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Study Finds up to 9% of Psilocybin, LSD Experiences Result in Flashbacks

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New research published in the journal Psychopharmacology further explores psychedelic flashbacks from LSD and psilocybin.

Those who have used psilocybin or LSD may be familiar with the experience: The day following your trip, it’s back to reality, yet there are still glimmers of your previous day’s journey, a fleeting visual cue borrowing from the more intense hallucinogenic effects you just experienced.

These spontaneously recurring, drug-like effects following hallucinogenic exposure are referred to as flashback phenomena; symptoms can include vision changes, mood changes and derealization/depersonalization. Those with persistent recurring flashbacks causing significant distress or impairment may have hallucinogen persisting perception disorder (HPPD), which is considered extremely rare.

New research published in the journal Psychopharmacology further explores psychedelic flashbacks, with results from six placebo-controlled studies revealing that the phenomena occurred for up to 9.2% of participants after LSD or psilocybin exposure.

The authors note that data and current knowledge on both flashbacks and HPPD is “very limited,” even though they are assumed to be among “the most relevant side effects of hallucinogenic drugs.” For the study, researchers analyzed data pulled from multiple clinical trials in order to better describe flashback phenomena and HPPD.

Researchers used data from six double-blinded, placebo-controlled studies with a total of 142 participants aged 25 to 65. In total, 90 participants received LSD, 24 received psilocybin and 28 received both substances. The doses varied depending on the trial; participants received one to five LSD doses ranging from 0.025 and 0.2mg, and/or between one to two doses of psilocybin ranging from 15 to 30mg.

Subjects were asked at each study session to report any adverse events since their last contact with the study team, and any event, including flashbacks, was recorded. All studies also included an end-of-study visit after the last study session, where all subjects were asked for the occurrence of flashback phenomena throughout the entire course of the study. Those who reported flashbacks were asked to describe the phenomenon, specifically the quality, quantity, impairment level and time of occurrence.

Those who reported flashbacks at the end of the study were then conducted via email for follow-up, specifically to assess the occurrence of continued flashbacks of HPPD. Those who reported further flashbacks were again asked to describe them (with the terms of the end-of-study visit) along with any potential triggers to the flashbacks.

During the final study visit, 13 participants (9.2%) described a flashback experience; seven instances occurred after taking LSD, two after psilocybin and four after taking both substances. Most of the flashbacks were visual alterations (for 11 of the 13 participants), and three participants experienced other phenomena (such as auditory/cognitive effects or a feeling of disintegration). Two participants exclusively reported emotional alterations. 

Researchers also noted that flashbacks were limited to the week after the last drug administration in all but two cases.

For most subjects, the flashbacks lasted for seconds (69.2%) to minutes (23.1%), though one case (7.7%) reported alterations persisting for hours. The subject specified that this involved intensified perception of colors and slowed thinking the day following three study sessions. 

For most of these cases (53.8%), the phenomena only occurred once. In two cases (15.4%), symptoms persisted more than five times. One of these subjects reported around 20 visual flashbacks within a short period roughly 24 hours after drug administration. The other subject experienced approximately 30 visual flashbacks within a seven-month period after drug administration. This was the only patient who clearly reported flashbacks after the end-of-study visit. Though, researchers noted that flashbacks lasted just seconds, were experienced as benign and did not impair daily life in both cases. 

More than 50% of participants said the flashbacks occurred while relaxing or shortly before sleep (meaning 1.4% of all 142 subjects reported distressing flashback experiences). While two participants said the flashbacks were experienced as unpleasant, 10 cases said they were neutral or positive. The remaining case was not sufficiently documented.  In all, none of the subjects reported impairment in their daily life due to these symptoms.

Researchers also determined that none of the participants met the criteria for HPPD at any time point, though they noted the rarity of the disorder and the small sample size as factors.

“Drug-like experiences after the administration of LSD and psilocybin seem to be a relatively common phenomenon in clinical trials with healthy participants,” the authors concluded, clarifying that those flashbacks that occurred were mostly benign and didn’t impair daily life. “Overall, our data suggests that flashbacks are not a clinically relevant problem in controlled studies with healthy participants.”

Could honing in on flashback symptoms hold greater potential in a therapeutic setting? While the study reveals new insights that could help to inform further research on the topic, especially as the West continues to embrace psychedelic medicine, there’s still a lot more to uncover.

The study, “Flashback phenomena after administration of LSD and psilocybin in controlled studies with healthy participants,” was authored by Felix Müller, Elias Kraus, Friederike Holze, Anna Becker, Laura Ley, Yasmin Schmid, Patrick Vizeli, Matthias E. Liechti and Stefan Borgwardt.

