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PubMed1992

Some examples of psychophysiology and the unconscious.

Different sources of the unconscious are discussed and illustrated, namely, failure to have learned an appropriate perception, repression motivated by an aversive emotion and reinforced by the reduction produced in it when the person stops the thoughts or other cue-producing responses eliciting that emotion, an interference with thoughts or perceptions by a distraction or stimulus overload, and failure to perceive a correct cause-and-effect relationship. The ways in which each of these forms of unconsciousness can reduce the adaptiveness of behavior are described and illustrated as well as how psychophysiological recording can facilitate therapy to improve consciousness and thus voluntary control and behavior that is more intelligent and adaptive.

Amnesia↗
PubMed2006

Right hemispheric dominance in processing of unconscious negative emotion.

Right hemispheric dominance in unconscious emotional processing has been suggested, but remains controversial. This issue was investigated using the subliminal affective priming paradigm combined with unilateral visual presentation in 40 normal subjects. In either left or right visual fields, angry facial expressions, happy facial expressions, or plain gray images were briefly presented as negative, positive, and control primes, followed by a mosaic mask. Then nonsense target ideographs were presented, and the subjects evaluated their partiality toward the targets. When the stimuli were presented in the left, but not the right, visual fields, the negative primes reduced the subjects' liking for the targets, relative to the case of the positive or control primes. These results provided behavioral evidence supporting the hypothesis that the right hemisphere is dominant for unconscious negative emotional processing.

Adult↗
PubMed2006

Auditory processing during deep propofol sedation and recovery from unconsciousness.

OBJECTIVE: Using evoked potentials, this study investigated effects of deep propofol sedation, and effects of recovery from unconsciousness, on the processing of auditory information with stimuli suited to elicit a physical MMN, and a (music-syntactic) ERAN. METHODS: Levels of sedation were assessed using the Bispectral Index (BIS) and the Modified Observer's Assessment of Alertness and Sedation Scale (MOAAS). EEG-measurements were performed during wakefulness, deep propofol sedation (MOAAS 2-3, mean BIS=68), and a recovery period. Between deep sedation and recovery period, the infusion rate of propofol was increased to achieve unconsciousness (MOAAS 0-1, mean BIS=35); EEG measurements of recovery period were performed after subjects regained consciousness. RESULTS: During deep sedation, the physical MMN was markedly reduced, but still significant. No ERAN was observed in this level. A clear P3a was elicited during deep sedation by those deviants, which were task-relevant during the awake state. As soon as subjects regained consciousness during the recovery period, a normal MMN was elicited. By contrast, the P3a was absent in the recovery period, and the P3b was markedly reduced. CONCLUSIONS: Results indicate that the auditory sensory memory (as indexed by the physical MMN) is still active, although strongly reduced, during deep sedation (MOAAS 2-3). The presence of the P3a indicates that attention-related processes are still operating during this level. Processes of syntactic analysis appear to be abolished during deep sedation. After propofol-induced anesthesia, the auditory sensory memory appears to operate normal as soon as subjects regain consciousness, whereas the attention-related processes indexed by P3a and P3b are markedly impaired. SIGNIFICANCE: Results inform about effects of sedative drugs on auditory and attention-related mechanisms. The findings are important because these mechanisms are prerequisites for auditory awareness, auditory learning and memory, as well as language perception during anesthesia.

Adult↗
PubMed2006

Unconscious priming according to multiple S-R rules.

The present study investigated if unconscious primes can be processed according to different stimulus-response (S-R) rules simultaneously. Participants performed two different S-R rules, such as judging a digit as smaller or larger than five and judging a letter as vowel or consonant. These S-R rules were administered in random order and announced by a previously presented cue. Each target stimulus was preceded by subliminal primes which afforded a different or an identical response according to either the currently irrelevant or currently relevant S-R rule. In three experiments, we consistently found priming effects according to currently irrelevant S-R rules, even when primes for the relevant and irrelevant S-R rules were presented simultaneously. Thus, unconscious stimuli have the power to activate responses according to currently required and currently not required S-R rules concurrently. The results are in line with response activation accounts of subliminal priming and suggest that at least two routes may gain access on response processes simultaneously.

