Conscious visual perception can fail in many circumstances. However, little is known about the causes and processes leading to failures of visual awareness. In this study, we introduce a new signal detection measure termed subjective discriminability of invisibility that allows one to distinguish between subjective blindness due to reduction of sensory signals or to lack of attentional access to sensory signals. The SDI is computed based upon subjective confidence in reporting the absence of a target . Using this new measure, (...) we found that target misses were subjectively indistinguishable from physical absence when contrast reduction, backward masking and flash suppression were used, whereas confidence was appropriately modulated when dual task, attentional blink and spatial uncertainty methods were employed. These results show that failure of visual perception can be identified as either a result of perceptual or attentional blindness depending on the circumstances under which visual awareness was impaired. (shrink)

Subliminal perception (SP) is today considered a well-supported theory stating that perception can occur without conscious awareness and have a significant impact on later behaviour and thought. In this article, we first present and discuss different approaches to the study of SP. In doing this, we claim that most approaches are based on a dichotomic measure of awareness. Drawing upon recent advances and discussions in the study of introspection and phenomenological psychology, we argue for both the possibility and necessity of (...) using an elaborated measure of subjective states. In the second part of the article, we present findings where these considerations are implemented in an empirical study. The results and implications are discussed in detail, both with reference to SP, and in relation to the more general problem of using elaborate introspective reports as data in relation to studies of cognition. (shrink)

Cognitive science has wholeheartedly embraced functional brain imaging, but introspective data are still eschewed to the extent that it runs against standard practice to engage in the systematic collection of introspective reports. However, in the case of executive processes associated with prefrontal cortex, imaging has made limited progress, whereas introspective methods have considerable unfulfilled potential. We argue for a re-evaluation of the standard ‘cognitive mapping’ paradigm, emphasizing the use of retrospective reports alongside behavioural and brain imaging techniques. Using all three (...) sources of evidence can compensate for their individual limitations, and so triangulate on higher cognitive processes. (shrink)

As is the case with other concepts about mental affairs, the concept of introspection has many different interpretations. Some seem to consider introspecting a perceptive act and others see it as a thinking activity . For the present purpose, we will claim it as a common understanding in all such theories that introspection presupposes consciousness . States of consciousness, broadly discussed in the philosophical and empirical literature as first order states of consciousness, are states in which a subject is aware (...) of some or other object, thought, or feeling. Introspective states, however, are states in which a subject directs his or her attention towards their own conscious state. According to this understanding which we claim is a widespread one introspection can exist only in conscious subjects, and, furthermore, it is by way of introspection that a subject can learn about having this or that experience. To avoid misunderstandings, we wish to underline that the claim is not that experiencing as such is dependent upon such acts of introspection. On the contrary, we believe that a subject can have all kinds of intero- and exteroceptive experiences, directing attention towards the represented object . It is only when the subject directs attention not towards the object as such but towards the very state of being conscious of the object that he or she is introspective. (shrink)

Traditionally conceived, introspection is a form of nonsensuous perception that allows the mind to scrutinize at least some of its own states while it is experiencing them. The traditional account of introspection has been in disrepute ever since Ryle argued that the very idea of introspection is a logical muddle. Recent critics such as William Lyons, John Searle, and Sydney Shoemaker argue that this disrepute is well-deserved. Three distinct objections to the traditional account of introspection are considered and rejected. It (...) is argued that critics of the traditional account of introspection fail to adequately distinguish potential objects of introspection. Further, it is argued that at least two cognitive states are properly understood as objects of introspection. The conclusions reached suggest that there are sufficient reasons to reconsider ther merits of the traditional account of introspection. (shrink)

Lycan not only uses the numerous arguments against materialism, and functionalist theories of mind in particular, to gain a more detailed positive view of the ..

William Lyons presents an original thesis on introspection as self-interpretation in terms of a culturally influenced model. His work rests on a lucid, careful, and critical examination of the transformations that have occurred over the past century in the concepts and models of introspection in philosophy and psychology. He reviews the history of introspection in the work of Wundt, Boring, and William James, and reactions to it by behaviorists Watson, Lashley, Ryle, and Skinner.

To study whether the distinction between introspective and non-introspective states of mind is an empirical reality or merely a conceptual distinction, we measured event-related potentials elicited in introspective and non-introspective instruction conditions while the observers were trying to detect the presence of a masked stimulus. The ERPs indicated measurable differences related to introspection in both preconscious and conscious processes. Our data support the hypothesis that introspective states empirically differ from non-introspective states.

