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<p><b>Marijuana/Hashish/THC</b>: increased frontal alpha amplitude, with increased frontal coherence across the hemispheres, as well as phase synchrony.&nbsp; These findings are reported in chronic exposures.</p>
<p>Effects on dampening reaction times in evoked potentials have been noted as well.</p>
<h5><span><span style=""><span style=""><span><b>LSD (Lysergic acid diethylamide)</b></span></span>
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    </span>for normal EEGs, decreased alpha and increased beta. For slow EEGs, an increase in alpha amplitude and increase in fast activity.&nbsp;</h5>
<p><b>PCP, Phencyclidine, or angel dust</b>&nbsp;<br><span style="font-size: 1rem;">A marked increase in slow activity, with paroxysmal activity and extreme voltages noted with increased dosage. Convulsions have been reported.</span></p>
<p><b>Morphine/Opiates/Heroin<br></b><span style="font-size: 1rem;">Shortly following administration, there is increased alpha, with slowing of alpha during the euphoric high, with increased dose there is increased slowing, and like barbiturates the EEG may go iso-electric. There is an increase in REM sleep noted with opioids.</span></p>