Visual Attention and Eye Movements

This laboratory studies visual perception with a focus on the interaction between eye
movements and attention. It is well established that attending to a stimulus can profoundly
alter perception. For example, attending to a speaker at a crowded party can almost
completely filter background both in terms of auditory noise and visual distractions.
Although laboratory studies have traditionally investigated the effects of attentional
changes in the absence of eye movements, under natural conditions, visual attention is often
accompanied by orienting movements to direct our head and eyes towards the relevant objects
of interest. Recent work has suggested that these orienting movements affect perception in a
manner similar to covert attention. The proposed studies will investigate how eye movements
contribute to perception and attention.

The research covered by this protocol combines traditional "button-press" psychophysics with
non-invasive eye-tracking to investigate the interaction between eye movements and
perception. Subjects will perform simple perceptual tasks, such as judging the orientation or
direction of a visual stimulus, while their eye position is monitored with a video
eye-tracker. This approach (combining psychophysics and eye-tracking) is flexible, low risk,
and fast when compared with neurophysiological studies. However, by focusing on low-level
perceptual tasks, the results will be interpretable in the context of larger studies of
neurophysiological responses in the visual system.

The investigators hope that this basic research will ultimately have both applied and
clinical significance. For example, understanding how perception is influenced by attention
and eye-movements in neurotypical populations may provide non-invasive and naturalistic ways
to identify and diagnose psychiatric disorders. Additionally, understanding how eye-movements
interact with sensory encoding has the potential to improve machine learning algorithms for
vision and navigation (These are not a part of the current study, but a potential future
impact).

Inclusion Criteria:

- Age between 18-65

- Corrected-to-normal vision

- No known diagnosis of visual or auditory disorder or impairment

Exclusion Criteria:

- Does not have corrected-to-normal vision

- Unable to understand and follow the instructions given of the study

- Known diagnosis of visual or auditory disorder or impairment