Adolescent↗
PubMed2004

Is unconscious identity priming lexical or sublexical?

We examined unconscious priming in a stem-completion task with both identity and form-related primes. Participants were given exclusion instructions to avoid completing a stem (e.g., ca---) with a briefly flashed masked word (e.g., candy). In Experiment 1, priming of around 7% occurred for both identity (e.g., candy) and form-based (e.g., windy) primes at a 33 ms exposure duration. When examining only trials in which the participants failed to identify the prime, this effect increased to 12% for identity primes, but remained the same for form-based primes. In Experiment 2, priming without prime identification was 9% for identity primes, 4% for homophone primes, and 3% for orthographic control primes. Although identity priming was greater than form priming in both experiments, regression analyses revealed that orthographic and phonological overlap alone between the flashed primes and targets could completely account for unconscious identity priming. Hence, we conclude that masked words may only activate their sublexical orthographic and phonological representations and not their lexical representations.

Fixation, Ocular↗
PubMed2005

Unconscious manipulation of free choice in humans.

Previous research has shown that subliminally presented stimuli accelerate or delay responses afforded by supraliminally presented stimuli. Our experiments extend these findings by showing that unconscious stimuli even affect free choices between responses. Thus, actions that are phenomenally experienced as freely chosen are influenced without the actor becoming aware of the manipulation. However, the unconscious influence is limited to a response bias, as participants chose the primed response only in up to 60% of the trials. LRP data in free choice trials indicate that the prime was not ineffective in trials in which participants chose the non-primed response as then it delayed performance of the incongruently primed response.

Adult↗
PubMed2006

Are "implicit" attitudes unconscious?

A widespread assumption in recent research on attitudes is that self-reported (explicit) evaluations reflect conscious attitudes, whereas indirectly assessed (implicit) evaluations reflect unconscious attitudes. The present article reviews the available evidence regarding unconscious features of indirectly assessed "implicit" attitudes. Distinguishing between three different aspects of attitudes, we conclude that (a) people sometimes lack conscious awareness of the origin of their attitudes, but that lack of source awareness is not a distinguishing feature of indirectly assessed versus self-reported attitudes, (b) there is no evidence that people lack conscious awareness of indirectly assessed attitudes per se, and (c) there is evidence showing that, under some conditions, indirectly assessed (but not self-reported) attitudes influence other psychological processes outside of conscious awareness. Implications for the concept of "implicit attitudes" are discussed.

Attitude↗
PubMed2006

Unconscious semantic priming in the absence of partial awareness.

In a recent paper in Psychological Science, Kouider and Dupoux reported obtaining unconscious Stroop priming only when subjects had partial awareness of the masked distractor words (i.e., could consciously perceive subword features that enabled reconstruction of whole words). Kouider and Dupoux conjectured that semantic priming occurs only when such partial awareness is present. The present experiments tested this conjecture in an affective categorization priming task that differed from Kouider and Dupoux's in using masked distractors that subjects had practiced earlier as visible words. Experiment 1 showed priming from practiced words when subjects had no partial awareness of those words. Experiment 2 showed that, in the absence of partial awareness, practiced words yielded priming but not-practiced words did not. Experiment 3 corroborated Experiment 1 and 2s results using a different test of partial awareness. These results suggest that unconscious processing (rather than partial awareness) of subword elements drives masked semantic priming by practiced words.

Affect↗
PubMed2006

Unconscious processing embedded in conscious processing: evidence from gaze time on Chinese sentence reading.

