@article{NixonvanRijMoketal.2016,
  author    = {Nixon, Jessie S. and van Rij, Jacolien and Mok, Peggy and Baayen, Harald R. and Chen, Yiya},
  title     = {The temporal dynamics of perceptual uncertainty: eye movement evidence from Cantonese segment and tone perception},
  series = {Journal of memory and language},
  volume    = {90},
  journal   = {Journal of memory and language},
  publisher = {Elsevier},
  address   = {San Diego},
  issn      = {0749-596X},
  doi       = {10.1016/j.jml.2016.03.005},
  pages     = {103 -- 125},
  year      = {2016},
  abstract  = {Two visual world eyetracking experiments investigated how acoustic cue value and statistical variance affect perceptual uncertainty during Cantonese consonant (Experiment 1) and tone perception (Experiment 2). Participants heard low- or high-variance acoustic stimuli. Euclidean distance of fixations from target and competitor pictures over time was analysed using Generalised Additive Mixed Modelling. Distance of fixations from target and competitor pictures varied as a function of acoustic cue, providing evidence for gradient, nonlinear sensitivity to cue values. Moreover, cue value effects significantly interacted with statistical variance, indicating that the cue distribution directly affects perceptual uncertainty. Interestingly, the time course of effects differed between target distance and competitor distance models. The pattern of effects over time suggests a global strategy in response to the level of uncertainty: as uncertainty increases, verification looks increase accordingly. Low variance generally creates less uncertainty, but can lead to greater uncertainty in the face of unexpected speech tokens. (C) 2016 Elsevier Inc. All rights reserved.},
  language  = {en}
}
@article{MeixnerNixonLaubrock2022,
  author    = {Meixner, Johannes M. and Nixon, Jessie S. and Laubrock, Jochen},
  title     = {The perceptual span is dynamically adjusted in response to foveal load by beginning readers},
  series = {Journal of experimental psychology : general},
  volume    = {151},
  journal   = {Journal of experimental psychology : general},
  number    = {6},
  publisher = {American Psychological Association},
  address   = {Washington},
  issn      = {0096-3445},
  doi       = {10.1037/xge0001140},
  pages     = {1219 -- 1232},
  year      = {2022},
  abstract  = {The perceptual span describes the size of the visual field from which information is obtained during a fixation in reading. Its size depends on characteristics of writing system and reader, but-according to the foveal load hypothesis-it is also adjusted dynamically as a function of lexical processing difficulty. Using the moving window paradigm to manipulate the amount of preview, here we directly test whether the perceptual span shrinks as foveal word difficulty increases. We computed the momentary size of the span from word-based eye-movement measures as a function of foveal word frequency, allowing us to separately describe the perceptual span for information affecting spatial saccade targeting and temporal saccade execution. First fixation duration and gaze duration on the upcoming (parafoveal) word N + 1 were significantly shorter when the current (foveal) word N was more frequent. We show that the word frequency effect is modulated by window size. Fixation durations on word N + 1 decreased with high-frequency words N, but only for large windows, that is, when sufficient parafoveal preview was available. This provides strong support for the foveal load hypothesis. To investigate the development of the foveal load effect, we analyzed data from three waves of a longitudinal study on the perceptual span with German children in Grades 1 to 6. Perceptual span adjustment emerged early in development at around second grade and remained stable in later grades. We conclude that the local modulation of the perceptual span indicates a general cognitive process, perhaps an attentional gradient with rapid readjustment.},
  language  = {en}
}