tailieunhanh - .Neuroscience of Rule-Guided Behavior Phần 7

Một câu trả lời cho câu hỏi này là lập kế hoạch mục tiêu dựa trên động cơ chỉ là một bước nhỏ nhút nhát thực hiện phản ứng thực tế và do đó liên kết với một nguy cơ cao về hành vi sai lầm. | 276 Task-Switching consciously monitored under the proposed regime of fully engaged voluntary control A possible answer to this question is that target-based motor planning is only a small step shy of actual response execution and is therefore associated with a high risk of erroneous behavior. In contrast cue-based preparatory processes are relatively far removed from the final execution of motor responses at least in the way in which these cue-based processes have been operationalized in the laboratory . Such reasoning naturally relates to theoretical concepts developed in the context of error processing and performance monitoring that point to the central role played by medial frontal cortex Ridderinkhof et al. 2004 . Not surprisingly this is the same region whose activation pattern we found to be reflective of whether a given participant was engaging in target-based preparatory motor planning discussed earlier . The specific contribution of medial frontal cortex in the context of target-based preparation seems to be to compute and represent the expected outcome or utility in terms of benefits speeding response time and costs extra effort potential response competition in incongruent trials when engaging in concrete preparatory motor planning. Depending on subjective evaluation criteria which we postulate to be computed in medial frontal cortex an individual may or may not feel motivated to engage in advance motor planning. Semiautomatic Control Mode during Cue-Based Preparation What is the reasoning behind the notion of semiautomatic voluntary control operating during cue-based preparation The rationale is that the preparatory benefit associated with advance task cues may rely on processes that subconsciously operate on task-related representations. Yet whether such processes can unfold may depend on the status of a voluntarily controlled initiating signal. Thus in the self-paced situation participants would be able to consciously indicate whether they started .