Source: https://hightimes.com/news/study-finds-up-to-9-of-psilocybin-lsd-experiences-result-in-flashbacks/

Business

EU Pressure Builds on Google as Regulators Face Calls for Massive Fine Over Search Practices

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A growing coalition of European industry groups is intensifying pressure on regulators to take decisive action against Google over allegations of unfair search practices that could reshape competition rules across the region’s digital economy.

Investigation Under Digital Markets Act Gains Momentum

The case is being examined by the European Commission under the European Union’s landmark Digital Markets Act (DMA), introduced to curb the dominance of major technology platforms and ensure fair competition.

Launched in March 2024, the investigation focuses on whether Google has been prioritising its own services in search results, potentially disadvantaging rival businesses that rely on online visibility to reach customers.

Industry Groups Demand Swift Action

Several prominent European organizations have jointly urged regulators to conclude the probe without further delay. They argue that prolonged investigations allow alleged anti-competitive practices to continue, putting European companies—especially startups—at a disadvantage.

Signatories include the European Publishers Council, the European Magazine Media Association, the European Tech Alliance, and EU Travel Tech.

In a joint statement, these groups warned that delays in enforcement are affecting innovation, profitability, and growth prospects for regional businesses competing in digital markets.

Google Denies Allegations

Google has rejected claims of bias, stating that its search algorithms are designed to deliver the most relevant and useful results to users. The company has also proposed adjustments to address regulatory concerns.

However, critics argue that these changes are insufficient and fail to address the core issue of market dominance.

Potential Billion-Euro Penalties

If found in violation of the DMA, Google could face significant financial penalties. Under EU rules, fines can reach a substantial percentage of a company’s global turnover, potentially amounting to billions of euros.

Regulators may also impose corrective measures requiring changes to business practices, which could have long-term implications for how digital platforms operate in Europe.

Wider Implications for Big Tech

The case highlights ongoing tensions between European regulators and major U.S. technology firms. In recent years, the EU has taken a more aggressive stance in enforcing competition laws, aiming to create a level playing field for local businesses.

A final ruling against Google could set a major precedent, influencing future enforcement actions and shaping the regulatory landscape for global tech companies operating within Europe.

As scrutiny intensifies, the outcome of the investigation is expected to play a critical role in defining the future of digital competition across the European Union.

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AI & Technology

Amazon Faces Potential Criminal Trial in Italy Over €1.2 Billion Tax Evasion Allegations

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Milan: U.S. tech giant Amazon is facing the prospect of a major legal showdown in Italy, after prosecutors in Milan formally requested a court to move forward with criminal proceedings over alleged tax evasion totaling approximately ₹12,500 crore (€1.2 billion).

The case targets Amazon’s European division along with four senior executives, marking one of the most significant tax-related investigations involving a global e-commerce platform in Europe.

Trial Push Despite Multi-Million Euro Settlement

The move comes even after Amazon reached a financial settlement with Italian tax authorities in December, agreeing to pay around ₹5,500 crore (€527 million), including interest, to resolve part of the dispute.

Typically, such settlements lead to the closure of criminal investigations. However, Milan prosecutors have opted to proceed, signaling a tougher stance on alleged corporate tax violations.

A preliminary hearing is expected in the coming months, where a judge will decide whether to formally indict the company and its executives or dismiss the case.

Allegations of VAT Evasion Through Marketplace Sellers

At the center of the investigation are claims that Amazon’s platform enabled non-European Union sellers to avoid paying value-added tax (VAT) on goods sold to Italian consumers between 2019 and 2021.

Prosecutors allege that the company’s marketplace structure allowed thousands of foreign vendors—many reportedly based in China—to operate without fully disclosing their identities or tax obligations. This, authorities argue, led to substantial VAT losses for the Italian government.

Under Italian law, online platforms facilitating sales can be held partially liable if third-party sellers fail to comply with tax requirements, a key point in the prosecution’s case.

Italian Government Named as Affected Party

In their filing, prosecutors identified Italy’s Economy Ministry as the injured party, citing significant financial damage resulting from the alleged tax evasion.

Legal experts say the outcome of the case could have wide-ranging implications across the European Union, where VAT systems are harmonized and similar compliance rules apply to digital marketplaces.

Multiple Investigations Add to Pressure

The VAT probe is just one of several legal challenges facing Amazon in Italy. The European Public Prosecutor’s Office is reportedly examining additional tax-related issues covering more recent years.

Meanwhile, Milan authorities are pursuing separate investigations into alleged customs fraud linked to imports from China and whether Amazon maintained an undeclared “permanent establishment” in Italy—potentially exposing it to higher tax liabilities.

In a separate regulatory action, Italy’s data protection authority recently ordered an Amazon unit to stop using personal data from over 1,800 employees at a warehouse near Rome.

