1. In a computerized meta-attention trainer, a computerized training method for enhancing meta-attention of a user, the method comprising: presenting a user with a cognitive task via a user interface of a computerized meta-attention trainer, wherein the cognitive task includes a stimuli and the task specifies a desired response to the stimuli; assessing attentional control of the user in relation to the cognitive task via the user interface of the computerized meta-attention trainer; providing at least one of an instruction and a feedback via the user interface of the computerized meta-attention trainer, based on the attentional control assessment, to the user, thereby enabling the user to reflect on the meta-attention of the user; and wherein the stimuli is presented at a plurality of random inter-stimulus intervals (ISI), and wherein the random inter-stimulus intervals are substantially between a reaction-reset interval and an attention-sustaining interval, thereby improving the user's meta-attention including knowledge of factors that influence the user's attention and an awareness of the user's attentional processes as they occur and improving the user's attentional control.