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Paradigms

Delay Match to Sample Task

As is shown in the picture, at the beginning of each trial, a fixation cross/dot will be presented for a short time. After that the screen will show some colored squares, and a short delay followed which served as a retention interval. After the delay, a probe will be presented and a response are required to indicate whether the probe matched an item from the memory set.

Free Recall Task

As indicated in the figure, after the fixation point, the screen will show some patch Gabor with different orientation, subjects need to remember the orientation of all the Gabor and after a delay, they are supposed to recall the orientation by clicking the gray circle at a specific point which represent the orientation of the remembered Gabor.

Tech

Eye-tracker

The laboratory uses EyeLink 1000 Plus in the study of attention and cognition for measuring eye positions and eye movement, aiming to confirm central fixation or replay the trajectory of eye movement during periods of interest.

This device captures the reflected infrared from an eye in real time to measure the motion of the eye relative to the head,
taking the corneal reflection and the center of the pupil as features. We usually use indicators like fixation accuracy, saccade accuracy and pupil size
to understand the physiological mechanisms underlying the specific cognitive processes.

EEG

Our platform of Electro-encephalography (EEG) includes BP BrainAmp 32, BP BrainAmp 64, BrainAmp MR 64, and Neuracle EEG data collection systems.

We use event-related potentials (ERPs) to investigate the patterned voltage changes embedded in the ongoing EEG that reflect a process in response to a particular event: e.g., visual stimuli. In this way, we aim to investigatet the neural mechanisms underlying human memory and attention, and other advanced cognitive function like emotion and decision-making.

TMS

The laboratory uses noninvasive Transcranial magnetic stimulation (TMS) in the study of perception and cognition involves enhancing or disrupting behavior, aiming to map cortical
regions to these behavioral functions.

TMS allows noninvasive stimulation of the brain through externally applied magnetics (TMS). We aim to understand how information related to
perceptual and cognitive processes is represented by specific neural networks.

fMRI

Magnetic resonance imaging (MRI) uses strong magnetic fields to create images of biological tissue. Most fMRI studies measure changes in blood oxygenation over time. Because blood oxygenation levels change rapidly following the activity of neurons in a brain region, fMRI allows researchers to localize brain activity on a second-by-second basis, and within millimeters of its origin.