Amazon Denies Allegations

Amazon has consistently denied wrongdoing and indicated it will strongly contest the allegations in court if the case proceeds. The company has also warned that prolonged legal uncertainty could impact investor confidence and Italy’s appeal as a destination for international business.

Broader Impact on Europe’s Digital Economy

If the case moves to trial, it could become a landmark moment for the regulation of global e-commerce platforms in Europe. Governments across the region are increasingly scrutinizing how digital marketplaces handle tax compliance, especially in cross-border transactions.

With online retail continuing to expand, regulators are under mounting pressure to ensure that multinational platforms and third-party sellers adhere to the same tax rules as traditional businesses.

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Aviation

IndiGo Crisis Exposes Risks of Monopoly: What If Telecom or E-commerce Collapses Next?

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Airports across India witnessed scenes of distress and confusion as thousands of passengers were stranded due to IndiGo’s massive flight disruptions. Families with medical emergencies, funerals, and personal crises were left helpless as the airline cancelled hundreds of flights without adequate communication or support.

Passengers described desperate situations — a mother pleading for sanitary pads for her daughter, a woman unable to transport her husband’s coffin, and others stranded while trying to reach family funerals or hospitals. “It was like a lockdown at the airport,” one passenger said, describing the panic that unfolded as IndiGo’s mismanagement crippled operations nationwide.

Root Cause: IndiGo’s Market Monopoly

The turmoil, industry experts argue, stems from IndiGo’s monopolistic control over India’s domestic aviation market. The airline operates nearly 2,100 flights daily and holds around 60% market share — meaning every second plane flying within India belongs to IndiGo.

This dominance has given the company unparalleled influence. When IndiGo falters, the entire aviation system suffers. Passengers are left with few alternatives, as other airlines lack capacity to absorb stranded travellers. The result: skyrocketing ticket prices, chaos at terminals, and total dependence on a single private operator.

Aviation pioneer Captain G.R. Gopinath, founder of Air Deccan, criticised the government’s inaction, noting that on some routes, IndiGo’s economy fares surged to ₹1 lakh. He compared the situation to a hostage crisis, writing that the airline “held the system ransom” and forced regulators to defer new safety rules meant to protect pilots and passengers.

Government Intervention and Regulatory Weakness

The crisis erupted after IndiGo failed to comply with the Flight Duty Time Limitations (FDTL) — rules introduced by the DGCA in January 2024 requiring adequate rest for pilots. Despite having nearly two years to adapt, IndiGo blamed the rule for operational disruptions, citing a shortage of pilots.

Under mounting public pressure, the government stepped in, temporarily relaxing FDTL norms and capping airfare hikes. Officials claimed the move was to protect passengers, but analysts say it exposed the state’s vulnerability to corporate monopolies. “The government had no option but to yield,” said one aviation policy expert, pointing out that ignoring safety regulations for short-term relief could have long-term consequences.

The crisis also rekindled memories of the June 2025 Air India crash near London, which claimed over 240 lives. Experts warn that compromising pilot rest and safety standards to maintain flight schedules could risk another tragedy.

If Telecom Giants Fail: A National Paralysis

The article raises a troubling question — what if a similar crisis struck the telecom sector, where Jio and Airtel together control nearly 80% of subscribers and serve over 780 million users?

If both networks failed simultaneously, the repercussions would be catastrophic. Internet shutdowns would halt UPI transactions, online banking, OTP verifications, video calls, OTT streaming, and emergency communications. Critical services such as airports, hospitals, stock exchanges, and small businesses — many of which rely on WhatsApp and digital payments — would come to a standstill.

In essence, a telecom breakdown could paralyse India’s digital economy, exposing the nation’s dependence on a duopoly.

E-commerce Monopoly: Another Fragile Ecosystem

The same risk looms over the e-commerce sector, where Amazon and Flipkart dominate nearly 80% of the market. A disruption similar to IndiGo’s could cripple daily life — halting delivery of groceries, medicines, and essential goods, freezing refunds and customer support, and leaving small sellers without platforms to trade.

Local retailers, freed from competition, might exploit shortages by inflating prices. Such a scenario underscores the perils of market centralisation in sectors critical to everyday living.

A Wake-Up Call for Regulators

The IndiGo crisis, analysts say, is a warning shot for policymakers and regulators. A single company’s operational failure exposed systemic weaknesses in India’s infrastructure and consumer protection mechanisms.

As the aviation regulator DGCA investigates and IndiGo works to restore normalcy, the broader lesson remains clear: unchecked monopoly power in any essential service — whether air travel, telecom, or e-commerce — poses a direct threat to economic stability and citizen welfare.

Without stronger competition laws, redundancy frameworks, and regulatory oversight, India risks repeating this crisis across multiple sectors — each time with millions of citizens paying the price.

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