Foveated near-eye display for mixed reality using liquid crystal photonics

Foveated near-eye display is one of the most promising approaches to deliver immersive experience of mixed reality. However, it is challenged to conceive a compact optical system. Here, we introduce a method to use polarization optics via liquid crystal photonics to improve the foveated display performance. We demonstrate a benchtop prototype of this idea. We implement and combine two display modules for peripheral and foveal visions. A peripheral display consists of a polarization selective lens (PSL) module, a polarization selective diffuser (PSD), and a slanted projection system. An 80$$^\circ$$ ∘ diagonal field of view is achieved by on-axis optical configuration of the PSL module and the PSD. A foveal holographic display is composed of a spatial light modulator (SLM), a volume grating lens, and a microelectromechanical system mirror possibly in combination with a switchable polarization selective grating module. The holographic reconstruction using the SLM enables accurate focus cue generation and high resolution above 30 cycles per degree within 15$$^\circ$$ ∘ by 15$$^\circ$$ ∘ field of view. We explore and discuss the liquid crystal photonics in the prototype that has a novel optical design using volume gratings with polarization selectivity.

Self-Generated Memory Cues: Effective Tools for Learning, Training, and Remembering

People generate a variety of memory cues, such as mnemonic devices and to-do lists, to support memory for difficult information. Self-generated memory cues make difficult information understandable, create links to long-term memory, and ultimately support later retrieval. The primary challenge is generating a cue that is memorable across environmental and mental contexts. Yet, self-generated cues are more effective at supporting retrieval than normative (generic) cues because they are tied to personal experiences, distinctive, and strongly associated to the target information. The effectiveness of self-generated cues can be improved by training people in cue generation, by instructing people to generate stable cues, by combining cue generation with other beneficial strategies, and by using technology to support the creation and memory of the cues. People use their privileged access to their mental states and prior knowledge to flexibly generate memory cues that bolster their memory—useful for students, trainees, elders, and everyone else.

Lexical Access in L2 Speech Production: a controlled serial search task

When it comes to lexical access in L2 speech production, working memory (WM) seems to play a central role as for less automatized procedures require more WM capacity to be executed (Prebianca, 2007). With that in mind, this paper aims at claiming that bilingual lexical access qualifies as a controlled serial strategic search task susceptible to individual differences in WM capacity. Evidence in support of such claim is provided by the results of AUTHOR's (2010) study conducted so as to investigate the relationship between L2 lexical access, WMC and L2 proficiency. AUTHOR's (2010) findings indicate that bilingual lexical access entails underlying processes such as cue generation, set delimitation, serial search and monitoring, which to be carried out, require the allocation of attention. Attention is limited and, as a result, only higher spans were able to perform these underlying processes automatically.