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PubMed2002

Speak, memory, or goodbye, Columbus.

This article describes the vicissitudes in the career of a psychologist who entered graduate school almost immediately after the end of World War II at a time when the standards and definitions of appropriate training in clinical psychology were still being determined. Looking back at the developments in this career, a pattern of interests, unseen at the time, can now be detected. From investigating the influence of the subject-examiner relationship in the testing situation to the experimental study of psychoanalytic propositions, first using the Rorschach test and later by means of subliminal stimulation procedures, one central theme was the uncovering of disguises and hidden motives. A second major theme, much more explicit than the first, was the primacy of data over speculation.

History, 20th Century↗
PubMed2005

In the face of emotions: event-related potentials in supraliminal and subliminal facial expression recognition.

Is facial expression recognition marked by specific event-related potentials (ERPs) effects? Are conscious and unconscious elaborations of emotional facial stimuli qualitatively different processes? In Experiment 1, ERPs elicited by supraliminal stimuli were recorded when 21 participants viewed emotional facial expressions of four emotions and a neutral stimulus. Two ERP components (N2 and P3) were analyzed for their peak amplitude and latency measures. First, emotional face-specificity was observed for the negative deflection N2, whereas P3 was not affected by the content of the stimulus (emotional or neutral). A more posterior distribution of ERPs was found for N2. Moreover, a lateralization effect was revealed for negative (right lateralization) and positive (left lateralization) facial expressions. In Experiment 2 (20 participants), 1-ms subliminal stimulation was carried out. Unaware information processing was revealed to be quite similar to aware information processing for peak amplitude but not for latency. In fact, unconscious stimulation produced a more delayed peak variation than conscious stimulation.

Adult↗
PubMed1975

A clinical application of subliminal psychodynamic activation. On the stimulation of symbiotic fantasies as an adjunct in the treatment of hospitalized schizophrenics.

This study attempted to utilize the subliminal psychodynamic activation method as an aid in the treatment of hospitalized schizophrenics. More specifically, we inbestigated whether the subliminal activation of a fantasy of symbiotic gratification would produce an increment in the degree of improvement that schizophrenics manifested as a result of hospitalization. Forty male patients were seen individually for three weekly sessions over a 6-week period for a fantasy expression task carried out by a psychology graduate student. Both at the beginning and at the end of each session and whenever during the session anxiety was in evidence, the patient was exposed to subliminal stimulation. The patients were divided into two groups equated for intelligence, pathology level, and other pertinent variables. For one group, the tachistoscopically presented stimulus consisted of MOMMY AND I ARE ONE, a verbal message which, in several prior studies, produced a significant reduction in ego impairment within a laboratory session. The other group served as a control, and their stimulus was PEOPLE ARE WALKING. The subjects in each group were subdivided in order to investigate the effects of two other interventions in addition to the subliminal symbiotic stimulation. One of these was aggressive expression consisting of an attempt to elicit specifically aggressive fantasies in the fantasy expression task. The other was self-focuing, designed to strengthen self-boundaries. All patients were blindly assessed for seven measures of ego impairment before and after the intervention period and for the number of rehospitalizations over a 9-month follow-up period. Of the three types of interventions impairment measures. For on of the variables, the symbiotic group showed significantly more improvement than the control group, while for two others the results approached significance. In addition, on an overall measure of ego impairment, there was significantly mor improvement for the symbiotic group than for the control patients.

Aggression↗
PubMed1992

Reinforcement of subliminal flexion reflexes by transcranial magnetic stimulation of motor cortex in subjects with spinal cord injury.

A 20 msec train (500 Hz; 0.1-0.2 msec duration) of percutaneous electrical stimulation (ES) applied to the plantar surface was used to condition muscle responses evoked in tibialis anterior (TA) by transcranial magnetic stimulation of the motor cortex in 8 subjects with traumatic spinal cord injury (SCI). The intensity of conditioning ES was adjusted to just subthreshold for evoking flexion reflexes in TA and was delivered at conditioning-test (C-T) intervals of 15-60 msec prior to cortical stimulation. Four subjects with clinically complete SCI revealed no muscle response to cortical stimulation or following combined subliminal percutaneous ES and cortical stimulation. Four subjects (3 clinically incomplete and 1 complete injury) demonstrated muscle responses with a latency of 70-80 msec time-locked to the percutaneous ES when the conditioning subliminal stimulation was delivered at C-T: 15-40 msec. These responses, resembling suprathreshold flexion reflexes, reflect the convergence of excitatory afferent and cortical inputs and provide evidence of preserved corticospinal innervation to the L4-5 segmental motoneuron or interneuron pools. In 3 of the subjects this preserved corticospinal influence was evident despite absence of motor evoked potentials (MEPs) following cortical stimulation. The effect of the combined electrical and cortical stimulation in yielding suprathreshold flexion reflexes, instead of the facilitated MEPs seen in control subjects, appears to be related to slowed central conduction, prolonged temporal dispersion of the motoneuron facilitation following cortical stimulation and segmental reflex changes associated with disrupted modulation of interneuronal pathways. The results show this conditioning paradigm to be useful in revealing preserved corticospinal innervation in some SCI subjects with absent MEPs.

