Интересные цитаты

Executive functions (EFs; also called executive control or cognitive control) refer to a family of top-down mental processes needed when you have to concentrate and pay attention, when going on automatic or relying on instinct or intuition would be ill-advised, insufficient, or impossible (Burgess & Simons 2005, Espy 2004, Miller&Cohen 2001).Using EFs is effortful; it is easier to continue doing what you have been doing than to change, it is easier to give into temptation than to resist it, and it is easier to go on “automatic pilot” than to considerwhat to do next.

Within striatal circuits the neuromodulator dopamine is considered by many  to act as a learning signal, controlling neural plasticity (60). One of the main  lines of evidence has come from recordings of midbrain dopamine neurons  whose axons project to wide regions of forebrain (61)—including the striatum,  which has a very high density of dopamine receptors. In macaque monkeys such  cells often show brief (~0.1 s) increases in firing rate, particularly to unexpected  rewards, or to unexpected cues that signal upcoming rewards (reviewed in  62). The ability of dopamine cells to ignore fully expected rewards and shift  firing to cues that predict rewards has a strong resemblance to “error signals”  in certain formal learning theories (63) and certain computational models of  “reinforcement learning”(64). Both classes of model refer to situations in which  the extent of associative learning is controlled by a simple signal that provides  feedback on the overall success or failure of an action or expectation. Because  the signal does not provide detailed information on the exact nature of any errors  committed, it is sometimes described as a “critic” rather than a “teacher” (65).

There are different perspectives on the self, different possible definitions, and with each perspective and definition, naturally, comes a different explanation. Yet it is likely that something like an essence of self can be uncovered behind the multiplicity of views. In this article I suggest that a neurobiological account can help us find such an essence. The title of this article includes the words “feelings” and “self” because I believe the neural basis of feelings and of self have a shared neurobiological stem.

The notion of a disorder of the self as being a core feature of schizophrenia has existed since the early days of schizophrenia research, but recent work has clarified and specified the type of self-disturbance that may be at play (Chung, 2007; Parnas, 2000; Parnas and Sass, 2001). In order to understand the type of selfdisturbance being referred to in recent phenomenological writings, it is necessary to distinguish between several ‘‘levels’’ or types of selfhood. Parnas (2003) identifies three levels of selfhood from a phenomenological perspective (see Table 1).