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                                                                            If true, this interpretation is an important insight into attentional processing, but this conclusion remains uncertain because blocking and several related phenomena can be explained by models of conditioning that do not invoke attention. [34] Divided attention [ edit ] Attention is a limited resource and is not an all-or-nothing response:  the more attention devoted to one aspect of the environment, the less is available for others. [35] A number of experiments have studied this in...