In a recent article, [Sergent, C. & Dehaene, S. . Is consciousness a gradual phenomenon? Evidence for an all-or-none bifurcation during the attentional blink, Psychological Science, 15, 720–729] claim to give experimental support to the thesis that there is a clear transition between conscious and unconscious perception. This idea is opposed to theoretical arguments that we should think of conscious perception as a continuum of clarity, with e.g., fringe conscious states [Mangan, B. . Sensation’s ghost—the non-sensory “fringe” of consciousness, Psyche, (...) 7, 18]. In the experimental study described in this article, we find support for this opposite notion that we should have a parsimonious account of conscious perception. Our reported finding relates to the hypothesis that there is more than one perceptual threshold [Merikle, P.M., Smilek, D. & Eastwood, J.D. . Perception without awareness: perspectives from cognitive psychology, Cognition, 79, 115–134], but goes further to argue that there are different “levels” of conscious perception. (shrink)

Metacognitive attitudes can affect behavior but do they do so, as Koriat claims, because they enhance voluntary control? This Commentary makes a case for saying that metacognitive consciousness may enhance not control but subjective predictability and may be best studied by examining not just healthy, well-integrated cognizers, but victims of multilevel mental disorders.

Introspective reports are used as sources of information about other minds, in both everyday life and science. Many scientists and philosophers consider this practice unjustified, while others have made the untestable assumption that introspection is a truthful method of private observation. I argue that neither skepticism nor faith concerning introspective reports are warranted. As an alternative, I consider our everyday, commonsensical reliance on each other’s introspective reports. When we hear people talk about their minds, we neither refuse to learn from (...) nor blindly accept what they say. Sometimes we accept what we are told, other times we reject it, and still other times we take the report, revise it in light of what we believe, then accept the modified version. Whatever we do, we have (implicit) reasons for it. In developing a sound methodology for the scientific use of introspective reports, we can take our commonsense treatment of introspective reports and make it more explicit and rigorous. We can discover what to infer from introspective reports in a way similar to how we do it every day, but with extra knowledge, methodological care, and precision. Sorting out the use of introspective reports as sources of data is going to be a painstaking, piecemeal task, but it promises to enhance our science of the mind and brain. (shrink)

In this rejoinder we clarify several issues raised by the commentators with the hope of resolving some disagreements. In particular, we address the distinction between information-based and experience-based metacognitive judgments and the idea that memory monitoring may be mediated by direct access to internal representations. We then examine the possibility of unconscious metacognitive processes and expand on the critical role that conscious metacognitive feelings play in mediating between unconscious activations and explicit-controlled action. Finally, several open questions are articulated for further (...) scrutiny. (shrink)

Neuroplasticity is a core feature of the brain throughout the entire life of the individual. And when injury to the adult brain destroys part of the circuitry mediating behaviour and/or conscious experience, neuroplasticity is required to bring about the highest possible degree of post-traumatic functional recovery. But is the brain able to recreate the lost circuitry? Scrutiny of the impressive plasticity seen during development and in the adult brain reveals many similarities -- but also some crucial differences. And studies of (...) the mechanisms of functional recovery demonstrate that even an apparently 'full recovery' of the surface phenomena of behaviour and/or conscious representations is accomplished without a recreation of the lost circuitry. Instead, the post-traumatic process utilizes mechanisms, which have evolved to mediate problem solving in the intact brain. The newly developed REF model suggests how such dynamic reorganizations occur in the intact and injured brain. (shrink)

Aware that the representational thesis is more plausible for the attitudinal than for the phenomenal, Dretske courageously focuses on sensory experience, where progress in our philosophical understanding of the mental has lagged. His view, essentially, is that what makes any mental state what it is is not so much what it's like as what it's about.

What is the best way of assessing the extent to which people are aware of a stimulus? Here, using a masked visual identification task, we compared three measures of subjective awareness: The Perceptual Awareness Scale , through which participants are asked to rate the clarity of their visual experience; confidence ratings , through which participants express their confidence in their identification decisions, and Post-decision wagering , in which participants place a monetary wager on their decisions. We conducted detailed explorations of (...) the relationships between awareness and identification performance, looking to determine which scale best correlates with performance, and whether we can detect performance in the absence of awareness and how the scales differ from each other in terms of revealing such unconscious processing. Based on these findings we discuss whether perceptual awareness should be considered graded or dichotomous. Results showed that PAS showed a much stronger performance-awareness correlation than either CR or PDW, particularly for low stimulus intensities. In general, all scales indicated above-chance performance when participants claimed not to have seen anything. However, such above-chance performance only showed when we also observed a correlation between awareness and performance. Thus PAS seems to be the most exhaustive measure of awareness, and we find support for above-chance performance in the absence of subjective awareness, but such unconscious knowledge only contributes to performance when we observe conscious knowledge as well. Similarities and differences between scales are discussed in the light of consciousness theories and response strategies. (shrink)

: A perceptual theory of introspection is one that treats introspection as a species of perception or as a special case of perception. Additionally, a perceptual theory of introspection is one for which introspection shares at least some of the essential features of perception. However, I will show that there are certain essential features of perception that introspection lacks. Moreover, those features common to perception and introspection are insufficient to distinguish perception from belief. Thus, there is good reason to deny (...) that introspection fits a perceptual model of introspection. (shrink)