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Biomedical subjects

L Maras

Publications and source records attributed to L Maras.

8 recordsLinked to original sources
PubMed2003

Verrucous scrotal carcinoma in a patient with hypospadias: is there a possible association?

We report a case of a locally advanced verrucous scrotal cancer in a patient with hypospadias. Surgical excision was performed and no recurrence was noted with 14 months of follow-up. To our knowledge, this association has not been reported. Historically, scrotal carcinoma is occupation related, but none of the occupational predisposing factors was identified in this patient. This observation suggests that hypospadias and secondary chronic inflammation of the scrotal skin, caused by prolonged contact with urine, may contribute to an increased risk of verrucous carcinoma.

Aged↗
PubMed1993

Auditory-evoked responses influenced by presence or absence of EEG alpha activity and actual cognitive state.

The presence or absence of alpha activity in occipital EEG was detected automatically. Auditory-evoked responses (AERs) related to these two brain states and at the same time to different perceptual-cognitive situations (passive listening, discrimination between two tones and pressing the button accordingly similar discrimination without motor reaction) were analyzed and compared statistically. The main result was that during the alpha state (and not during the non-alpha state, when EEG was desynchronized), the amplitudes of N1, P1 waves and peak-to-peak amplitudes N1-P2 were higher during passive listening to stimuli in comparison with the active perceptual-cognitive states mentioned. No differences in latencies of AERs were found.

Adolescent↗
PubMed1992

Perception of timing of movement-onset in a simple reaction time task.

Subjects judged verbally on temporal order between pressing a switch and a marking sound (MS) in a simple reaction time paradigm. They were uncertain when sound preceded movement by less than about 60 ms or followed it by less than 130 ms (transient zone--TZ). The point of subjective equality (defined by 0.5 probability of correct judgements of temporal order of sound and switching onsets) and the median of TZ were shifted about 60 and 35 ms prior movement onset, respectively. Estimating mutual timing of movement preparation and execution and sensory delays, these shifts correspond to the simultaneity of onsets of MS and proprioceptive feedback in the brain. Thus the results suggest about proprioceptive origin of perception of active movement onset.

Adult↗
PubMed1980

Evoked response correlates of letter recognition.

The positive late wave of the average evoked responses induced by tachistoscopic presentation of single letters had a higher amplitude when the letters were correctly recognized than when they were not. The results suggest that the late positive component of VER is a correlate of complex cognitive processes engaged in object’s identification.

Cognition↗