Do heavy social-media users have weaker brakes on their actions?
Students who used social networking apps excessively responded as accurately as other students on a stop-or-go task, but their brain responses suggested weaker response inhibition and extra attention to social-media logos.
Source
Inhibitory Control in Excessive Social Networking Users: Evidence From an Event-Related Potential-Based Go-Nogo Task
Study at a glance
- Design
- Case-control — Extreme-groups comparison selected from 1,431 valid online questionnaires; both groups did a Go/Nogo task with WeChat/QQ logos and scrambled control images while 64-channel EEG was recorded
- N
- N=43 · 50 students were invited (25 per group); 7 were excluded for unusable ERP data, leaving 23 excessive and 20 non-excessive users
- Population
- University students at Shenzhen University, China, aged about 19-20, screened with an SNS Excessive Use Scale
- Outcome
- Go/Nogo accuracy and reaction times; mean amplitudes of the frontal N1, N2 and central-parietal P3 event-related potentials
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
A large online sample of students completed a social-networking overuse questionnaire (1,431 valid responses), and those scoring at the extremes were invited to an EEG session; 23 excessive and 20 non-excessive users were analysed. In a Go/Nogo task they pressed a key for frequent 'Go' images and withheld the response for rare 'Nogo' images, with WeChat and QQ logos serving as Go targets in one block and scrambled versions of the logos in the other. The researchers compared accuracy, reaction times and three brain-wave components: N1 (early attention), N2 (conflict detection) and P3 (inhibition).
What they found
The groups did not differ in accuracy or reaction time, although everyone responded faster to the social-media logos. Excessive users had larger N2 amplitudes overall (-2.54 versus -0.66 microvolts) and smaller P3 amplitudes on Nogo trials (12.60 versus 15.78 microvolts), regardless of image type. Only excessive users showed a larger early N1 to social-media logos than to control images, which the authors read as heightened early attention to those cues.
The limits
What it doesn't show
The groups did not differ in behaviour, so any 'impaired inhibition' is inferred from ERP amplitudes alone, and the predicted group-by-cue interactions for N2 and P3 were not found. Groups were defined by a self-report questionnaire, and the reported cut-offs and group scores (for example a control mean of 4.4) sit oddly with a 10-item scale scored 1-5, which raises questions about how groups were formed. With about 20 people per group, only two social-media logos as stimuli, and a cross-sectional design, the study cannot tell whether heavy use weakens inhibition or weaker inhibition leads to heavy use, as the authors note.
Key terms
- Go/Nogo task
- A task in which participants respond quickly to frequent 'Go' stimuli but must withhold responses to rare 'Nogo' stimuli, used to measure response inhibition.
- Event-related potential (ERP)
- An averaged EEG voltage change time-locked to a stimulus, giving millisecond-level information about processing stages.
- Nogo-N2
- A frontal negative wave about 200-400 ms after a Nogo stimulus, linked to detecting conflict between responding and stopping.
- Nogo-P3
- A later positive wave about 300-600 ms after a Nogo stimulus, linked to actually inhibiting the motor response.
- Cue reactivity
- Heightened attention or arousal in response to cues associated with an addictive behaviour, such as app logos for heavy users.
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Quiz yourself
What did the behavioural results of the Go/Nogo task show?
Common questions
If behaviour did not differ, why do the authors talk about impaired inhibition?
They base it on the smaller Nogo-P3 in excessive users, which in other addiction research is taken as a marker of weaker inhibition. Brain differences without behavioural differences are suggestive but not conclusive.
Is excessive social networking an addiction?
This study does not settle that. It shows some ERP patterns similar to those reported in substance users, but groups were based on a questionnaire and the effects were modest.
Why were scrambled logos used as control images?
Cutting the logos into pieces and rearranging them kept colours and low-level visual features similar, so differences could be attributed to the meaning of the logos.
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