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Design and Use of an Apparatus for Presenting Graspable Objects in 3D Workspace

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Object size modulates fronto-parietal activity during reaching movements.

Vincenza Tarantino¹, Teresa De Sanctis, Elisa Straulino

¹Dipartimento di Psicologia Generale, Università di Padova, Via Venezia 8, 35131, Padova, Italy.

The European Journal of Neuroscience

|March 6, 2014

Summary

Human brain activity during reaching movements is influenced by object size. Neural signals in the posterior parietal and premotor cortices adapt based on size-related precision demands, impacting movement planning and execution.

Keywords:

event-related potentials human kinematics object size reaching visuo-motor integration

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Area of Science:

Neuroscience
Motor Control
Cognitive Neuroscience

Background:

Reaching movements involve a fronto-parietal network in both humans and monkeys.
Some neurons in this network encode movement direction and are modulated by object features like size.
It remains unclear if human reaching-related areas show similar size-based modulation.

Purpose of the Study:

To investigate whether object size modulates neural activity in human reaching-related areas.
To determine if the brain adjusts reach planning and execution based on object size and associated precision requirements.

Main Methods:

Participants performed reaching movements towards objects of different sizes (small vs. large).
Kinematic data (movement trajectories) and electroencephalographic (EEG) signals were recorded.
Analysis focused on neural activity in posterior parietal and premotor cortices.

Main Results:

Behavioral analysis revealed that movement kinematics were adjusted based on object size and precision demands.
Neural activity in the posterior parietal and premotor cortices showed modulation correlated with object size and accuracy requirements.
This suggests object size influences sensorimotor transformations during reaching.

Conclusions:

Object size is a significant factor in the neural computations underlying reach planning and execution in humans.
Findings align with neurophysiological evidence from non-human primates, indicating conserved mechanisms.
The study highlights the role of object properties in sensorimotor control.