Anterograde interference emerges along a gradient as a function of task similarity: A behavioural study

Area of Science:

• Cognitive Neuroscience
• Motor Learning
• Neuroplasticity

Background:

• Anterograde interference, observed when learning two tasks sequentially, suggests factors beyond competing memories are involved.
• Previous theories proposed memory competition as the primary driver of this interference.
• Neurobiological evidence points to the role of neural network overlap in learning processes.

Purpose of the Study:

• To test the hypothesis that anterograde interference is dependent on the degree of overlap between neural networks used for learning.
• To investigate whether interference is solely due to memory competition or also influenced by neural network properties.

Main Methods:

• A within-subject, counterbalanced design with 24 participants.
• Behavioral manipulation of neural network overlap by altering reach direction and effector during visuomotor adaptation.
• Four experimental conditions varying task similarity and temporal succession (A→A, B→A).

Main Results:

• Anterograde interference occurred similarly in conditions with competing memories (B→A) and without (A→A).
• Interference increased along a gradient with greater task similarity, indicating a role for overlapping neural networks.
• Learning similar tasks resulted in more interference than learning dissimilar tasks.

Conclusions:

• Competing memories are not the sole cause of anterograde interference.
• Overlapping neural networks between successive learning tasks are necessary to trigger interference.
• Dissociating learning-specific neural networks may minimize interference and enhance subsequent learning capabilities.