In the current study, group-level and single-subject analyses examined the extent to which the brain regions implicated in difficult semantic judgements also responded to the requirement to retrieve action as opposed to visual features.
Given this controversy, perhaps the most significant finding to emerge from the current study was the overlap between the regions implicated in executive semantic judgements and retrieving actions (as opposed to visual features).
They can see the broad scope of the area they are in, while still focusing in on what precise information they need to retrieve & actions they need to pursue.
A number of brain areas contributed to recollection generally, whether this involved retrieving the actions performed with real objects or the location from which the objects were drawn.
Given that hippocampal activity patterns under these conditions cannot be purely stimulus-driven, we asked whether they might instead reflect categorical decisions (e.g., that the stimulus looks "A-like") or retrieved motor actions (e.g., right button press).
If retrieved motor actions drive the ability of the classifier to decode participants' decisions in relation to 100% scenes, one would predict that a classifier trained on 100% morphs would perform similarly when tested on 50% trials.
Given that participants were performing a decision task, a key question, however, is whether these patterns of activity comprise neural representations of the currently viewed scene (i.e., scene A), or instead retrieved motor actions (e.g., right button press).
These parietal areas are important in action related processing as evident by their activation when participants retrieve and/or execute actions [3], [12] [15], or when participants passively observe the action of man-made objects [46].
Representations of actions and events must be flexibly controlled to suit the context or task – for example, we can retrieve very different actions for the object 'shoe' if the task is to bang in tent pegs rather than fasten our laces.
Associative memory (the ability to learn, store, and retrieve associations between actions or things) also declines dramatically.
Number of operations AME-SAD Quadtree- Uniform- MRMEH construction (no. of pixels retrieved) — 191451.43 327680 Action recognition (no. of bins compared) 458752 1458752 511458752
