Neural correlates of visual localization and perisaccadic mislocalization.

Area of Science:

• Neuroscience
• Cognitive Science
• Vision Science

Background:

• The brain constructs a stable visual world despite rapid eye movements (saccades).
• Perceptual distortions occur during these saccadic eye movements, a phenomenon known as perisaccadic distortion.
• Previous assumptions suggested retinal position signals are veridical (accurate) during saccades.

Purpose of the Study:

• To investigate the neural basis of perisaccadic spatial distortions.
• To determine if neural representations of retinal position are distorted during saccades.
• To compare the timing and extent of neural distortions with human psychophysical findings.

Main Methods:

• Electrophysiological recordings from medial temporal (MT) and medial superior temporal (MST) areas in animals.
• Analysis of neuronal responses during fixation and saccadic eye movements.
• Comparison of neural data with psychophysical data on human perisaccadic mislocalization.

Main Results:

• Neurons in MT and MST accurately represent retinal position during fixation.
• During saccades, these same neurons distort the representation of spatial position.
• The observed neural distortion closely matches the magnitude and time course of human perisaccadic mislocalization.

Conclusions:

• Neural representations of retinal position in MT/MST are not veridical during saccades.
• These distorted neural signals likely underlie the perceptual mislocalization observed in humans.
• Challenges the assumption of veridical retinal position signals in psychophysical models of perisaccadic vision.