The current study aims to separate conscious and unconscious behaviors by employing both online and offline measures while the participants were consciously performing a task. Using an eye-movement tracking paradigm, we observed participants' response patterns for distinguishing within-word-boundary and across-word-boundary reverse errors while reading Chinese sentences (also known as the "word inferiority effect"). The results showed that when the participants consciously detected errors, their gaze time for target words associated with across-word-boundary reverse errors was significantly longer than that for targets words associated with within-word-boundary reverse errors. Surprisingly, the same gaze time pattern was found even when the readers were not consciously aware of the reverse errors. The results were statistically robust, providing converging evidence for the feasibility of our experimental paradigm in decoupling offline behaviors and the online, automatic, and unconscious aspects of cognitive processing in reading.

Analysis of Variance↗
PubMed2006

Unconscious processing of Arabic numerals in unilateral neglect.

This study explores the processing of Arabic numerals in three patients with dense left unilateral neglect. Three tasks have been used: a test of visual awareness (is the stimulus on the left, on the right or on both sides?), a number comparison task (is the number larger or smaller than 5?), a number parity judgment task (is the number odd or even?). The test of visual awareness indicated that all three patients were completely unaware of the stimuli presented in the left hemifield. Despite this, the number comparison and number parity judgment tasks clearly indicated that Arabic numerals were unconsciously processed at semantic level (i.e. quantity). These results show that patients with left unilateral neglect can still semantically process Arabic numerals unconsciously.

Adult↗
PubMed1976

Attacks of ventricular fibrillation and unconsciousness in a patient with prolonged QT interval. A family study.

A syndrome previously recognized by Romano and Ward is characterized by prolonged QT interval on the ECG, and spells of unconsciousness. The case of a patient is reported with successive ECG recordings during the attacks; ventricular flutter and multifocal ventricular tachycardia were noted, with rapid spontaneous recovery and relapse. Cases of stillbirth and sudden death in infancy among the siblings, together with QT interval tachycardia were noted, with rapid spontaneous recovery and relapse. Cases of stillbirth and sudden death ininfancy among the siblings, together with QT interval prolongation in the relatives point to an autosomal dominant transmission, with the propositus being apparently homozygous. The chromosomes of the patient are normal. The attacks were controlled by the association of propranolol and digitalis which seems to be the optimal long-term therapy in such cases. In view of the poor prognosis in untreated cases, and the good results of a correct therapy, an ECG should be recorded at rest and after exercise in all children suffering from spells of unconsciousness.

Adolescent↗
PubMed2001

A functional disconnection between spoken and visual word recognition: evidence from unconscious priming.

The goal of the present study is to assess whether there is an automatic and obligatory activation of the phonological lexicon upon the presentation of a written word under unconscious processing conditions. We use a cross-modal version of the masked repetition priming procedure introduced by Forster and Davis (Journal of Experimental Psychology: Learning, Memory, and Cognition 10 (1984) 680) which consists of priming a spoken word by its written equivalent under masked conditions. These trials are randomly mixed with within-modal (visual-visual) repetition priming control trials. Our results show that cross-modal priming effects are absent unless primes are consciously perceived, as assessed by d' scores obtained with a letter/pseudo discrimination task. In contrast, priming effects within the written modality are observed under conscious as well as unconscious processing conditions. We conclude that the systems underlying written and spoken word processing are, respectively, autonomous and connected only under conscious conditions.

Adult↗
PubMed1993

Unconscious processing in memory recall. A study of three amnesic patients.

The sudden resurgence of precise information some time after the failure of its recall (memory block) suggests the intervention of unconscious processes. In normal subjects the experimental demonstration of such processes meets with methodological snags. They are avoided in patients with a pure amnesic syndrome because retrograde amnesia produces many instances of missing memories, while anterograde amnesia prevents the patient from consciously thinking about it. Three patients with a pure amnesic syndrome were submitted to 4 interviews over 12 days on 3 topics concerning places and itineraries that were very familiar before the disease, and a shocking event of their life. Retrieved memories were compared to those of normal matched subjects. The results showed a dramatic increase for memories of places and itineraries over sessions, and the absence of improvement of autobiographical memories. These findings underline the role of the activation of unconscious processes in recall and the different status of semantic and episodic memory.

