from the highest processing level.
Then, this information is compared with prior knowledge via a top-down process involving cortical areas at higher processing levels.
Thus, achieving higher parallelism degree implies exploring higher processing levels.
These results not only confirm previous findings showing that semantic information can still be extracted during sleep, but further show that this nonconscious meaning extraction can be routed by the task context and reach higher processing levels, up to motor preparation stages.
Therefore, if left OT plays a role in linking visual to higher processing levels [Devlin et al., 2006; Price and Devlin, 2004; Price and Friston, 2005], demands on this linking process will be more closely matched for words and pictures during naming tasks than perceptual tasks.
The frontal superior and inferior longitudinal tracts connect regions of the frontal lobe involved in decision-making at different levels, from a low-processing level in the posterior frontal regions to a high-processing level in more anterior frontal regions (Badre and D'Esposito 2007; Badre 2008; Christoff et al. 2009).
However, since coarse-to-fine processing has been evidenced with simple stimuli (e.g., Watt 1987; Bredfeldt and Ringach 2002), and complex visual stimuli like natural scenes (e.g., Peyrin et al. 2010), one might speculate that it generalizes to low- and high-processing levels of vision.
Therefore, alternatively, the visual hallucination-like phenomena may be arising as an intrinsic misinterpretation of the induced phosphenes at higher visual processing levels as a result of impaired bottom-up transmission.
Since most algorithms demand high processing times and some level of scene understanding, on the fly processing might be impractical due to battery consumption.
Yet, whether the initial separation of both types of information is maintained at higher language-specific processing levels has to be figured out.