Adaptation, Physiological↗
PubMed1989

The effect of subliminal oedipal and competitive stimulation on dart throwing: another miss.

Silverman and his associates have reported that subliminal presentation of oedipally relevant competitive stimuli can modify dart-throwing performance in male subjects. This study replicated their paradigm, but also examined the effects on performance of nonoedipal competitive stimuli. Our results failed to support Silverman's. Both types of subliminally presented competitive stimuli failed to have any systematic effect on dart-throwing performance.

Adolescent↗
PubMed1981

The effect of fantasies of merging with a good mother on schizophrenic pathology.

The purpose of this study was to investigate the effect of subliminal symbiotic stimulation alone and in conjunction with an enhancement procedure on the pathology of relatively differentiated and relatively undifferentiated schizophrenics. It was hypothesized that enhancing the positive attributes of the schizophrenic's image of his mother prior to stimulating a fantasy of a symbiotic merger might increase his ability to benefit from the subliminal symbiotic stimulus. This hypothesis was not supported. Differentiated schizophrenics who received both enhancement procedure and the subliminal symbiotic stimulus showed no pathology reduction, whereas differentiated schizophrenics who received only the subliminal symbiotic stimulus manifested significant reductions in both pathological thinking and pathological behavior. Undifferentiated schizophrenics showed no reduction in pathology after the symbiotic stimulus regardless of whether or not they also received the enhancement procedure. An important finding which emerged was that the subliminal enhancement stimulus alone--i.e., without the symbiotic stimulus--resulted in reductions in pathological behavior for both differentiated and undifferentiated schizophrenics. It was concluded that although enhancing the positive attributes of the schizophrenic's maternal representation did not increase his ability to benefit from subliminal symbiotic stimulation, it did reduce pathology in its own right.

Adult↗
PubMed1998

[Temporal illusory conjunction in RSVP tasks: effects of target complexity].

We examined the complexity effects of stimuli and tasks on temporal illusory conjunction in the Rapid Serial Visual Presentation (RSVP) tasks. Subjects were asked to report the partially defined target. We found that error patterns greatly depended on the visual complexity of stimuli. In the case of visually complex stimuli such as Kanji characters consisting of many strokes, pre-target intrusion errors were dominant. In contrast, post-target intrusion errors mainly occurred for visually simple stimuli such as alphabetic letters. Moreover, when target letters were not defined by a specific feature, pre-target intrusion errors were dominant for alphabetic letters. These results were discussed in view of the limited capacity of visual attention.

Adolescent↗
PubMed1990

Characteristics of dorsal horn neurons expressing subliminal responses to sural nerve stimulation.

The present study was designed (1) to characterize the subliminal responses of dorsal horn neurons to stimulation of the sural nerve, and (2) to correlate the type of response to this stimulus with the responses to natural mechanical stimulation of the skin. To accomplish this, intracellular and extracellular recordings were carried out in L6 and L7 dorsal horn neurons in the cat. The excitatory responses of each cell to electrical stimulation of the sural nerve and to mechanical stimulation of the skin were noted. Of 35 dorsal horn cells recorded intracellularly, 11 responded with impulses to sural nerve stimulation, 9 responded with excitatory postsynaptic potentials (EPSPs) but not impulses, and 15 had no excitatory responses to this stimulus. The type of response to sural nerve stimulation was strongly correlated with receptive field modality. Most cells receiving an input from high-threshold cutaneous mechanoreceptors responded with impulses or gave no excitatory response to sural nerve stimulation, whereas most cells that had only low-threshold mechanoreceptor input responded with EPSPs only or gave no response. In cells with only low-threshold (LT) mechanoreceptive input, response to sural nerve stimulation was highly correlated with receptive field locus. Those LT cells with no excitatory responses to sural nerve stimulation had receptive fields confined to the foot and/or toes, whereas those that gave EPSPs had more proximal receptive fields. The possible significance of these data with reference to changes observed after lesions, such as increased response to sural nerve stimulation, increased receptive field size, and somatotopic reorganization, is discussed.

Afferent Pathways↗
PubMed1987

Recombinant human macrophage colony-stimulating factor (M-CSF) requires subliminal concentrations of granulocyte/macrophage (GM)-CSF for optimal stimulation of human macrophage colony formation in vitro.

Human macrophage colony-stimulating factor (M-CSF or CSF-1), either in purified or in recombinant form, is able to generate macrophagic colonies in a murine bone marrow colony assay, but only stimulates small macrophagic colonies of 40-50 cells in a human bone marrow colony assay. We report here that recombinant human granulocytic/macrophage colony stimulating factor (rhGM-CSF) at concentrations in the range of picograms enhances the responsiveness of bone marrow progenitors to M-CSF activity, resulting in an increased number of macrophagic colonies of up to 300 cells. Polyclonal antiserum against M-CSF did not alter colony formation of bone marrow progenitors incubated with GM-CSF at optimal concentration (1-10 ng/ml) for these in vitro assays. Thus, GM-CSF at higher concentrations (nanogram range) can by itself, elicit macrophagic colonies, and at lower concentrations (picogram range) acts to enhance the responsiveness of these progenitors to M-CSF.

Animals↗