Mood and spatial memory: emotion and right hemisphere contribution to spatial cognition.

Area of Science:

• Cognitive Neuroscience
• Neuropsychology
• Psychophysiology

Background:

• Depression is linked to impaired spatial cognition, potentially due to affective arousal influencing right hemisphere functions.
• Understanding the relationship between mood, arousal, and spatial memory in healthy individuals is crucial for further research.

Purpose of the Study:

• To investigate the influence of individual differences in mood and arousal on spatial memory performance in healthy university students.
• To explore the neural correlates of spatial memory using event-related brain potentials (ERPs) and their modulation by task difficulty and affective state.

Main Methods:

• Participants completed a spatial memory task with varying difficulty levels.
• Event-related brain potentials (ERPs) were recorded using a 64-channel sensor array.
• Individual mood and arousal levels were assessed to correlate with task performance and ERP measures.

Main Results:

• A left visual field advantage confirmed right hemisphere specialization for the spatial memory task, which increased with task difficulty.
• Contralateral processing negativity in the P300 interval (300-500 ms) was observed and intensified with greater task difficulty.
• Subjects with high negative arousal showed a reduced right hemisphere (left field) advantage, suggesting mood-related modulation of spatial processing.
• A medial frontal negativity was associated with "bad" targets and feedback, potentially reflecting error monitoring or motivational salience.

Conclusions:

• Spatial memory performance and its underlying neural mechanisms are sensitive to individual differences in mood and arousal levels.
• Right hemisphere function in spatial memory may be modulated by affective states, particularly negative arousal.
• Frontal brain activity appears responsive to negative feedback and motivational factors during cognitive tasks.