Parietal alpha-based inhibitory abilities are causally linked to numerosity discrimination

Area of Science:

• Cognitive Neuroscience
• Neuroscience
• Psychology

Background:

• Numerosity processing involves understanding and manipulating quantities.
• Inhibitory skills are crucial for cognitive tasks and linked to alpha brain oscillations.
• The causal relationship between inhibitory skills and numerosity processing remains unclear.

Purpose of the Study:

• To investigate the causal role of inhibitory skills in numerosity discrimination.
• To determine if alpha brain oscillations are critical for these inhibitory abilities.
• To examine the impact of alpha-based brain stimulation on numerosity processing.

Main Methods:

• Employed transcranial alternating current stimulation (tACS) targeting the parietal lobe in 29 young adults.
• Applied alpha (10 Hz), theta (4 Hz), beta (22 Hz), and sham tACS to the parietal regions.
• Utilized a numerosity discrimination paradigm with congruent and incongruent trials.

Main Results:

• Bilateral parietal alpha-tACS significantly impaired performance on incongruent numerosity trials compared to sham and other conditions.
• No significant performance changes were observed with parietal theta/beta tACS or frontal alpha-tACS.
• Performance on congruent numerosity trials remained unaffected across all stimulation conditions.

Conclusions:

• Parietal alpha oscillations are causally linked to inhibitory abilities essential for numerosity discrimination.
• Alpha brainwave stimulation can selectively disrupt cognitive functions reliant on inhibition.
• These findings reinforce the intrinsic role of inhibitory control in numerical cognition.