How are we to understand the phenomenology of imagining? Attempts to answer this question often invoke descriptors concerning the “vivacity” or “vividness” of our imaginative states. Not only are particular imaginings often phenomenologically compared and contrasted with other imaginings on grounds of how vivid they are, but such imaginings are also often compared and contrasted with perceptions and memories on similar grounds. Yet however natural it may be to use “vividness” and cognate terms in discussions of imagination, it does (...) not take much reflection to see that these terms are ill understood. In this paper, I review both some relevant empirical literature as well as the philosophical literature attempt to get a handle on what it could mean, in an imaginative context, to talk of vividness. As I suggest, this notion ultimately proves to be so problematic as to be philosophically untenable. (shrink)

When we see the way that the parts of the Appendix concerning belief hang together, we can understand how and why Hume moved from saying that belief is a vivid idea to saying that belief is a sui generis feeling. In the Appendix to the Treatise, Hume retracts his claim that perceptions with the same object only vary with respect to vivacity. In material in the appendix that he tells his reader to insert in Book 1, he explains his (...) reasons: the vivacity connected to belief is different in kind from that from the vivacity connected to poetry. Poetry can be more vivid, in its way, than belief. Since Hume’s main arguments for the thesis that beliefs are vivid ideas in the main body of the Treatise depend on the assumption that ideas with the same object only vary in vivacity, he owes us new arguments from his claim. He provides various arguments for a slightly revised thesis that belief is a particular sort of vivid idea at the beginning of the Appendix. (shrink)

A very common view of Hume’s distinction between impressions and ideas is that it is based on their intrinsic properties; specifically, their force and vivacity. Some interpreters have challenged this,one being David Landy (Landy 2006). He argues that for Hume the difference lies instead in the fact that impressions are not copies of anything, while ideas are copies of impressions. I regard this view as unsatisfactory, not because it is fundamentally mistaken but because (to put it in Humean terms) (...) it “…it discovers not all the truth” (Treatise 1.3.7.4). I will argue that Hume was a functionalist about (some)mental kinds, individuating impressions, ideas, and beliefs (and possibly other mental phenomena) in terms of their causal role in our mental economy. The distinction between impressions and ideas involves the fact that ideas are copies and impressions are not, but also more than that. I will also argue that interpreting Hume as a functionalist enables one to make sense of a passage that is impossible to explain on the force-and-vivacity view, and that it does so more readily than Landy’s view.Furthermore, I think this interpretation makes better sense of Hume’s “missing shade of blue” than Landy’s does. (shrink)

The vividness of mental imagery is epistemically relevant. Intuitively, vivid and intense memories are epistemically better than weak and hazy memories, and using a clear and precise mental image in the service of spatial reasoning is epistemically better than using a blurry and imprecise mental image. But how is vividness epistemically relevant? I argue that vividness is higher-order evidence about one’s epistemic state, rather than first-order evidence about the world. More specifically, the vividness of a mental image is higher-order evidence (...) about the amount of first-order information one has about its subject matter. When vividness is sufficiently low, it can give one reason to doubt the epistemic basis of the mental image and thereby act as a defeater. This account has important implications for theorizing about the epistemic roles of memory, imagination, mental imagery, and phenomenal consciousness. (shrink)

ABSTRACT The difference between perception and cognition seems introspectively obvious in many cases. Perceiving and thinking have also been assigned quite different roles, in epistemology, in theories of reference and of mental content, in philosophy of psychology, and elsewhere. Yet what is the nature of the distinction? In what way, or ways, do perception and cognition differ? The paper reviews recent work on these questions. Four main respects in which perception and cognition have been held to differ are discussed. First, (...) their phenomenal character, such as the often-remarked vivacity or immediacy of perception. Second, the way in which they represent the world, e.g. the non-propositional nature of the contents, or non-discursive character of the vehicles, that have been held to characterise perceptual representation. Third, their place in cognitive architecture, i.e., roughly, in the information-flow of the mind, such as their alleged (non-)modularity. Fourth, their mind-world relations, e.g. the way in which perceptions seem to be tightly causally linked with distal or proximal stimuli. Against this background, we distinguish some main options for an account of the perception/cognition distinction, in particular concerning whether there is one, several, or no interesting and principled distinction(s) to be drawn here. (shrink)

Reid’s dilemma concludes that, whether the idea associated with a denied proposition is lively or faint, Hume is committed to saying that it is either believed or merely conceived. In neither case would there be denial. If so, then Hume cannot give an adequate account of denial. I consider and reject Powell’s suggestion that Hume could have advanced a “Content Contrary” account of denial that avoids Reid’s dilemma. However, not only would a Humean Content Contrary account be viciously circular, textual (...) evidence suggests that Hume did not hold such an account. I then argue that Govier’s distinction between force and vivacity cannot help Hume. Not only did Hume fail to recognize this distinction, we can advance a variant of Reid’s dilemma even if we distinguish force from vivacity. (shrink)

David Hume fancied himself the Newton of the mind, aiming to reinvent the study of human mental life in the same way that Newton had revolutionized physics. And it was his view that the novel account of belief he proposed in his Treatise of Human Nature was one of that work’s central philosophical contributions. From the earliest responses to the Treatise forward, however, there was deep pessimism about the prospects for his account. It is easy to understand the source of (...) this pessimism: The constraints he employed in theorizing stem from his Newtonian ambitions. Constraints such as his copy principle and his decision to rely only on variations in “force and vivacity” for differentiating types of mental states severely limit his available explanatory resources. However, it is one thing to regard an account as untenable, and quite another to understand where it fails. In this paper, I focus on one long-standing objection to Hume’s account — the objection that Hume cannot offer an account of negative belief or denial — as presented by Hume’s contemporary Thomas Reid, as well as more recently by Barry Stroud, and defend Hume from this objection. I argue that Hume both should and does endorse an account of negative belief based in relations of contrariety between contents, rather than between mental activities, and survey the different options available to Hume for spelling out an account of contrary contents. (shrink)

Hume introduced important innovations concerning the theory of ideas. The two most important are the distinction between impressions and ideas, and the use he made of the principles of association in explaining mental phenomena. Hume divided the perceptions of the mind into two classes. The members of one class, impressions, he held to have a greater degree of force and vivacity than the members of the other class, ideas. He also supposed that ideas are causally dependent copies of impressions. (...) And, unlike Locke and others, Hume makes positive use of the principle of association, both of the association of ideas, and, in a more limited way, of the association of impressions. Such associations are central to his explanations of causal reasoning, belief, the indirect passions (pride and humility, love and hatred), and sympathy. These views about impressions and ideas and the principles of association form the core of Hume’s science of human nature. Relying on them, he attempts a rigorously empirical investigation of human nature. The resulting system is a remarkable but complex achievement. (shrink)

First described by Galton in 1880 and then remaining unnoticed for a century, recent investigations in neuroscience have shown that a condition called aphantasia appears in certain individuals, which causes them to be unable to experience visual mental imagery. Comparing aphantasia to hyperphantasia – i.e., photo-like memory – and considering the neurological basis of perceptual phenomena, we are revisiting Hume's division of perceptions into impressions and ideas. By showing different vivacities of mental phenomena and comparing them to neurological research, we (...) are stating that not only impressions and ideas differ "in the degrees of force and liveliness", but ideas and impressions amongst themselves as well. Such a gradual range of perceptions and mental images bears significant consequences for not only representational theory and historical interpretations, but linguistics and semiotics as well. (shrink)

"Men have died from time to time, and worms have eaten them, but not for love."Satyajit Ray Wikipedia The Free Encyclopedia 2015 .