Adult↗
PubMedDate not supplied

Further evidence for unconscious learning: preliminary support for the conditioning of facial EMG to subliminal stimuli.

This study investigated the predictive validity of facial electromyograms (EMGs) in a subliminal conditioning paradigm. Two schematic faces (pleasant; CS- and unpleasant; CS+), were presented to eight right-handed males during supraliminal pre- and postconditioning phases. Subliminal conditioning consisted of 36 energy-masked presentations of each face pairing the CS+ with an aversive shock 800 ms poststimulus. A forced-choice recognition task established that the energy mask effectively precluded conscious recognition of stimuli. For the obicularis oculi and corrugator EMGs, significant face x condition interactions were found at 20-100 ms and 400-792 ms poststimulus. The results demonstrate the existence of an expressive motoric response related to affect operating in response to a learned but unconscious event. Subjects were not aware of a contingency between the CS+ and the US, suggesting emotional contingencies can be unconsciously acquired.

Adult↗
PubMed2005

Methods for studying unconscious learning.

One has to face numerous difficulties when trying to establish a dissociation between conscious and unconscious knowledge. In this paper, we review several of these problems as well as the different methodological solutions that have been proposed to address them. We suggest that each of the different methodological solutions offered refers to a different operational definition of consciousness, and present empirical examples of sequence learning studies in which these different procedures were applied to differentiate between implicit and explicit knowledge acquisition. We also show how the use of a sensitive behavioral method, the process dissociation procedure, confers a distinctive advantage in brain-imaging studies when aiming to delineate the neural correlates of conscious and unconscious processes in sequence learning.

Awareness↗
PubMed1979

Myoglobinemia and myoglobinuria in unconscious children.

Myoglobinemia and/or myoglobinuria was demonstrated in 12 of 17 unconscious children studied. Myoglobinemia was noted in patients with serum CPK levels above 200-250 units. Ten of the 12 patients in whom myoglobinemia was present had convulsions. Some degree of renal disturbance was noted in six of seven patients with myoglobinuria. Five patients, including four with renal disturbance, died. In unconscious children with myoglobinuria the possibility of a disturbance of renal function should always be considered.

Blood Urea Nitrogen↗
PubMed2006

The cognitive-affective neuroscience of the unconscious.

There is an ongoing debate about how best to conceptualize the unconscious. Early psychodynamic views employed theories influenced by physics to explain clinical material, while subsequent cognitivist views relied on computational models of the mind to explain laboratory data. More recently, advances in cognitive-affective neuroscience have provided new insights into the workings of unconscious cognition and affect. We briefly review some of this recent work and its clinical implications.

Adult↗
PubMed2004

Priming unconscious racial stereotypes about adolescent offenders.

Two studies examined unconscious racial stereotypes of decision makers in the juvenile justice system. Police officers (Experiment 1) and juvenile probation officers (Experiment 2) were subliminally exposed to words related to the category Black or to words neutral with respect to race. In a presumably unrelated task, officers read 2 vignettes about a hypothetical adolescent who allegedly committed either a property crime (shoplifting from a convenience store) or an interpersonal crime (assaulting a peer). The race of the offender was left unstated and the scenarios were ambiguous about the causes of the crime. Respondents rated the hypothetical offender on a number of traits (e.g., hostility and immaturity) and made judgments about culpability, expected recidivism, and deserved punishment. They also completed a self-report measure of conscious attitudes about race. As hypothesized, officers in the racial prime condition reported more negative trait ratings, greater culpability, and expected recidivism, and they endorsed harsher punishment than did officers in the neutral condition. The effects of the racial primes were not moderated by consciously held attitudes about African Americans. The implications of the findings for racial disparity in the juvenile justice system and for changing unconscious stereotypes were discussed.

Adolescent↗