Spatial-temporal interactions in the human brain.

Area of Science:

• Cognitive Neuroscience
• Psychophysics
• Neuroimaging

Background:

• Understanding the brain's processing of 'where' and 'when' is crucial for cognitive science.
• Existing research suggests distinct mechanisms for processing short and long time intervals.
• The neural basis for integrating spatial and temporal information remains an active area of investigation.

Purpose of the Study:

• To summarize current evidence on the cognitive mechanisms underlying the integration of spatial and temporal representations.
• To identify common brain structures involved in processing the spatial and temporal aspects of stimuli.
• To elucidate how the brain constructs a sense of time and space.

Main Methods:

• Review of psychophysical experiments investigating time perception.
• Analysis of neuroimaging studies (e.g., fMRI, EEG) examining brain activity during spatial and temporal tasks.
• Examination of neuropsychological findings from patients with brain lesions.

Main Results:

• Sub-second time intervals show spatially localized distortions, indicating spatially selective neural timing mechanisms.
• Supra-second intervals may be represented on a left-to-right mental time-line, analogous to number representation.
• The posterior parietal cortex is consistently implicated as a critical convergence zone for spatial and temporal information.

Conclusions:

• The brain employs distinct neural mechanisms for processing different time scales.
• Spatial and temporal information are integrated within specific brain regions, notably the posterior parietal cortex.
• This integration is fundamental for coherent perception and interaction with the environment.